<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://www.cae.com/role/AccountsPayableAndAccruedLiabilities" xlink:href="cae-20180331.xsd#AccountsPayableAndAccruedLiabilities" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/AccountsPayableAndAccruedLiabilitiesDetails" xlink:href="cae-20180331.xsd#AccountsPayableAndAccruedLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/AccountsPayableAndAccruedLiabilitiesTables" xlink:href="cae-20180331.xsd#AccountsPayableAndAccruedLiabilitiesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/AccountsReceivable" xlink:href="cae-20180331.xsd#AccountsReceivable" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/AccountsReceivableDetails" xlink:href="cae-20180331.xsd#AccountsReceivableDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/AccountsReceivableTables" xlink:href="cae-20180331.xsd#AccountsReceivableTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/AccumulatedOtherComprehensiveIncome" xlink:href="cae-20180331.xsd#AccumulatedOtherComprehensiveIncome" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/AccumulatedOtherComprehensiveIncomeDetails" xlink:href="cae-20180331.xsd#AccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/AccumulatedOtherComprehensiveIncomeTables" xlink:href="cae-20180331.xsd#AccumulatedOtherComprehensiveIncomeTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/BusinessCombinations" xlink:href="cae-20180331.xsd#BusinessCombinations" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/BusinessCombinationsDetails" xlink:href="cae-20180331.xsd#BusinessCombinationsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/BusinessCombinationsNetAssetsAndLiabilitiesFromAcquisitionDetails" xlink:href="cae-20180331.xsd#BusinessCombinationsNetAssetsAndLiabilitiesFromAcquisitionDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/BusinessCombinationsTables" xlink:href="cae-20180331.xsd#BusinessCombinationsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/CapitalRiskManagement" xlink:href="cae-20180331.xsd#CapitalRiskManagement" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/CapitalRiskManagementDetails" xlink:href="cae-20180331.xsd#CapitalRiskManagementDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/CapitalRiskManagementTables" xlink:href="cae-20180331.xsd#CapitalRiskManagementTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ChangesInAccountingPolicies" xlink:href="cae-20180331.xsd#ChangesInAccountingPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ChangesInAccountingPoliciesDetails" xlink:href="cae-20180331.xsd#ChangesInAccountingPoliciesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ChangesInAccountingPoliciesTables" xlink:href="cae-20180331.xsd#ChangesInAccountingPoliciesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/Commitments" xlink:href="cae-20180331.xsd#Commitments" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/CommitmentsDetails" xlink:href="cae-20180331.xsd#CommitmentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/CommitmentsTables" xlink:href="cae-20180331.xsd#CommitmentsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ConsolidatedIncomeStatement" xlink:href="cae-20180331.xsd#ConsolidatedIncomeStatement" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ConsolidatedStatementOfCashFlowsStatement" xlink:href="cae-20180331.xsd#ConsolidatedStatementOfCashFlowsStatement" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ConsolidatedStatementOfChangesInEquityStatement" xlink:href="cae-20180331.xsd#ConsolidatedStatementOfChangesInEquityStatement" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ConsolidatedStatementOfComprehensiveIncome" xlink:href="cae-20180331.xsd#ConsolidatedStatementOfComprehensiveIncome" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ConsolidatedStatementOfFinancialPosition" xlink:href="cae-20180331.xsd#ConsolidatedStatementOfFinancialPosition" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/Contingencies" xlink:href="cae-20180331.xsd#Contingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ContractsInProgress" xlink:href="cae-20180331.xsd#ContractsInProgress" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ContractsInProgressDetails" xlink:href="cae-20180331.xsd#ContractsInProgressDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ContractsInProgressTables" xlink:href="cae-20180331.xsd#ContractsInProgressTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/DebtFacilities" xlink:href="cae-20180331.xsd#DebtFacilities" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/DebtFacilitiesDetails" xlink:href="cae-20180331.xsd#DebtFacilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/DebtFacilitiesFinancingActivitiesDetails" xlink:href="cae-20180331.xsd#DebtFacilitiesFinancingActivitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/DebtFacilitiesFutureMinimumLeasePaymentsDetails" xlink:href="cae-20180331.xsd#DebtFacilitiesFutureMinimumLeasePaymentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/DebtFacilitiesLongTermDebtDetails" xlink:href="cae-20180331.xsd#DebtFacilitiesLongTermDebtDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/DebtFacilitiesNonRecourseDebtDetails" xlink:href="cae-20180331.xsd#DebtFacilitiesNonRecourseDebtDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/DebtFacilitiesRecourseDebtDetails" xlink:href="cae-20180331.xsd#DebtFacilitiesRecourseDebtDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/DebtFacilitiesRetirementPaymentsDetails" xlink:href="cae-20180331.xsd#DebtFacilitiesRetirementPaymentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/DebtFacilitiesTables" xlink:href="cae-20180331.xsd#DebtFacilitiesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/DeferredGainsAndOtherNonCurrentLiabilities" xlink:href="cae-20180331.xsd#DeferredGainsAndOtherNonCurrentLiabilities" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/DeferredGainsAndOtherNonCurrentLiabilitiesDetails" xlink:href="cae-20180331.xsd#DeferredGainsAndOtherNonCurrentLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/DeferredGainsAndOtherNonCurrentLiabilitiesTables" xlink:href="cae-20180331.xsd#DeferredGainsAndOtherNonCurrentLiabilitiesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/DocumentAndEntityInformation" xlink:href="cae-20180331.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/EmployeeBenefitsObligations" xlink:href="cae-20180331.xsd#EmployeeBenefitsObligations" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/EmployeeBenefitsObligationsDetails" xlink:href="cae-20180331.xsd#EmployeeBenefitsObligationsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/EmployeeBenefitsObligationsEmployeeBenefitObligationDetails" xlink:href="cae-20180331.xsd#EmployeeBenefitsObligationsEmployeeBenefitObligationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/EmployeeBenefitsObligationsExpectedEmployerContributionsDetails" xlink:href="cae-20180331.xsd#EmployeeBenefitsObligationsExpectedEmployerContributionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/EmployeeBenefitsObligationsFutureMortalityRateDetails" xlink:href="cae-20180331.xsd#EmployeeBenefitsObligationsFutureMortalityRateDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/EmployeeBenefitsObligationsMovementInDefinedBenefitPensionObligationDetails" xlink:href="cae-20180331.xsd#EmployeeBenefitsObligationsMovementInDefinedBenefitPensionObligationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/EmployeeBenefitsObligationsNetPeriodicCostsDetails" xlink:href="cae-20180331.xsd#EmployeeBenefitsObligationsNetPeriodicCostsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/EmployeeBenefitsObligationsPlanAssetsDetails" xlink:href="cae-20180331.xsd#EmployeeBenefitsObligationsPlanAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/EmployeeBenefitsObligationsSignificantAssumptionsDetails" xlink:href="cae-20180331.xsd#EmployeeBenefitsObligationsSignificantAssumptionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/EmployeeBenefitsObligationsSignificantAssumptionsWeightedDetails" xlink:href="cae-20180331.xsd#EmployeeBenefitsObligationsSignificantAssumptionsWeightedDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/EmployeeBenefitsObligationsTables" xlink:href="cae-20180331.xsd#EmployeeBenefitsObligationsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/EmployeeCompensation" xlink:href="cae-20180331.xsd#EmployeeCompensation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/EmployeeCompensationDetails" xlink:href="cae-20180331.xsd#EmployeeCompensationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/EmployeeCompensationTables" xlink:href="cae-20180331.xsd#EmployeeCompensationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/FairValueOfFinancialInstruments" xlink:href="cae-20180331.xsd#FairValueOfFinancialInstruments" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/FairValueOfFinancialInstrumentsDetails" xlink:href="cae-20180331.xsd#FairValueOfFinancialInstrumentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/FairValueOfFinancialInstrumentsTables" xlink:href="cae-20180331.xsd#FairValueOfFinancialInstrumentsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/FinanceExpenseNet" xlink:href="cae-20180331.xsd#FinanceExpenseNet" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/FinanceExpenseNetDetails" xlink:href="cae-20180331.xsd#FinanceExpenseNetDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/FinanceExpenseNetTables" xlink:href="cae-20180331.xsd#FinanceExpenseNetTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/FinancialRiskManagement" xlink:href="cae-20180331.xsd#FinancialRiskManagement" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/FinancialRiskManagementDetails" xlink:href="cae-20180331.xsd#FinancialRiskManagementDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/FinancialRiskManagementForwardForeignCurrencyContractsDetails" xlink:href="cae-20180331.xsd#FinancialRiskManagementForwardForeignCurrencyContractsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/FinancialRiskManagementLettersOfCreditAndGuaranteesDetails" xlink:href="cae-20180331.xsd#FinancialRiskManagementLettersOfCreditAndGuaranteesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/FinancialRiskManagementMaturityAnalysisDetails" xlink:href="cae-20180331.xsd#FinancialRiskManagementMaturityAnalysisDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/FinancialRiskManagementNetIncomeAndOtherComprehensiveIncomeDetails" xlink:href="cae-20180331.xsd#FinancialRiskManagementNetIncomeAndOtherComprehensiveIncomeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/FinancialRiskManagementTables" xlink:href="cae-20180331.xsd#FinancialRiskManagementTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/GovernmentParticipation" xlink:href="cae-20180331.xsd#GovernmentParticipation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/GovernmentParticipationAggregateContributionsRecognizedDetails" xlink:href="cae-20180331.xsd#GovernmentParticipationAggregateContributionsRecognizedDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/GovernmentParticipationNarrativeDetails" xlink:href="cae-20180331.xsd#GovernmentParticipationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/GovernmentParticipationNetContributionsRecognizedAndAmountsNotYetReceivedDetails" xlink:href="cae-20180331.xsd#GovernmentParticipationNetContributionsRecognizedAndAmountsNotYetReceivedDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/GovernmentParticipationTables" xlink:href="cae-20180331.xsd#GovernmentParticipationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ImpairmentOfNonfinancialAssets" xlink:href="cae-20180331.xsd#ImpairmentOfNonfinancialAssets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ImpairmentOfNonfinancialAssetsChangesInGoodwillDetails" xlink:href="cae-20180331.xsd#ImpairmentOfNonfinancialAssetsChangesInGoodwillDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ImpairmentOfNonfinancialAssetsDetails" xlink:href="cae-20180331.xsd#ImpairmentOfNonfinancialAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ImpairmentOfNonfinancialAssetsTables" xlink:href="cae-20180331.xsd#ImpairmentOfNonfinancialAssetsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/IncomeTaxes" xlink:href="cae-20180331.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/IncomeTaxesComponentsOfProvisionForIncomeTaxExpenseDetails" xlink:href="cae-20180331.xsd#IncomeTaxesComponentsOfProvisionForIncomeTaxExpenseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/IncomeTaxesDetails" xlink:href="cae-20180331.xsd#IncomeTaxesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/IncomeTaxesMovementsInTemporaryDifferencesDetails" xlink:href="cae-20180331.xsd#IncomeTaxesMovementsInTemporaryDifferencesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/IncomeTaxesNonCapitalLossesDetails" xlink:href="cae-20180331.xsd#IncomeTaxesNonCapitalLossesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/IncomeTaxesReconciliationOfIncomeTaxesDetails" xlink:href="cae-20180331.xsd#IncomeTaxesReconciliationOfIncomeTaxesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/IncomeTaxesTables" xlink:href="cae-20180331.xsd#IncomeTaxesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/IntangibleAssets" xlink:href="cae-20180331.xsd#IntangibleAssets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/IntangibleAssetsDetails" xlink:href="cae-20180331.xsd#IntangibleAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/IntangibleAssetsTables" xlink:href="cae-20180331.xsd#IntangibleAssetsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/Inventories" xlink:href="cae-20180331.xsd#Inventories" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/InventoriesCostOfSalesDetails" xlink:href="cae-20180331.xsd#InventoriesCostOfSalesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/InventoriesDetails" xlink:href="cae-20180331.xsd#InventoriesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/InventoriesTables" xlink:href="cae-20180331.xsd#InventoriesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/NatureOfOperationsAndSummaryOfSignificantAccountingPolicies" xlink:href="cae-20180331.xsd#NatureOfOperationsAndSummaryOfSignificantAccountingPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/NatureOfOperationsAndSummaryOfSignificantAccountingPoliciesDetails" xlink:href="cae-20180331.xsd#NatureOfOperationsAndSummaryOfSignificantAccountingPoliciesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/NatureOfOperationsAndSummaryOfSignificantAccountingPoliciesPolicies" xlink:href="cae-20180331.xsd#NatureOfOperationsAndSummaryOfSignificantAccountingPoliciesPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/NatureOfOperationsAndSummaryOfSignificantAccountingPoliciesTables" xlink:href="cae-20180331.xsd#NatureOfOperationsAndSummaryOfSignificantAccountingPoliciesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/OperatingSegmentsAndGeographicInformation" xlink:href="cae-20180331.xsd#OperatingSegmentsAndGeographicInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/OperatingSegmentsAndGeographicInformationAssetsAndLiabilitiesEmployedBySegmentDetails" xlink:href="cae-20180331.xsd#OperatingSegmentsAndGeographicInformationAssetsAndLiabilitiesEmployedBySegmentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/OperatingSegmentsAndGeographicInformationCapitalExpendituresDetails" xlink:href="cae-20180331.xsd#OperatingSegmentsAndGeographicInformationCapitalExpendituresDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/OperatingSegmentsAndGeographicInformationDetails" xlink:href="cae-20180331.xsd#OperatingSegmentsAndGeographicInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/OperatingSegmentsAndGeographicInformationGeographicInformationDetails" xlink:href="cae-20180331.xsd#OperatingSegmentsAndGeographicInformationGeographicInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/OperatingSegmentsAndGeographicInformationOperatingProfitDetails" xlink:href="cae-20180331.xsd#OperatingSegmentsAndGeographicInformationOperatingProfitDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/OperatingSegmentsAndGeographicInformationProductsAndServicesInformationDetails" xlink:href="cae-20180331.xsd#OperatingSegmentsAndGeographicInformationProductsAndServicesInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/OperatingSegmentsAndGeographicInformationResultsBySegmentDetails" xlink:href="cae-20180331.xsd#OperatingSegmentsAndGeographicInformationResultsBySegmentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/OperatingSegmentsAndGeographicInformationTables" xlink:href="cae-20180331.xsd#OperatingSegmentsAndGeographicInformationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/OtherAssets" xlink:href="cae-20180331.xsd#OtherAssets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/OtherAssetsDetails" xlink:href="cae-20180331.xsd#OtherAssetsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/OtherAssetsInvestmentsInFinanceLeaseContractsDetails" xlink:href="cae-20180331.xsd#OtherAssetsInvestmentsInFinanceLeaseContractsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/OtherAssetsPaymentReceivablesDetails" xlink:href="cae-20180331.xsd#OtherAssetsPaymentReceivablesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/OtherAssetsTables" xlink:href="cae-20180331.xsd#OtherAssetsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/OtherGainsNet" xlink:href="cae-20180331.xsd#OtherGainsNet" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/OtherGainsNetDetails" xlink:href="cae-20180331.xsd#OtherGainsNetDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/OtherGainsNetGainsDetails" xlink:href="cae-20180331.xsd#OtherGainsNetGainsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/OtherGainsNetTables" xlink:href="cae-20180331.xsd#OtherGainsNetTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/PropertyPlantAndEquipment" xlink:href="cae-20180331.xsd#PropertyPlantAndEquipment" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/PropertyPlantAndEquipmentDetails" xlink:href="cae-20180331.xsd#PropertyPlantAndEquipmentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/PropertyPlantAndEquipmentTables" xlink:href="cae-20180331.xsd#PropertyPlantAndEquipmentTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/Provisions" xlink:href="cae-20180331.xsd#Provisions" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ProvisionsDetails" xlink:href="cae-20180331.xsd#ProvisionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ProvisionsTables" xlink:href="cae-20180331.xsd#ProvisionsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/RelatedPartyRelationships" xlink:href="cae-20180331.xsd#RelatedPartyRelationships" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/RelatedPartyRelationshipsDetails" xlink:href="cae-20180331.xsd#RelatedPartyRelationshipsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/RelatedPartyRelationshipsTables" xlink:href="cae-20180331.xsd#RelatedPartyRelationshipsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/RelatedPartyTransactions" xlink:href="cae-20180331.xsd#RelatedPartyTransactions" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/RelatedPartyTransactionsCompensationOfKeyManagementPersonnelDetails" xlink:href="cae-20180331.xsd#RelatedPartyTransactionsCompensationOfKeyManagementPersonnelDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/RelatedPartyTransactionsDetails" xlink:href="cae-20180331.xsd#RelatedPartyTransactionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/RelatedPartyTransactionsOutstandingBalancesDetails" xlink:href="cae-20180331.xsd#RelatedPartyTransactionsOutstandingBalancesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/RelatedPartyTransactionsTables" xlink:href="cae-20180331.xsd#RelatedPartyTransactionsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/RelatedPartyTransactionsTransactionsDetails" xlink:href="cae-20180331.xsd#RelatedPartyTransactionsTransactionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ShareBasedPayments" xlink:href="cae-20180331.xsd#ShareBasedPayments" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ShareBasedPaymentsAssumptionsDetails" xlink:href="cae-20180331.xsd#ShareBasedPaymentsAssumptionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ShareBasedPaymentsDetails" xlink:href="cae-20180331.xsd#ShareBasedPaymentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ShareBasedPaymentsDsuActivityDetails" xlink:href="cae-20180331.xsd#ShareBasedPaymentsDsuActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ShareBasedPaymentsEsopActivityDetails" xlink:href="cae-20180331.xsd#ShareBasedPaymentsEsopActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ShareBasedPaymentsEsopSummarizedDetails" xlink:href="cae-20180331.xsd#ShareBasedPaymentsEsopSummarizedDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ShareBasedPaymentsLtiActivityDetails" xlink:href="cae-20180331.xsd#ShareBasedPaymentsLtiActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ShareBasedPaymentsLtiPsuActivityDetails" xlink:href="cae-20180331.xsd#ShareBasedPaymentsLtiPsuActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ShareBasedPaymentsShareBasedCompensationCostDetails" xlink:href="cae-20180331.xsd#ShareBasedPaymentsShareBasedCompensationCostDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ShareBasedPaymentsTables" xlink:href="cae-20180331.xsd#ShareBasedPaymentsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ShareBasedPaymentsTsrRelativePerformanceIndexDetails" xlink:href="cae-20180331.xsd#ShareBasedPaymentsTsrRelativePerformanceIndexDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ShareCapitalEarningsPerShareAndDividends" xlink:href="cae-20180331.xsd#ShareCapitalEarningsPerShareAndDividends" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ShareCapitalEarningsPerShareAndDividendsDetails" xlink:href="cae-20180331.xsd#ShareCapitalEarningsPerShareAndDividendsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ShareCapitalEarningsPerShareAndDividendsEarningsPerShareComputationDetails" xlink:href="cae-20180331.xsd#ShareCapitalEarningsPerShareAndDividendsEarningsPerShareComputationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/ShareCapitalEarningsPerShareAndDividendsTables" xlink:href="cae-20180331.xsd#ShareCapitalEarningsPerShareAndDividendsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/SupplementaryCashFlowsInformation" xlink:href="cae-20180331.xsd#SupplementaryCashFlowsInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/SupplementaryCashFlowsInformationDetails" xlink:href="cae-20180331.xsd#SupplementaryCashFlowsInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cae.com/role/SupplementaryCashFlowsInformationTables" xlink:href="cae-20180331.xsd#SupplementaryCashFlowsInformationTables" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple" />
  <link:definitionLink xlink:role="http://www.cae.com/role/AccountsPayableAndAccruedLiabilities" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/AccountsPayableAndAccruedLiabilitiesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/AccountsPayableAndAccruedLiabilitiesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/AccountsReceivable" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/AccountsReceivableDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_C70B372B7DD5AEB61E64B285CEDA6130" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfFinancialAssetsTable" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable_2704C9A89FFC9F2A0A25B285CED9FDFA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_C70B372B7DD5AEB61E64B285CEDA6130" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_2704C9A89FFC9F2A0A25B285CED9FDFA" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_9E78125316001EB0AC3BB285CED913B0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_2704C9A89FFC9F2A0A25B285CED9FDFA" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_9E78125316001EB0AC3BB285CED913B0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CarryingAmountMember" xlink:label="loc_ifrs-full_CarryingAmountMember_A1F774ED75F6B2E8144EB285CED965B4_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_9E78125316001EB0AC3BB285CED913B0" xlink:to="loc_ifrs-full_CarryingAmountMember_A1F774ED75F6B2E8144EB285CED965B4_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CarryingAmountMember" xlink:label="loc_ifrs-full_CarryingAmountMember_A1F774ED75F6B2E8144EB285CED965B4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_9E78125316001EB0AC3BB285CED913B0" xlink:to="loc_ifrs-full_CarryingAmountMember_A1F774ED75F6B2E8144EB285CED965B4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GrossCarryingAmountMember" xlink:label="loc_ifrs-full_GrossCarryingAmountMember_5670058F8E6CDD6413B4B285CED9199F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_A1F774ED75F6B2E8144EB285CED965B4" xlink:to="loc_ifrs-full_GrossCarryingAmountMember_5670058F8E6CDD6413B4B285CED9199F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PastDueStatusAxis" xlink:label="loc_ifrs-full_PastDueStatusAxis_B063A3929F69EC1DCFCFB285CED98BAA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_2704C9A89FFC9F2A0A25B285CED9FDFA" xlink:to="loc_ifrs-full_PastDueStatusAxis_B063A3929F69EC1DCFCFB285CED98BAA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PastDueStatusMember" xlink:label="loc_ifrs-full_PastDueStatusMember_684AAA9BDBBC7A7FBF54B285CED94157_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_PastDueStatusAxis_B063A3929F69EC1DCFCFB285CED98BAA" xlink:to="loc_ifrs-full_PastDueStatusMember_684AAA9BDBBC7A7FBF54B285CED94157_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PastDueStatusMember" xlink:label="loc_ifrs-full_PastDueStatusMember_684AAA9BDBBC7A7FBF54B285CED94157" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_PastDueStatusAxis_B063A3929F69EC1DCFCFB285CED98BAA" xlink:to="loc_ifrs-full_PastDueStatusMember_684AAA9BDBBC7A7FBF54B285CED94157" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CurrentMember" xlink:label="loc_ifrs-full_CurrentMember_8C2AAD07E5CC5D1284F9B285CED99717" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PastDueStatusMember_684AAA9BDBBC7A7FBF54B285CED94157" xlink:to="loc_ifrs-full_CurrentMember_8C2AAD07E5CC5D1284F9B285CED99717" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NotLaterThanOneMonthMember" xlink:label="loc_ifrs-full_NotLaterThanOneMonthMember_CC079A2059AFE613D7AEB285CEDA3351" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PastDueStatusMember_684AAA9BDBBC7A7FBF54B285CED94157" xlink:to="loc_ifrs-full_NotLaterThanOneMonthMember_CC079A2059AFE613D7AEB285CEDA3351" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanOneMonthAndNotLaterThanTwoMonthsMember" xlink:label="loc_ifrs-full_LaterThanOneMonthAndNotLaterThanTwoMonthsMember_D033EEC47E50F733870CB285CEDADF34" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PastDueStatusMember_684AAA9BDBBC7A7FBF54B285CED94157" xlink:to="loc_ifrs-full_LaterThanOneMonthAndNotLaterThanTwoMonthsMember_D033EEC47E50F733870CB285CEDADF34" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember" xlink:label="loc_ifrs-full_LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember_0DD3CBADCE6967CE1A63B285CEDA2DE3" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PastDueStatusMember_684AAA9BDBBC7A7FBF54B285CED94157" xlink:to="loc_ifrs-full_LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember_0DD3CBADCE6967CE1A63B285CEDA2DE3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanThreeMonthsMember" xlink:label="loc_ifrs-full_LaterThanThreeMonthsMember_3EF0F9D932151FD2E18AB285CEDAD3A2" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PastDueStatusMember_684AAA9BDBBC7A7FBF54B285CED94157" xlink:to="loc_ifrs-full_LaterThanThreeMonthsMember_3EF0F9D932151FD2E18AB285CEDAD3A2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CurrentTradeReceivables" xlink:label="loc_ifrs-full_CurrentTradeReceivables_1D3574A5C423D05C29C6B285CEDA0CD5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_C70B372B7DD5AEB61E64B285CEDA6130" xlink:to="loc_ifrs-full_CurrentTradeReceivables_1D3574A5C423D05C29C6B285CEDA0CD5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AllowanceAccountForCreditLossesOfFinancialAssets" xlink:label="loc_ifrs-full_AllowanceAccountForCreditLossesOfFinancialAssets_DC8E79402EC33478FEB7B285CEDA4DD3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_C70B372B7DD5AEB61E64B285CEDA6130" xlink:to="loc_ifrs-full_AllowanceAccountForCreditLossesOfFinancialAssets_DC8E79402EC33478FEB7B285CEDA4DD3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CurrentAccruedIncome" xlink:label="loc_ifrs-full_CurrentAccruedIncome_CF2B8012A003BA34617FB285CEDA38F6" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_C70B372B7DD5AEB61E64B285CEDA6130" xlink:to="loc_ifrs-full_CurrentAccruedIncome_CF2B8012A003BA34617FB285CEDA38F6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TradeAndOtherCurrentReceivablesDueFromRelatedParties" xlink:label="loc_ifrs-full_TradeAndOtherCurrentReceivablesDueFromRelatedParties_0E9E2B2B9D9B59CABB4AB285CEDAADA4" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_C70B372B7DD5AEB61E64B285CEDA6130" xlink:to="loc_ifrs-full_TradeAndOtherCurrentReceivablesDueFromRelatedParties_0E9E2B2B9D9B59CABB4AB285CEDAADA4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherCurrentReceivables" xlink:label="loc_ifrs-full_OtherCurrentReceivables_5184E320554EF7066890B285CEDAC2E6" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_C70B372B7DD5AEB61E64B285CEDA6130" xlink:to="loc_ifrs-full_OtherCurrentReceivables_5184E320554EF7066890B285CEDAC2E6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TradeAndOtherCurrentReceivables" xlink:label="loc_ifrs-full_TradeAndOtherCurrentReceivables_2111DB5866511ADD491CB285CEDA75B6" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_C70B372B7DD5AEB61E64B285CEDA6130" xlink:to="loc_ifrs-full_TradeAndOtherCurrentReceivables_2111DB5866511ADD491CB285CEDA75B6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ReconciliationOfChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract" xlink:label="loc_ifrs-full_ReconciliationOfChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract_3D129C5CA07ABE2AF62BB285CEDAD9B1" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_C70B372B7DD5AEB61E64B285CEDA6130" xlink:to="loc_ifrs-full_ReconciliationOfChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract_3D129C5CA07ABE2AF62BB285CEDAD9B1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract" xlink:label="loc_ifrs-full_ChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract_7CCEF562EC48F06834A2B285CEDA4D0E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract_3D129C5CA07ABE2AF62BB285CEDAD9B1" xlink:to="loc_ifrs-full_ChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract_7CCEF562EC48F06834A2B285CEDA4D0E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AdditionalAllowanceRecognisedInProfitOrLossAllowanceAccountForCreditLossesOfFinancialAssets" xlink:label="loc_ifrs-full_AdditionalAllowanceRecognisedInProfitOrLossAllowanceAccountForCreditLossesOfFinancialAssets_DBF57D79A44C078ACB91B285CEDB1AA3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract_7CCEF562EC48F06834A2B285CEDA4D0E" xlink:to="loc_ifrs-full_AdditionalAllowanceRecognisedInProfitOrLossAllowanceAccountForCreditLossesOfFinancialAssets_DBF57D79A44C078ACB91B285CEDB1AA3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_UtilisationAllowanceAccountForCreditLossesOfFinancialAssets" xlink:label="loc_ifrs-full_UtilisationAllowanceAccountForCreditLossesOfFinancialAssets_B33C1DD48936CE220B69B285CEDB8D6B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract_7CCEF562EC48F06834A2B285CEDA4D0E" xlink:to="loc_ifrs-full_UtilisationAllowanceAccountForCreditLossesOfFinancialAssets_B33C1DD48936CE220B69B285CEDB8D6B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ReversalAllowanceAccountForCreditLossesOfFinancialAssets" xlink:label="loc_ifrs-full_ReversalAllowanceAccountForCreditLossesOfFinancialAssets_886A5CC5AC7AF4D07C15B285CEDB013B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract_7CCEF562EC48F06834A2B285CEDA4D0E" xlink:to="loc_ifrs-full_ReversalAllowanceAccountForCreditLossesOfFinancialAssets_886A5CC5AC7AF4D07C15B285CEDB013B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesAllowanceAccountForCreditLossesOfFinancialAssets" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesAllowanceAccountForCreditLossesOfFinancialAssets_CD01AF8D1EB43C42EC7DB285CEDB8DE4" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract_7CCEF562EC48F06834A2B285CEDA4D0E" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesAllowanceAccountForCreditLossesOfFinancialAssets_CD01AF8D1EB43C42EC7DB285CEDB8DE4" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/AccountsReceivableTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/AccumulatedOtherComprehensiveIncome" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/AccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems" xlink:label="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems_C22FCA45B6BA39DDEDFAFF7C21A8DB29" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable" xlink:label="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable_07985514DEFA0BE32430FF7C21A65130" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems_C22FCA45B6BA39DDEDFAFF7C21A8DB29" xlink:to="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable_07985514DEFA0BE32430FF7C21A65130" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_546851A05DF05B3CF4E8FF7C21A777F3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable_07985514DEFA0BE32430FF7C21A65130" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_546851A05DF05B3CF4E8FF7C21A777F3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EquityMember" xlink:label="loc_ifrs-full_EquityMember_8E9762EFCEA90DEB1CF7FF7C21A7BB50_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_546851A05DF05B3CF4E8FF7C21A777F3" xlink:to="loc_ifrs-full_EquityMember_8E9762EFCEA90DEB1CF7FF7C21A7BB50_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EquityMember" xlink:label="loc_ifrs-full_EquityMember_8E9762EFCEA90DEB1CF7FF7C21A7BB50" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_546851A05DF05B3CF4E8FF7C21A777F3" xlink:to="loc_ifrs-full_EquityMember_8E9762EFCEA90DEB1CF7FF7C21A7BB50" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember" xlink:label="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember_67E0ED51C5972516EF84FF7C21A7D9FB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_8E9762EFCEA90DEB1CF7FF7C21A7BB50" xlink:to="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember_67E0ED51C5972516EF84FF7C21A7D9FB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ReserveOfCashFlowHedgesMember" xlink:label="loc_ifrs-full_ReserveOfCashFlowHedgesMember_411ECADD83F5A22D3F14FF7C21A811E3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_8E9762EFCEA90DEB1CF7FF7C21A7BB50" xlink:to="loc_ifrs-full_ReserveOfCashFlowHedgesMember_411ECADD83F5A22D3F14FF7C21A811E3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssetsMember" xlink:label="loc_ifrs-full_ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssetsMember_DFD48AFCBCB87DA14776FF7C21A8B915" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_8E9762EFCEA90DEB1CF7FF7C21A7BB50" xlink:to="loc_ifrs-full_ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssetsMember_DFD48AFCBCB87DA14776FF7C21A8B915" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ReserveOfGainsAndLossesFromInvestmentsInEquityInstrumentsMember" xlink:label="loc_ifrs-full_ReserveOfGainsAndLossesFromInvestmentsInEquityInstrumentsMember_96AF7637CB6F1AD9DB19FF7C21A89C3B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_8E9762EFCEA90DEB1CF7FF7C21A7BB50" xlink:to="loc_ifrs-full_ReserveOfGainsAndLossesFromInvestmentsInEquityInstrumentsMember_96AF7637CB6F1AD9DB19FF7C21A89C3B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_ifrs-full_AccumulatedOtherComprehensiveIncomeMember_D5D4400A9678C1188F56FF7C21A8FB08" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_8E9762EFCEA90DEB1CF7FF7C21A7BB50" xlink:to="loc_ifrs-full_AccumulatedOtherComprehensiveIncomeMember_D5D4400A9678C1188F56FF7C21A8FB08" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Equity" xlink:label="loc_ifrs-full_Equity_A8DDBFE16ED32C731667FF7C21A91C6D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems_C22FCA45B6BA39DDEDFAFF7C21A8DB29" xlink:to="loc_ifrs-full_Equity_A8DDBFE16ED32C731667FF7C21A91C6D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherComprehensiveIncome" xlink:label="loc_ifrs-full_OtherComprehensiveIncome_6E95672DEEA60A4FD801FF7C21A9F884" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems_C22FCA45B6BA39DDEDFAFF7C21A8DB29" xlink:to="loc_ifrs-full_OtherComprehensiveIncome_6E95672DEEA60A4FD801FF7C21A9F884" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/AccumulatedOtherComprehensiveIncomeTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/BusinessCombinations" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/BusinessCombinationsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems" xlink:label="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems_C46A0A1DF31FF12D8165FE9A147AF362" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationTable" xlink:label="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationTable_E30C56754989CE151638FE9A147439F0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems_C46A0A1DF31FF12D8165FE9A147AF362" xlink:to="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationTable_E30C56754989CE151638FE9A147439F0" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" xlink:label="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_4B2C4D57B6671D2555DBFE9A1474E71E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationTable_E30C56754989CE151638FE9A147439F0" xlink:to="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_4B2C4D57B6671D2555DBFE9A1474E71E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwillMember" xlink:label="loc_ifrs-full_IntangibleAssetsOtherThanGoodwillMember_C6887BF0E91E710C0DE1FE9A14755C62_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_4B2C4D57B6671D2555DBFE9A1474E71E" xlink:to="loc_ifrs-full_IntangibleAssetsOtherThanGoodwillMember_C6887BF0E91E710C0DE1FE9A14755C62_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwillMember" xlink:label="loc_ifrs-full_IntangibleAssetsOtherThanGoodwillMember_C6887BF0E91E710C0DE1FE9A14755C62" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_4B2C4D57B6671D2555DBFE9A1474E71E" xlink:to="loc_ifrs-full_IntangibleAssetsOtherThanGoodwillMember_C6887BF0E91E710C0DE1FE9A14755C62" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CustomerrelatedIntangibleAssetsMember" xlink:label="loc_ifrs-full_CustomerrelatedIntangibleAssetsMember_CD2E321465DFF30B1BACFE9A14764CC0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IntangibleAssetsOtherThanGoodwillMember_C6887BF0E91E710C0DE1FE9A14755C62" xlink:to="loc_ifrs-full_CustomerrelatedIntangibleAssetsMember_CD2E321465DFF30B1BACFE9A14764CC0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BusinessCombinationsAxis" xlink:label="loc_ifrs-full_BusinessCombinationsAxis_F344344F9ECF6C9CBE7CFE9A147639D4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationTable_E30C56754989CE151638FE9A147439F0" xlink:to="loc_ifrs-full_BusinessCombinationsAxis_F344344F9ECF6C9CBE7CFE9A147639D4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForBusinessCombinationsMember" xlink:label="loc_ifrs-full_EntitysTotalForBusinessCombinationsMember_C83FD402C804DC3E0F48FE9A1477CA05_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_F344344F9ECF6C9CBE7CFE9A147639D4" xlink:to="loc_ifrs-full_EntitysTotalForBusinessCombinationsMember_C83FD402C804DC3E0F48FE9A1477CA05_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForBusinessCombinationsMember" xlink:label="loc_ifrs-full_EntitysTotalForBusinessCombinationsMember_C83FD402C804DC3E0F48FE9A1477CA05" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_F344344F9ECF6C9CBE7CFE9A147639D4" xlink:to="loc_ifrs-full_EntitysTotalForBusinessCombinationsMember_C83FD402C804DC3E0F48FE9A1477CA05" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PortfolioOfTrainingAssetsMember" xlink:label="loc_cae_PortfolioOfTrainingAssetsMember_82F8811B7E0648787A10FE9A1477A00D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForBusinessCombinationsMember_C83FD402C804DC3E0F48FE9A1477CA05" xlink:to="loc_cae_PortfolioOfTrainingAssetsMember_82F8811B7E0648787A10FE9A1477A00D" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AsianAviationCentreofExcellenceSdn.Bhd.Member" xlink:label="loc_cae_AsianAviationCentreofExcellenceSdn.Bhd.Member_38D0C18B46EFA64EE5B5FE9A1477FFFB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForBusinessCombinationsMember_C83FD402C804DC3E0F48FE9A1477CA05" xlink:to="loc_cae_AsianAviationCentreofExcellenceSdn.Bhd.Member_38D0C18B46EFA64EE5B5FE9A1477FFFB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_JointVenturesAxis" xlink:label="loc_ifrs-full_JointVenturesAxis_3E2F36A3FF259262C3F1FE9A1478B648" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationTable_E30C56754989CE151638FE9A147439F0" xlink:to="loc_ifrs-full_JointVenturesAxis_3E2F36A3FF259262C3F1FE9A1478B648" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForJointVenturesMember" xlink:label="loc_ifrs-full_EntitysTotalForJointVenturesMember_7C730B16FD4706EE4E82FE9A1478199C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_JointVenturesAxis_3E2F36A3FF259262C3F1FE9A1478B648" xlink:to="loc_ifrs-full_EntitysTotalForJointVenturesMember_7C730B16FD4706EE4E82FE9A1478199C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForJointVenturesMember" xlink:label="loc_ifrs-full_EntitysTotalForJointVenturesMember_7C730B16FD4706EE4E82FE9A1478199C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_JointVenturesAxis_3E2F36A3FF259262C3F1FE9A1478B648" xlink:to="loc_ifrs-full_EntitysTotalForJointVenturesMember_7C730B16FD4706EE4E82FE9A1478199C" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PhilippineAcademyofAviationTrainingMember" xlink:label="loc_cae_PhilippineAcademyofAviationTrainingMember_45E0754B59A81E29F5E1FE9A14799613" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_7C730B16FD4706EE4E82FE9A1478199C" xlink:to="loc_cae_PhilippineAcademyofAviationTrainingMember_45E0754B59A81E29F5E1FE9A14799613" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CashTransferred" xlink:label="loc_ifrs-full_CashTransferred_ED16D2BF65566A9BA2E7FE9A147B00C3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems_C46A0A1DF31FF12D8165FE9A147AF362" xlink:to="loc_ifrs-full_CashTransferred_ED16D2BF65566A9BA2E7FE9A147B00C3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate_1FCA67BEDFADF45747E8FE9A147CB3AB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems_C46A0A1DF31FF12D8165FE9A147AF362" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate_1FCA67BEDFADF45747E8FE9A147CB3AB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Goodwill" xlink:label="loc_ifrs-full_Goodwill_4CB0D7A576E80B774AABFE9A147D6876" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems_C46A0A1DF31FF12D8165FE9A147AF362" xlink:to="loc_ifrs-full_Goodwill_4CB0D7A576E80B774AABFE9A147D6876" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_OtherNoncurrentAssetsRecognisedAsOfAcquisitionDate" xlink:label="loc_cae_OtherNoncurrentAssetsRecognisedAsOfAcquisitionDate_BBFD18545AA333F48E14FE9A147DF83D" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems_C46A0A1DF31FF12D8165FE9A147AF362" xlink:to="loc_cae_OtherNoncurrentAssetsRecognisedAsOfAcquisitionDate_BBFD18545AA333F48E14FE9A147DF83D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NoncurrentLiabilitiesRecognisedAsOfAcquisitionDate" xlink:label="loc_ifrs-full_NoncurrentLiabilitiesRecognisedAsOfAcquisitionDate_CF69F98E7234D69E674CFE9A147D57A3" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems_C46A0A1DF31FF12D8165FE9A147AF362" xlink:to="loc_ifrs-full_NoncurrentLiabilitiesRecognisedAsOfAcquisitionDate_CF69F98E7234D69E674CFE9A147D57A3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PercentageOfVotingEquityInterestsAcquired" xlink:label="loc_ifrs-full_PercentageOfVotingEquityInterestsAcquired_A198381AFAE532F658AAFE9A147DE49E" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems_C46A0A1DF31FF12D8165FE9A147AF362" xlink:to="loc_ifrs-full_PercentageOfVotingEquityInterestsAcquired_A198381AFAE532F658AAFE9A147DE49E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ContingentLiabilitiesRecognisedInBusinessCombination" xlink:label="loc_ifrs-full_ContingentLiabilitiesRecognisedInBusinessCombination_2662835096D5E90B6EFBFE9A147EA5AF" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems_C46A0A1DF31FF12D8165FE9A147AF362" xlink:to="loc_ifrs-full_ContingentLiabilitiesRecognisedInBusinessCombination_2662835096D5E90B6EFBFE9A147EA5AF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProportionOfOwnershipInterestInJointVenture" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInJointVenture_710D4FE357EC70260FA8FE9A147EBFA0" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems_C46A0A1DF31FF12D8165FE9A147AF362" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInJointVenture_710D4FE357EC70260FA8FE9A147EBFA0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_6A1665434AE8388869CDFE9A147EE8E6" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems_C46A0A1DF31FF12D8165FE9A147AF362" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_6A1665434AE8388869CDFE9A147EE8E6" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberOfTrainingCentre" xlink:label="loc_cae_NumberOfTrainingCentre_3D34448782E472F6F290FE9A147FA7BC" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems_C46A0A1DF31FF12D8165FE9A147AF362" xlink:to="loc_cae_NumberOfTrainingCentre_3D34448782E472F6F290FE9A147FA7BC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed" xlink:label="loc_ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed_1FFD88CE19E1F667ABC1FE9A147FB48D" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems_C46A0A1DF31FF12D8165FE9A147AF362" xlink:to="loc_ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed_1FFD88CE19E1F667ABC1FE9A147FB48D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwill" xlink:label="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill_70C0CEA672535133934BFE9A147F853A" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems_C46A0A1DF31FF12D8165FE9A147AF362" xlink:to="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill_70C0CEA672535133934BFE9A147F853A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_GoodwillExpectedToBeNotDeductibleForTaxPurposes" xlink:label="loc_cae_GoodwillExpectedToBeNotDeductibleForTaxPurposes_B47F4C9385E90E0C7DD0FE9A147F8F56" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems_C46A0A1DF31FF12D8165FE9A147AF362" xlink:to="loc_cae_GoodwillExpectedToBeNotDeductibleForTaxPurposes_B47F4C9385E90E0C7DD0FE9A147F8F56" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FairValueOfAcquiredReceivables" xlink:label="loc_ifrs-full_FairValueOfAcquiredReceivables_1D1AE7BF5670FEEAA634FE9A147FBC26" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombinationLineItems_C46A0A1DF31FF12D8165FE9A147AF362" xlink:to="loc_ifrs-full_FairValueOfAcquiredReceivables_1D1AE7BF5670FEEAA634FE9A147FBC26" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/BusinessCombinationsNetAssetsAndLiabilitiesFromAcquisitionDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfBusinessCombinationsLineItems" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_B04774FB8B1F7A5B3105B285CEE6FD57" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfBusinessCombinationsTable" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_879A23ADDF5E383320D6B285CEE683E3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_B04774FB8B1F7A5B3105B285CEE6FD57" xlink:to="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_879A23ADDF5E383320D6B285CEE683E3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BusinessCombinationsAxis" xlink:label="loc_ifrs-full_BusinessCombinationsAxis_F44CA2B61BF7F83BDA2CB285CEE6D455" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_879A23ADDF5E383320D6B285CEE683E3" xlink:to="loc_ifrs-full_BusinessCombinationsAxis_F44CA2B61BF7F83BDA2CB285CEE6D455" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForBusinessCombinationsMember" xlink:label="loc_ifrs-full_EntitysTotalForBusinessCombinationsMember_10170EEEE49FB3FA5DF9B285CEE6DCF9_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_F44CA2B61BF7F83BDA2CB285CEE6D455" xlink:to="loc_ifrs-full_EntitysTotalForBusinessCombinationsMember_10170EEEE49FB3FA5DF9B285CEE6DCF9_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForBusinessCombinationsMember" xlink:label="loc_ifrs-full_EntitysTotalForBusinessCombinationsMember_10170EEEE49FB3FA5DF9B285CEE6DCF9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_F44CA2B61BF7F83BDA2CB285CEE6D455" xlink:to="loc_ifrs-full_EntitysTotalForBusinessCombinationsMember_10170EEEE49FB3FA5DF9B285CEE6DCF9" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AsianAviationCentreofExcellenceSdn.Bhd.Member" xlink:label="loc_cae_AsianAviationCentreofExcellenceSdn.Bhd.Member_1CD85611CF8A9AD9D613B285CEE6104A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForBusinessCombinationsMember_10170EEEE49FB3FA5DF9B285CEE6DCF9" xlink:to="loc_cae_AsianAviationCentreofExcellenceSdn.Bhd.Member_1CD85611CF8A9AD9D613B285CEE6104A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate" xlink:label="loc_ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate_82F3F6BFEA7F4CEBC07DB285CEE6B25D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_B04774FB8B1F7A5B3105B285CEE6FD57" xlink:to="loc_ifrs-full_CurrentAssetsRecognisedAsOfAcquisitionDate_82F3F6BFEA7F4CEBC07DB285CEE6B25D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CurrentLiabilitiesRecognisedAsOfAcquisitionDate" xlink:label="loc_ifrs-full_CurrentLiabilitiesRecognisedAsOfAcquisitionDate_3E1982BADFBACAAFC8F0B285CEE62A3C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_B04774FB8B1F7A5B3105B285CEE6FD57" xlink:to="loc_ifrs-full_CurrentLiabilitiesRecognisedAsOfAcquisitionDate_3E1982BADFBACAAFC8F0B285CEE62A3C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate_757A4EA189C391608BDAB285CEE68B2D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_B04774FB8B1F7A5B3105B285CEE6FD57" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate_757A4EA189C391608BDAB285CEE68B2D" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_InvestmentInEquityAccountedInvesteeRecognisedAsOfAcquisitionDate" xlink:label="loc_cae_InvestmentInEquityAccountedInvesteeRecognisedAsOfAcquisitionDate_F4233AC580D25AC7DD6BB285CEE655A2" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_B04774FB8B1F7A5B3105B285CEE6FD57" xlink:to="loc_cae_InvestmentInEquityAccountedInvesteeRecognisedAsOfAcquisitionDate_F4233AC580D25AC7DD6BB285CEE655A2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate" xlink:label="loc_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate_14A57791E14916EB27B9B285CEE7795E" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_B04774FB8B1F7A5B3105B285CEE6FD57" xlink:to="loc_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate_14A57791E14916EB27B9B285CEE7795E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate" xlink:label="loc_ifrs-full_DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate_AF465496A644EE704E1BB285CEE77619" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_B04774FB8B1F7A5B3105B285CEE6FD57" xlink:to="loc_ifrs-full_DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate_AF465496A644EE704E1BB285CEE77619" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NoncurrentLiabilitiesRecognisedAsOfAcquisitionDate" xlink:label="loc_ifrs-full_NoncurrentLiabilitiesRecognisedAsOfAcquisitionDate_BC0D4C5EDDB6E6E4F567B285CEE7EFF8" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_B04774FB8B1F7A5B3105B285CEE6FD57" xlink:to="loc_ifrs-full_NoncurrentLiabilitiesRecognisedAsOfAcquisitionDate_BC0D4C5EDDB6E6E4F567B285CEE7EFF8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed" xlink:label="loc_ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed_2FE3BCE152D31E8D6CDBB285CEE79B1A" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_B04774FB8B1F7A5B3105B285CEE6FD57" xlink:to="loc_ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed_2FE3BCE152D31E8D6CDBB285CEE79B1A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate" xlink:label="loc_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate_D523A3E371A0A21804F8B285CEE77971" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_B04774FB8B1F7A5B3105B285CEE6FD57" xlink:to="loc_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate_D523A3E371A0A21804F8B285CEE77971" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred" xlink:label="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_F4B63C560F9594EC757FB285CEE7BD70" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_B04774FB8B1F7A5B3105B285CEE6FD57" xlink:to="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_F4B63C560F9594EC757FB285CEE7BD70" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ContingentLiabilitiesRecognisedInBusinessCombination" xlink:label="loc_ifrs-full_ContingentLiabilitiesRecognisedInBusinessCombination_6186708DA4FCF122D960B285CEE7F132" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_B04774FB8B1F7A5B3105B285CEE6FD57" xlink:to="loc_ifrs-full_ContingentLiabilitiesRecognisedInBusinessCombination_6186708DA4FCF122D960B285CEE7F132" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SettlementofPreexistingRelationshipRecognisedInBusinessCombination" xlink:label="loc_cae_SettlementofPreexistingRelationshipRecognisedInBusinessCombination_850569EBE0239F788ECDB285CEE70E22" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_B04774FB8B1F7A5B3105B285CEE6FD57" xlink:to="loc_cae_SettlementofPreexistingRelationshipRecognisedInBusinessCombination_850569EBE0239F788ECDB285CEE70E22" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AcquisitiondateFairValueOfEquityInterestInAcquireeHeldByAcquirerImmediatelyBeforeAcquisitionDate" xlink:label="loc_ifrs-full_AcquisitiondateFairValueOfEquityInterestInAcquireeHeldByAcquirerImmediatelyBeforeAcquisitionDate_8B2D2492EED6D5D4D2EBB285CEE778EA" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_B04774FB8B1F7A5B3105B285CEE6FD57" xlink:to="loc_ifrs-full_AcquisitiondateFairValueOfEquityInterestInAcquireeHeldByAcquirerImmediatelyBeforeAcquisitionDate_8B2D2492EED6D5D4D2EBB285CEE778EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CashTransferred" xlink:label="loc_ifrs-full_CashTransferred_C82C228FCE7177043194B285CEE75A3D" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_B04774FB8B1F7A5B3105B285CEE6FD57" xlink:to="loc_ifrs-full_CashTransferred_C82C228FCE7177043194B285CEE75A3D" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/BusinessCombinationsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/CapitalRiskManagement" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/CapitalRiskManagementDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/CapitalRiskManagementTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/ChangesInAccountingPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/ChangesInAccountingPoliciesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems" xlink:label="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_6CD23C08A777A6DBE7E2FBCFFD8AE2C4" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable" xlink:label="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable_41D962ECA930B93B33A6FBCFFD87BC5E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_6CD23C08A777A6DBE7E2FBCFFD8AE2C4" xlink:to="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable_41D962ECA930B93B33A6FBCFFD87BC5E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ScenarioAxis" xlink:label="loc_cae_ScenarioAxis_33AFDDAEDA609D9EC377FC01C808064B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable_41D962ECA930B93B33A6FBCFFD87BC5E" xlink:to="loc_cae_ScenarioAxis_33AFDDAEDA609D9EC377FC01C808064B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ScenarioDomain" xlink:label="loc_cae_ScenarioDomain_294F9A8799A0512F852BFC01C80AAD3D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_ScenarioAxis_33AFDDAEDA609D9EC377FC01C808064B" xlink:to="loc_cae_ScenarioDomain_294F9A8799A0512F852BFC01C80AAD3D_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ScenarioDomain" xlink:label="loc_cae_ScenarioDomain_294F9A8799A0512F852BFC01C80AAD3D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_ScenarioAxis_33AFDDAEDA609D9EC377FC01C808064B" xlink:to="loc_cae_ScenarioDomain_294F9A8799A0512F852BFC01C80AAD3D" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AsReportedMember" xlink:label="loc_cae_AsReportedMember_51694D320548C8CE6544FC02507B5E10" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_ScenarioDomain_294F9A8799A0512F852BFC01C80AAD3D" xlink:to="loc_cae_AsReportedMember_51694D320548C8CE6544FC02507B5E10" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AsRestatedMember" xlink:label="loc_cae_AsRestatedMember_83C7A5BDFA88CA8E5779FC02DDE6EB1B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_ScenarioDomain_294F9A8799A0512F852BFC01C80AAD3D" xlink:to="loc_cae_AsRestatedMember_83C7A5BDFA88CA8E5779FC02DDE6EB1B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis" xlink:label="loc_ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis_D507EC43A712224C7E25FBCFFD88E79C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsTable_41D962ECA930B93B33A6FBCFFD87BC5E" xlink:to="loc_ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis_D507EC43A712224C7E25FBCFFD88E79C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RestatedMember" xlink:label="loc_ifrs-full_RestatedMember_03B48E8A485F080B1926FBCFFD891499_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis_D507EC43A712224C7E25FBCFFD88E79C" xlink:to="loc_ifrs-full_RestatedMember_03B48E8A485F080B1926FBCFFD891499_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RestatedMember" xlink:label="loc_ifrs-full_RestatedMember_03B48E8A485F080B1926FBCFFD891499" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis_D507EC43A712224C7E25FBCFFD88E79C" xlink:to="loc_ifrs-full_RestatedMember_03B48E8A485F080B1926FBCFFD891499" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PreviouslyStatedMember" xlink:label="loc_ifrs-full_PreviouslyStatedMember_21363788C9C08856A64BFBCFFD894395" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestatedMember_03B48E8A485F080B1926FBCFFD891499" xlink:to="loc_ifrs-full_PreviouslyStatedMember_21363788C9C08856A64BFBCFFD894395" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncreaseDecreaseDueToApplicationOfIFRS15Member" xlink:label="loc_ifrs-full_IncreaseDecreaseDueToApplicationOfIFRS15Member_54AF9FA83B8E3E13B3BEFBCFFD8A499A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestatedMember_03B48E8A485F080B1926FBCFFD891499" xlink:to="loc_ifrs-full_IncreaseDecreaseDueToApplicationOfIFRS15Member_54AF9FA83B8E3E13B3BEFBCFFD8A499A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CurrentAssets" xlink:label="loc_ifrs-full_CurrentAssets_850D5C77B78C61BB92E2FBCFFD8A435D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_6CD23C08A777A6DBE7E2FBCFFD8AE2C4" xlink:to="loc_ifrs-full_CurrentAssets_850D5C77B78C61BB92E2FBCFFD8A435D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NoncurrentAssets" xlink:label="loc_ifrs-full_NoncurrentAssets_D5C91516ACFFF5DE3C24FBCFFD8B4153" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_6CD23C08A777A6DBE7E2FBCFFD8AE2C4" xlink:to="loc_ifrs-full_NoncurrentAssets_D5C91516ACFFF5DE3C24FBCFFD8B4153" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Assets" xlink:label="loc_ifrs-full_Assets_4AAD229CBF1427505663FBCFFD8BDCDA" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_6CD23C08A777A6DBE7E2FBCFFD8AE2C4" xlink:to="loc_ifrs-full_Assets_4AAD229CBF1427505663FBCFFD8BDCDA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CurrentLiabilities" xlink:label="loc_ifrs-full_CurrentLiabilities_92C38DC32196913A6742FBCFFD8B24D4" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_6CD23C08A777A6DBE7E2FBCFFD8AE2C4" xlink:to="loc_ifrs-full_CurrentLiabilities_92C38DC32196913A6742FBCFFD8B24D4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NoncurrentLiabilities" xlink:label="loc_ifrs-full_NoncurrentLiabilities_5CD2B9AA499BACB53E5FFBCFFD8CDEFB" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_6CD23C08A777A6DBE7E2FBCFFD8AE2C4" xlink:to="loc_ifrs-full_NoncurrentLiabilities_5CD2B9AA499BACB53E5FFBCFFD8CDEFB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Liabilities" xlink:label="loc_ifrs-full_Liabilities_A5347319942C19D512E0FBCFFD8D0E19" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_6CD23C08A777A6DBE7E2FBCFFD8AE2C4" xlink:to="loc_ifrs-full_Liabilities_A5347319942C19D512E0FBCFFD8D0E19" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EquityAttributableToOwnersOfParent" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParent_5C24EF08B35CEB48502EFBCFFD8D6E93" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_6CD23C08A777A6DBE7E2FBCFFD8AE2C4" xlink:to="loc_ifrs-full_EquityAttributableToOwnersOfParent_5C24EF08B35CEB48502EFBCFFD8D6E93" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NoncontrollingInterests" xlink:label="loc_ifrs-full_NoncontrollingInterests_1B643173A4893BF93305FBCFFD8D5690" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_6CD23C08A777A6DBE7E2FBCFFD8AE2C4" xlink:to="loc_ifrs-full_NoncontrollingInterests_1B643173A4893BF93305FBCFFD8D5690" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Equity" xlink:label="loc_ifrs-full_Equity_B51FDBCE4E1B4F7BA470FBCFFD978648" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_6CD23C08A777A6DBE7E2FBCFFD8AE2C4" xlink:to="loc_ifrs-full_Equity_B51FDBCE4E1B4F7BA470FBCFFD978648" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Revenue" xlink:label="loc_ifrs-full_Revenue_05B30F38E44564451517FBCFFD9840CA" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_6CD23C08A777A6DBE7E2FBCFFD8AE2C4" xlink:to="loc_ifrs-full_Revenue_05B30F38E44564451517FBCFFD9840CA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProfitLossFromOperatingActivities" xlink:label="loc_ifrs-full_ProfitLossFromOperatingActivities_961085273F4076D76BE5FBCFFD98D535" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_6CD23C08A777A6DBE7E2FBCFFD8AE2C4" xlink:to="loc_ifrs-full_ProfitLossFromOperatingActivities_961085273F4076D76BE5FBCFFD98D535" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinanceCosts" xlink:label="loc_ifrs-full_FinanceCosts_1E5D882F22C064F68320FBCFFD980580" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems_6CD23C08A777A6DBE7E2FBCFFD8AE2C4" xlink:to="loc_ifrs-full_FinanceCosts_1E5D882F22C064F68320FBCFFD980580" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/ChangesInAccountingPoliciesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/Commitments" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/CommitmentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems" xlink:label="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems_A034F70BA1C9EB489A1DFE92C26C507B" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable" xlink:label="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable_76F913C491CE7C37C811FE92C2620442" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems_A034F70BA1C9EB489A1DFE92C26C507B" xlink:to="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable_76F913C491CE7C37C811FE92C2620442" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MaturityAxis" xlink:label="loc_ifrs-full_MaturityAxis_41C4E5AC5856FC70FAE5FE92C2624CB8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable_76F913C491CE7C37C811FE92C2620442" xlink:to="loc_ifrs-full_MaturityAxis_41C4E5AC5856FC70FAE5FE92C2624CB8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="loc_ifrs-full_AggregatedTimeBandsMember_3A2D71921FF31C6C71CCFE92C263413E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MaturityAxis_41C4E5AC5856FC70FAE5FE92C2624CB8" xlink:to="loc_ifrs-full_AggregatedTimeBandsMember_3A2D71921FF31C6C71CCFE92C263413E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="loc_ifrs-full_AggregatedTimeBandsMember_3A2D71921FF31C6C71CCFE92C263413E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MaturityAxis_41C4E5AC5856FC70FAE5FE92C2624CB8" xlink:to="loc_ifrs-full_AggregatedTimeBandsMember_3A2D71921FF31C6C71CCFE92C263413E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NotLaterThanOneYearMember" xlink:label="loc_ifrs-full_NotLaterThanOneYearMember_4A86CB37C48B89DDDF1CFE92C2654D13" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_3A2D71921FF31C6C71CCFE92C263413E" xlink:to="loc_ifrs-full_NotLaterThanOneYearMember_4A86CB37C48B89DDDF1CFE92C2654D13" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember" xlink:label="loc_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember_DB33F7BD28879FC02A53FE92C26B3647" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_3A2D71921FF31C6C71CCFE92C263413E" xlink:to="loc_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember_DB33F7BD28879FC02A53FE92C26B3647" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanFiveYearsMember" xlink:label="loc_ifrs-full_LaterThanFiveYearsMember_7569EEA25F1C46A55C86FE92C26CBB1F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_3A2D71921FF31C6C71CCFE92C263413E" xlink:to="loc_ifrs-full_LaterThanFiveYearsMember_7569EEA25F1C46A55C86FE92C26CBB1F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease" xlink:label="loc_ifrs-full_MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease_2895B692A0547C49AFE6FE92C26DFAC7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems_A034F70BA1C9EB489A1DFE92C26C507B" xlink:to="loc_ifrs-full_MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease_2895B692A0547C49AFE6FE92C26DFAC7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RentalExpense" xlink:label="loc_ifrs-full_RentalExpense_1FEB536B03066DC71936FE92C26FC1EC" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems_A034F70BA1C9EB489A1DFE92C26C507B" xlink:to="loc_ifrs-full_RentalExpense_1FEB536B03066DC71936FE92C26FC1EC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ContractualCapitalCommitments" xlink:label="loc_ifrs-full_ContractualCapitalCommitments_85EB9358AFFA8E26A65BFE92C26F42BF" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems_A034F70BA1C9EB489A1DFE92C26C507B" xlink:to="loc_ifrs-full_ContractualCapitalCommitments_85EB9358AFFA8E26A65BFE92C26F42BF" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/CommitmentsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/ConsolidatedIncomeStatement" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/ConsolidatedStatementOfCashFlowsStatement" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/ConsolidatedStatementOfChangesInEquityStatement" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_StatementOfChangesInEquityLineItems" xlink:label="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_StatementOfChangesInEquityTable" xlink:label="loc_ifrs-full_StatementOfChangesInEquityTable_84C1EF64AA5686D2DD40FBCFFE73C617" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:to="loc_ifrs-full_StatementOfChangesInEquityTable_84C1EF64AA5686D2DD40FBCFFE73C617" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_4D83DD3D2F2EA3E80FABFBCFFE7320F8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_StatementOfChangesInEquityTable_84C1EF64AA5686D2DD40FBCFFE73C617" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_4D83DD3D2F2EA3E80FABFBCFFE7320F8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EquityMember" xlink:label="loc_ifrs-full_EquityMember_1B97A88620FD21CCEA96FBCFFE730EA7_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_4D83DD3D2F2EA3E80FABFBCFFE7320F8" xlink:to="loc_ifrs-full_EquityMember_1B97A88620FD21CCEA96FBCFFE730EA7_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EquityMember" xlink:label="loc_ifrs-full_EquityMember_1B97A88620FD21CCEA96FBCFFE730EA7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_4D83DD3D2F2EA3E80FABFBCFFE7320F8" xlink:to="loc_ifrs-full_EquityMember_1B97A88620FD21CCEA96FBCFFE730EA7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_4FC1A672DF993DA90FF7FBCFFE744A99" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_1B97A88620FD21CCEA96FBCFFE730EA7" xlink:to="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_4FC1A672DF993DA90FF7FBCFFE744A99" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IssuedCapitalMember" xlink:label="loc_ifrs-full_IssuedCapitalMember_2F4BC364A855BE6A7306FBCFFE7417E7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_4FC1A672DF993DA90FF7FBCFFE744A99" xlink:to="loc_ifrs-full_IssuedCapitalMember_2F4BC364A855BE6A7306FBCFFE7417E7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SharePremiumMember" xlink:label="loc_ifrs-full_SharePremiumMember_509FE94E7B3EC1868C97FBCFFE75125C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_4FC1A672DF993DA90FF7FBCFFE744A99" xlink:to="loc_ifrs-full_SharePremiumMember_509FE94E7B3EC1868C97FBCFFE75125C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_ifrs-full_AccumulatedOtherComprehensiveIncomeMember_FD09F5D67365132A8220FBCFFE75AAA8" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_4FC1A672DF993DA90FF7FBCFFE744A99" xlink:to="loc_ifrs-full_AccumulatedOtherComprehensiveIncomeMember_FD09F5D67365132A8220FBCFFE75AAA8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RetainedEarningsMember" xlink:label="loc_ifrs-full_RetainedEarningsMember_A54FD997515F22CD8870FBCFFE757E74" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_4FC1A672DF993DA90FF7FBCFFE744A99" xlink:to="loc_ifrs-full_RetainedEarningsMember_A54FD997515F22CD8870FBCFFE757E74" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NoncontrollingInterestsMember" xlink:label="loc_ifrs-full_NoncontrollingInterestsMember_FC94FA802AAACE68665BFBCFFE765B42" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_1B97A88620FD21CCEA96FBCFFE730EA7" xlink:to="loc_ifrs-full_NoncontrollingInterestsMember_FC94FA802AAACE68665BFBCFFE765B42" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfSharesOutstanding" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding_A867D38C97E04DB9FC49FBCFFE76D34D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:to="loc_ifrs-full_NumberOfSharesOutstanding_A867D38C97E04DB9FC49FBCFFE76D34D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Equity" xlink:label="loc_ifrs-full_Equity_834CEF804136C2A2C54AFBCFFE76B617" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:to="loc_ifrs-full_Equity_834CEF804136C2A2C54AFBCFFE76B617" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProfitLoss" xlink:label="loc_ifrs-full_ProfitLoss_1BF60CBF9EBD226FC8D2FBCFFE77C172" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:to="loc_ifrs-full_ProfitLoss_1BF60CBF9EBD226FC8D2FBCFFE77C172" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ComprehensiveIncomeAbstract" xlink:label="loc_ifrs-full_ComprehensiveIncomeAbstract_B55F27FAA0793AC588D6FBCFFE7749DF" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:to="loc_ifrs-full_ComprehensiveIncomeAbstract_B55F27FAA0793AC588D6FBCFFE7749DF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxHedgesOfNetInvestmentsInForeignOperations" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxHedgesOfNetInvestmentsInForeignOperations_B9DFAC4358DDBC429B15FBD312969CD1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComprehensiveIncomeAbstract_B55F27FAA0793AC588D6FBCFFE7749DF" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxHedgesOfNetInvestmentsInForeignOperations_B9DFAC4358DDBC429B15FBD312969CD1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges_95442AB5BE21A15B20D2FBCFFE78AA31" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComprehensiveIncomeAbstract_B55F27FAA0793AC588D6FBCFFE7749DF" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges_95442AB5BE21A15B20D2FBCFFE78AA31" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxAvailableforsaleFinancialAssets" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxAvailableforsaleFinancialAssets_0716AFF557EE6DD08FBBFBCFFE78A4DD" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComprehensiveIncomeAbstract_B55F27FAA0793AC588D6FBCFFE7749DF" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxAvailableforsaleFinancialAssets_0716AFF557EE6DD08FBBFBCFFE78A4DD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:label="loc_ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossNetOfTax_A02FF782E8CEF9E969F5FBCFFE7875D6" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComprehensiveIncomeAbstract_B55F27FAA0793AC588D6FBCFFE7749DF" xlink:to="loc_ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossNetOfTax_A02FF782E8CEF9E969F5FBCFFE7875D6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans_B0D9228311D471D104F1FBCFFE78880C" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComprehensiveIncomeAbstract_B55F27FAA0793AC588D6FBCFFE7749DF" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans_B0D9228311D471D104F1FBCFFE78880C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ComprehensiveIncome" xlink:label="loc_ifrs-full_ComprehensiveIncome_25064337CBE57B532E30FBCFFE780301" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:to="loc_ifrs-full_ComprehensiveIncome_25064337CBE57B532E30FBCFFE780301" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_D9CF4EF18AE4425E10FEFBCFFE7979C8" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:to="loc_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_D9CF4EF18AE4425E10FEFBCFFE7979C8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncreaseDecreaseThroughExerciseOfOptions" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions_7B299F042F8912D035EFFBCFFE7958A7" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions_7B299F042F8912D035EFFBCFFE7958A7" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_OptionalCashPurchaseShares" xlink:label="loc_cae_OptionalCashPurchaseShares_F282655B39DC451FE6E8FBCFFE796604" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:to="loc_cae_OptionalCashPurchaseShares_F282655B39DC451FE6E8FBCFFE796604" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_OptionalCashPurchaseValue" xlink:label="loc_cae_OptionalCashPurchaseValue_BB54559433DD30120962FBCFFE7A24A5" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:to="loc_cae_OptionalCashPurchaseValue_BB54559433DD30120962FBCFFE7A24A5" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PurchaseofTreasurySharesShares" xlink:label="loc_cae_PurchaseofTreasurySharesShares_1387CBBB3A4A5C727872FBCFFE7AF8F6" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:to="loc_cae_PurchaseofTreasurySharesShares_1387CBBB3A4A5C727872FBCFFE7AF8F6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PurchaseOfTreasuryShares" xlink:label="loc_ifrs-full_PurchaseOfTreasuryShares_659522518E2CABC38969FBCFFE7A0D5B" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:to="loc_ifrs-full_PurchaseOfTreasuryShares_659522518E2CABC38969FBCFFE7A0D5B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TransferUponExerciseOfStockOptionsValue" xlink:label="loc_cae_TransferUponExerciseOfStockOptionsValue_6672518F0F793816BB38FBCFFE7A91A4" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:to="loc_cae_TransferUponExerciseOfStockOptionsValue_6672518F0F793816BB38FBCFFE7A91A4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_D1567B183C71D31C0EBFFBCFFE7A9AA6" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_D1567B183C71D31C0EBFFBCFFE7A9AA6" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AdditionsToNoncontrollingInterests" xlink:label="loc_cae_AdditionsToNoncontrollingInterests_6494A5761D2633503A7AFBCFFE7B98B0" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:to="loc_cae_AdditionsToNoncontrollingInterests_6494A5761D2633503A7AFBCFFE7B98B0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DividendsPaidToNoncontrollingInterests" xlink:label="loc_ifrs-full_DividendsPaidToNoncontrollingInterests_7F9D7CF276D91AE76ECDFBCFFE7BF29B" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:to="loc_ifrs-full_DividendsPaidToNoncontrollingInterests_7F9D7CF276D91AE76ECDFBCFFE7BF29B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_StockDividendIssuedDuringPeriodShares" xlink:label="loc_cae_StockDividendIssuedDuringPeriodShares_241D0EE26BF71C058A6EFBCFFE7BFB81" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:to="loc_cae_StockDividendIssuedDuringPeriodShares_241D0EE26BF71C058A6EFBCFFE7BFB81" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_StockDividendIssuedDuringPeriodValue" xlink:label="loc_cae_StockDividendIssuedDuringPeriodValue_76B0696D2FE87E041636FBCFFE7C89F9" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:to="loc_cae_StockDividendIssuedDuringPeriodValue_76B0696D2FE87E041636FBCFFE7C89F9" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CashDividendIssuedDuringPeriodValue" xlink:label="loc_cae_CashDividendIssuedDuringPeriodValue_6DBF8EF0BFF700CCEA00FBCFFE7CFBF3" xlink:type="locator" />
    <link:definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_350A5D954045423CB477FBCFFE760037" xlink:to="loc_cae_CashDividendIssuedDuringPeriodValue_6DBF8EF0BFF700CCEA00FBCFFE7CFBF3" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/ConsolidatedStatementOfComprehensiveIncome" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems" xlink:label="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems_8C233AA6382FF8F87F4E22F3CEC49AE5" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable" xlink:label="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable_8DFC47EAEF42BA7E535622F3CEC12328" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems_8C233AA6382FF8F87F4E22F3CEC49AE5" xlink:to="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable_8DFC47EAEF42BA7E535622F3CEC12328" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ContinuingAndDiscontinuedOperationsAxis" xlink:label="loc_ifrs-full_ContinuingAndDiscontinuedOperationsAxis_0958DEAB7A544773825B22F3CEC2C73F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable_8DFC47EAEF42BA7E535622F3CEC12328" xlink:to="loc_ifrs-full_ContinuingAndDiscontinuedOperationsAxis_0958DEAB7A544773825B22F3CEC2C73F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregateContinuingAndDiscontinuedOperationsMember" xlink:label="loc_ifrs-full_AggregateContinuingAndDiscontinuedOperationsMember_D23A84D69B6F07051E4522F3CEC32196_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ContinuingAndDiscontinuedOperationsAxis_0958DEAB7A544773825B22F3CEC2C73F" xlink:to="loc_ifrs-full_AggregateContinuingAndDiscontinuedOperationsMember_D23A84D69B6F07051E4522F3CEC32196_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregateContinuingAndDiscontinuedOperationsMember" xlink:label="loc_ifrs-full_AggregateContinuingAndDiscontinuedOperationsMember_D23A84D69B6F07051E4522F3CEC32196" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ContinuingAndDiscontinuedOperationsAxis_0958DEAB7A544773825B22F3CEC2C73F" xlink:to="loc_ifrs-full_AggregateContinuingAndDiscontinuedOperationsMember_D23A84D69B6F07051E4522F3CEC32196" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ContinuingOperationsMember" xlink:label="loc_ifrs-full_ContinuingOperationsMember_EA4EDBED2CBAD54E6B6522F3CEC39439" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregateContinuingAndDiscontinuedOperationsMember_D23A84D69B6F07051E4522F3CEC32196" xlink:to="loc_ifrs-full_ContinuingOperationsMember_EA4EDBED2CBAD54E6B6522F3CEC39439" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DiscontinuedOperationsMember" xlink:label="loc_ifrs-full_DiscontinuedOperationsMember_7344F3F0620DB605BE1F22F3CEC40853" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregateContinuingAndDiscontinuedOperationsMember_D23A84D69B6F07051E4522F3CEC32196" xlink:to="loc_ifrs-full_DiscontinuedOperationsMember_7344F3F0620DB605BE1F22F3CEC40853" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_IncomeStatementLocation1Axis" xlink:label="loc_cae_IncomeStatementLocation1Axis_E461B8B9CEC08389D6B622F6E41C30F7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable_8DFC47EAEF42BA7E535622F3CEC12328" xlink:to="loc_cae_IncomeStatementLocation1Axis_E461B8B9CEC08389D6B622F6E41C30F7" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_IncomeStatementLocation1Domain" xlink:label="loc_cae_IncomeStatementLocation1Domain_3DCB0AEF9EEB8028D91722F6E42FC741_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_IncomeStatementLocation1Axis_E461B8B9CEC08389D6B622F6E41C30F7" xlink:to="loc_cae_IncomeStatementLocation1Domain_3DCB0AEF9EEB8028D91722F6E42FC741_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_IncomeStatementLocation1Domain" xlink:label="loc_cae_IncomeStatementLocation1Domain_3DCB0AEF9EEB8028D91722F6E42FC741" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_IncomeStatementLocation1Axis_E461B8B9CEC08389D6B622F6E41C30F7" xlink:to="loc_cae_IncomeStatementLocation1Domain_3DCB0AEF9EEB8028D91722F6E42FC741" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_RevenueMember" xlink:label="loc_cae_RevenueMember_87554FFC47A5DF2E38F322F6E4303D72" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_IncomeStatementLocation1Domain_3DCB0AEF9EEB8028D91722F6E42FC741" xlink:to="loc_cae_RevenueMember_87554FFC47A5DF2E38F322F6E4303D72" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FinanceExpenseNetMember" xlink:label="loc_cae_FinanceExpenseNetMember_C8FDBE12D624A45BB7E622F6E43025E9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_IncomeStatementLocation1Domain_3DCB0AEF9EEB8028D91722F6E42FC741" xlink:to="loc_cae_FinanceExpenseNetMember_C8FDBE12D624A45BB7E622F6E43025E9" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_OtherGainsNetMember" xlink:label="loc_cae_OtherGainsNetMember_8BB45288B8E534A3AE4322F6E431F198" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_IncomeStatementLocation1Domain_3DCB0AEF9EEB8028D91722F6E42FC741" xlink:to="loc_cae_OtherGainsNetMember_8BB45288B8E534A3AE4322F6E431F198" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProfitLoss" xlink:label="loc_ifrs-full_ProfitLoss_08B2FC891BF6C080A7D522F3CEC4339F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems_8C233AA6382FF8F87F4E22F3CEC49AE5" xlink:to="loc_ifrs-full_ProfitLoss_08B2FC891BF6C080A7D522F3CEC4339F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract" xlink:label="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract_834EF904FCFDDFB2437422F3CEC5D88E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems_8C233AA6382FF8F87F4E22F3CEC49AE5" xlink:to="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract_834EF904FCFDDFB2437422F3CEC5D88E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTaxExchangeDifferencesOnTranslation" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxExchangeDifferencesOnTranslation_0DA6B7E3B06D732DD24C22F3CEC5645E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract_834EF904FCFDDFB2437422F3CEC5D88E" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxExchangeDifferencesOnTranslation_0DA6B7E3B06D732DD24C22F3CEC5645E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GainsLossesOnHedgesOfNetInvestmentsInForeignOperationsBeforeTax" xlink:label="loc_ifrs-full_GainsLossesOnHedgesOfNetInvestmentsInForeignOperationsBeforeTax_04EFBEC4A55EF8CBE48222F3CEC637AB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract_834EF904FCFDDFB2437422F3CEC5D88E" xlink:to="loc_ifrs-full_GainsLossesOnHedgesOfNetInvestmentsInForeignOperationsBeforeTax_04EFBEC4A55EF8CBE48222F3CEC637AB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ReclassificationAdjustmentsOnHedgesOfNetInvestmentsInForeignOperationsBeforeTax" xlink:label="loc_ifrs-full_ReclassificationAdjustmentsOnHedgesOfNetInvestmentsInForeignOperationsBeforeTax_B38ADC4EEAD66F3855CB22F3CEC6557E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract_834EF904FCFDDFB2437422F3CEC5D88E" xlink:to="loc_ifrs-full_ReclassificationAdjustmentsOnHedgesOfNetInvestmentsInForeignOperationsBeforeTax_B38ADC4EEAD66F3855CB22F3CEC6557E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncomeTaxRelatingToExchangeDifferencesOnTranslationOfOtherComprehensiveIncome" xlink:label="loc_ifrs-full_IncomeTaxRelatingToExchangeDifferencesOnTranslationOfOtherComprehensiveIncome_C6587FCA62FD754693EE22F3CEC71269" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract_834EF904FCFDDFB2437422F3CEC5D88E" xlink:to="loc_ifrs-full_IncomeTaxRelatingToExchangeDifferencesOnTranslationOfOtherComprehensiveIncome_C6587FCA62FD754693EE22F3CEC71269" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxHedgesOfNetInvestmentsInForeignOperations" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxHedgesOfNetInvestmentsInForeignOperations_F406DB56D8DAD4A5DB3222F3CEC7FEDA" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract_834EF904FCFDDFB2437422F3CEC5D88E" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxHedgesOfNetInvestmentsInForeignOperations_F406DB56D8DAD4A5DB3222F3CEC7FEDA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GainsLossesOnCashFlowHedgesBeforeTax" xlink:label="loc_ifrs-full_GainsLossesOnCashFlowHedgesBeforeTax_7B472B2485DB383986A522F3CEC80C5A" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract_834EF904FCFDDFB2437422F3CEC5D88E" xlink:to="loc_ifrs-full_GainsLossesOnCashFlowHedgesBeforeTax_7B472B2485DB383986A522F3CEC80C5A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ReclassificationAdjustmentsOnCashFlowHedgesBeforeTax" xlink:label="loc_ifrs-full_ReclassificationAdjustmentsOnCashFlowHedgesBeforeTax_3D22632ABD2E4804AAD422F3CEC91886" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract_834EF904FCFDDFB2437422F3CEC5D88E" xlink:to="loc_ifrs-full_ReclassificationAdjustmentsOnCashFlowHedgesBeforeTax_3D22632ABD2E4804AAD422F3CEC91886" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncomeTaxRelatingToCashFlowHedgesOfOtherComprehensiveIncome" xlink:label="loc_ifrs-full_IncomeTaxRelatingToCashFlowHedgesOfOtherComprehensiveIncome_BDDB86E0C693F5DDE65722F3CEC9BF9A" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract_834EF904FCFDDFB2437422F3CEC5D88E" xlink:to="loc_ifrs-full_IncomeTaxRelatingToCashFlowHedgesOfOtherComprehensiveIncome_BDDB86E0C693F5DDE65722F3CEC9BF9A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges_74003DF3EA3885F810B322F3CECAB004" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract_834EF904FCFDDFB2437422F3CEC5D88E" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges_74003DF3EA3885F810B322F3CECAB004" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxAvailableforsaleFinancialAssets" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxAvailableforsaleFinancialAssets_842ABC24038E8B42D02622F3CECA06E1" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract_834EF904FCFDDFB2437422F3CEC5D88E" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxAvailableforsaleFinancialAssets_842ABC24038E8B42D02622F3CECA06E1" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ShareInTheOtherComprehensiveIncomeOfEquityAccountedInvestees" xlink:label="loc_cae_ShareInTheOtherComprehensiveIncomeOfEquityAccountedInvestees_EAC7C7AED01210188C3422F3CECA49C2" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract_834EF904FCFDDFB2437422F3CEC5D88E" xlink:to="loc_cae_ShareInTheOtherComprehensiveIncomeOfEquityAccountedInvestees_EAC7C7AED01210188C3422F3CECA49C2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossValue" xlink:label="loc_cae_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossValue_7A94227AA76E7AB155AF22F3CECB90C4" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract_834EF904FCFDDFB2437422F3CEC5D88E" xlink:to="loc_cae_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossValue_7A94227AA76E7AB155AF22F3CECB90C4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethod" xlink:label="loc_ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_1389B71747D8F86506B622F3CECB12E5" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTaxAbstract_834EF904FCFDDFB2437422F3CEC5D88E" xlink:to="loc_ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_1389B71747D8F86506B622F3CECB12E5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract" xlink:label="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract_444161F58B9E3340BB4922F3CECBD516" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems_8C233AA6382FF8F87F4E22F3CEC49AE5" xlink:to="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract_444161F58B9E3340BB4922F3CECBD516" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans_B7256D7A2609117EBF6222F3CECBE7FF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract_444161F58B9E3340BB4922F3CECBD516" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans_B7256D7A2609117EBF6222F3CECBE7FF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome" xlink:label="loc_ifrs-full_IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome_077D8E024C22C35BCECE22F3CED289AE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract_444161F58B9E3340BB4922F3CECBD516" xlink:to="loc_ifrs-full_IncomeTaxRelatingToRemeasurementsOfDefinedBenefitPlansOfOtherComprehensiveIncome_077D8E024C22C35BCECE22F3CED289AE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax_2DDE85EF16DEF958EBC222F3CED2074F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossBeforeTaxAbstract_444161F58B9E3340BB4922F3CECBD516" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax_2DDE85EF16DEF958EBC222F3CED2074F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherComprehensiveIncome" xlink:label="loc_ifrs-full_OtherComprehensiveIncome_6AE175323E5BE0A6643922F3CED3912E" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems_8C233AA6382FF8F87F4E22F3CEC49AE5" xlink:to="loc_ifrs-full_OtherComprehensiveIncome_6AE175323E5BE0A6643922F3CED3912E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ComprehensiveIncome" xlink:label="loc_ifrs-full_ComprehensiveIncome_EB41D7806C7520A2BFAF22F3CED41330" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems_8C233AA6382FF8F87F4E22F3CEC49AE5" xlink:to="loc_ifrs-full_ComprehensiveIncome_EB41D7806C7520A2BFAF22F3CED41330" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ComprehensiveIncomeAttributableToAbstract" xlink:label="loc_ifrs-full_ComprehensiveIncomeAttributableToAbstract_8E445DE97AEDD851BA3F22F3CED4704C" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems_8C233AA6382FF8F87F4E22F3CEC49AE5" xlink:to="loc_ifrs-full_ComprehensiveIncomeAttributableToAbstract_8E445DE97AEDD851BA3F22F3CED4704C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent" xlink:label="loc_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent_BDEEB50B6D0FA52CF7F622F3CED60658" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComprehensiveIncomeAttributableToAbstract_8E445DE97AEDD851BA3F22F3CED4704C" xlink:to="loc_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent_BDEEB50B6D0FA52CF7F622F3CED60658" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests" xlink:label="loc_ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests_60563B1C86558C6473A222F3CED7BE04" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComprehensiveIncomeAttributableToAbstract_8E445DE97AEDD851BA3F22F3CED4704C" xlink:to="loc_ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests_60563B1C86558C6473A222F3CED7BE04" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ReclassificationAdjustmentsOnExchangeDifferencesOnTranslationBeforeTax" xlink:label="loc_ifrs-full_ReclassificationAdjustmentsOnExchangeDifferencesOnTranslationBeforeTax_5B98AB1458F5425BE89122F7F37D96D9" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems_8C233AA6382FF8F87F4E22F3CEC49AE5" xlink:to="loc_ifrs-full_ReclassificationAdjustmentsOnExchangeDifferencesOnTranslationBeforeTax_5B98AB1458F5425BE89122F7F37D96D9" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/ConsolidatedStatementOfFinancialPosition" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/Contingencies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/ContractsInProgress" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/ContractsInProgressDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/ContractsInProgressTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/DebtFacilities" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/DebtFacilitiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_016930170A0378099624198731F0F8AF" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_341E7E518D0EB68947D7198731ED3E3A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_016930170A0378099624198731F0F8AF" xlink:to="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_341E7E518D0EB68947D7198731ED3E3A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameAxis" xlink:label="loc_ifrs-full_BorrowingsByNameAxis_BB97EC2508307844DBFC198731EE45E4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_341E7E518D0EB68947D7198731ED3E3A" xlink:to="loc_ifrs-full_BorrowingsByNameAxis_BB97EC2508307844DBFC198731EE45E4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="loc_ifrs-full_BorrowingsByNameMember_0CBD2C6488BCD8DBB7BC198731EE1927_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_BB97EC2508307844DBFC198731EE45E4" xlink:to="loc_ifrs-full_BorrowingsByNameMember_0CBD2C6488BCD8DBB7BC198731EE1927_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="loc_ifrs-full_BorrowingsByNameMember_0CBD2C6488BCD8DBB7BC198731EE1927" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_BB97EC2508307844DBFC198731EE45E4" xlink:to="loc_ifrs-full_BorrowingsByNameMember_0CBD2C6488BCD8DBB7BC198731EE1927" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_RevolvingUnsecuredTermCreditFacilitySeptember2022Member" xlink:label="loc_cae_RevolvingUnsecuredTermCreditFacilitySeptember2022Member_0EDF6F7540F14AE64918198731EF1502" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_0CBD2C6488BCD8DBB7BC198731EE1927" xlink:to="loc_cae_RevolvingUnsecuredTermCreditFacilitySeptember2022Member_0EDF6F7540F14AE64918198731EF1502" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LineofCreditFacilityMaximumBorrowingCapacity1" xlink:label="loc_cae_LineofCreditFacilityMaximumBorrowingCapacity1_68D0E63908148EEB3ABA198731F1EBB1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_016930170A0378099624198731F0F8AF" xlink:to="loc_cae_LineofCreditFacilityMaximumBorrowingCapacity1_68D0E63908148EEB3ABA198731F1EBB1" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LineofCreditFacilityMaximumBorrowingCapacityOption" xlink:label="loc_cae_LineofCreditFacilityMaximumBorrowingCapacityOption_D7AA9F11D757EBE1E07A198731F12A90" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_016930170A0378099624198731F0F8AF" xlink:to="loc_cae_LineofCreditFacilityMaximumBorrowingCapacityOption_D7AA9F11D757EBE1E07A198731F12A90" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Borrowings" xlink:label="loc_ifrs-full_Borrowings_48166537AAFEE182BF14198731F2C80A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_016930170A0378099624198731F0F8AF" xlink:to="loc_ifrs-full_Borrowings_48166537AAFEE182BF14198731F2C80A" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/DebtFacilitiesFinancingActivitiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems" xlink:label="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_7A94BEA5140121B0391F22F3C8E2A45B" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesTable" xlink:label="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesTable_7C0671FC4AE9EE5A4F7C22F3C8E0712B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_7A94BEA5140121B0391F22F3C8E2A45B" xlink:to="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesTable_7C0671FC4AE9EE5A4F7C22F3C8E0712B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis" xlink:label="loc_ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis_A7517F53B62020DF93F022F3C8E033EA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesTable_7C0671FC4AE9EE5A4F7C22F3C8E0712B" xlink:to="loc_ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis_A7517F53B62020DF93F022F3C8E033EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesMember" xlink:label="loc_ifrs-full_LiabilitiesArisingFromFinancingActivitiesMember_7A90B93C9198EB3CC76122F3C8E0E7AE_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis_A7517F53B62020DF93F022F3C8E033EA" xlink:to="loc_ifrs-full_LiabilitiesArisingFromFinancingActivitiesMember_7A90B93C9198EB3CC76122F3C8E0E7AE_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivitiesMember" xlink:label="loc_ifrs-full_LiabilitiesArisingFromFinancingActivitiesMember_7A90B93C9198EB3CC76122F3C8E0E7AE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_LiabilitiesArisingFromFinancingActivitiesAxis_A7517F53B62020DF93F022F3C8E033EA" xlink:to="loc_ifrs-full_LiabilitiesArisingFromFinancingActivitiesMember_7A90B93C9198EB3CC76122F3C8E0E7AE" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_RevolvingUnsecuredCreditFacilitiesMember" xlink:label="loc_cae_RevolvingUnsecuredCreditFacilitiesMember_2BA15489C359FAB2DCBA22F3C8E10062" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LiabilitiesArisingFromFinancingActivitiesMember_7A90B93C9198EB3CC76122F3C8E0E7AE" xlink:to="loc_cae_RevolvingUnsecuredCreditFacilitiesMember_2BA15489C359FAB2DCBA22F3C8E10062" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LongtermBorrowingsMember" xlink:label="loc_ifrs-full_LongtermBorrowingsMember_05EC09D7AE1C25D89F9E22F3C8E1F012" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LiabilitiesArisingFromFinancingActivitiesMember_7A90B93C9198EB3CC76122F3C8E0E7AE" xlink:to="loc_ifrs-full_LongtermBorrowingsMember_05EC09D7AE1C25D89F9E22F3C8E1F012" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LeaseLiabilitiesMember" xlink:label="loc_ifrs-full_LeaseLiabilitiesMember_864BB9457A0D266D92A522F3C8E2665B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LiabilitiesArisingFromFinancingActivitiesMember_7A90B93C9198EB3CC76122F3C8E0E7AE" xlink:to="loc_ifrs-full_LeaseLiabilitiesMember_864BB9457A0D266D92A522F3C8E2665B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivities" xlink:label="loc_ifrs-full_LiabilitiesArisingFromFinancingActivities_020FF7201809E46BD82122F3C8E2D6C7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_7A94BEA5140121B0391F22F3C8E2A45B" xlink:to="loc_ifrs-full_LiabilitiesArisingFromFinancingActivities_020FF7201809E46BD82122F3C8E2D6C7" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_IncreaseDecreaseThroughProceedsNetOfTransactionCostsLiabilitiesArisingFromFinancingActivities" xlink:label="loc_cae_IncreaseDecreaseThroughProceedsNetOfTransactionCostsLiabilitiesArisingFromFinancingActivities_24381717C7696A4DA83622F3C8E3F228" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_7A94BEA5140121B0391F22F3C8E2A45B" xlink:to="loc_cae_IncreaseDecreaseThroughProceedsNetOfTransactionCostsLiabilitiesArisingFromFinancingActivities_24381717C7696A4DA83622F3C8E3F228" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_IncreaseDecreaseThroughRepaymentsArisingFromFinancingActivities" xlink:label="loc_cae_IncreaseDecreaseThroughRepaymentsArisingFromFinancingActivities_6289D941BB3E6B29A46022F3C8E3FF91" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_7A94BEA5140121B0391F22F3C8E2A45B" xlink:to="loc_cae_IncreaseDecreaseThroughRepaymentsArisingFromFinancingActivities_6289D941BB3E6B29A46022F3C8E3FF91" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncreaseDecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities_02C48F8F2336CE6CF6FA22F3C8E3C5BB" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_7A94BEA5140121B0391F22F3C8E2A45B" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities_02C48F8F2336CE6CF6FA22F3C8E3C5BB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncreaseDecreaseThroughObtainingOrLosingControlOfSubsidiariesOrOtherBusinessesLiabilitiesArisingFromFinancingActivities" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughObtainingOrLosingControlOfSubsidiariesOrOtherBusinessesLiabilitiesArisingFromFinancingActivities_5D08B761CC6D5209CB0622F3C8E440D1" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_7A94BEA5140121B0391F22F3C8E2A45B" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughObtainingOrLosingControlOfSubsidiariesOrOtherBusinessesLiabilitiesArisingFromFinancingActivities_5D08B761CC6D5209CB0622F3C8E440D1" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EffectofExchangeRateNoncashFinancingActivities" xlink:label="loc_cae_EffectofExchangeRateNoncashFinancingActivities_593A5225A801F54530FD22F3C8E4E45B" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_7A94BEA5140121B0391F22F3C8E2A45B" xlink:to="loc_cae_EffectofExchangeRateNoncashFinancingActivities_593A5225A801F54530FD22F3C8E4E45B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_OtherNoncashFinancingActivities" xlink:label="loc_cae_OtherNoncashFinancingActivities_AAE1C26CED6019FE7BFB22F3C8E5B6E6" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_7A94BEA5140121B0391F22F3C8E2A45B" xlink:to="loc_cae_OtherNoncashFinancingActivities_AAE1C26CED6019FE7BFB22F3C8E5B6E6" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_InterestsNoncashFinancingActivities" xlink:label="loc_cae_InterestsNoncashFinancingActivities_FCFA03D803B36AB1EA0522F3C8E64754" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_7A94BEA5140121B0391F22F3C8E2A45B" xlink:to="loc_cae_InterestsNoncashFinancingActivities_FCFA03D803B36AB1EA0522F3C8E64754" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NoncashFinancingActivities" xlink:label="loc_cae_NoncashFinancingActivities_62B6F5E934CF3642DFFC22F3C8E67AA4" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_7A94BEA5140121B0391F22F3C8E2A45B" xlink:to="loc_cae_NoncashFinancingActivities_62B6F5E934CF3642DFFC22F3C8E67AA4" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/DebtFacilitiesFutureMinimumLeasePaymentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems" xlink:label="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems_B9BADDBA61D6DFEC09FD22F3C8C5A17F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable" xlink:label="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable_F69F55306CDFA8849FC122F3C8C251F1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems_B9BADDBA61D6DFEC09FD22F3C8C5A17F" xlink:to="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable_F69F55306CDFA8849FC122F3C8C251F1" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MaturityAxis" xlink:label="loc_ifrs-full_MaturityAxis_42557514E3D42EEDB9A722F3C8C3540F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable_F69F55306CDFA8849FC122F3C8C251F1" xlink:to="loc_ifrs-full_MaturityAxis_42557514E3D42EEDB9A722F3C8C3540F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="loc_ifrs-full_AggregatedTimeBandsMember_56E08BECAB590C2DE72622F3C8C461E6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MaturityAxis_42557514E3D42EEDB9A722F3C8C3540F" xlink:to="loc_ifrs-full_AggregatedTimeBandsMember_56E08BECAB590C2DE72622F3C8C461E6_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="loc_ifrs-full_AggregatedTimeBandsMember_56E08BECAB590C2DE72622F3C8C461E6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MaturityAxis_42557514E3D42EEDB9A722F3C8C3540F" xlink:to="loc_ifrs-full_AggregatedTimeBandsMember_56E08BECAB590C2DE72622F3C8C461E6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NotLaterThanOneYearMember" xlink:label="loc_ifrs-full_NotLaterThanOneYearMember_BB628F62DCB86327BA7A22F3C8C48F55" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_56E08BECAB590C2DE72622F3C8C461E6" xlink:to="loc_ifrs-full_NotLaterThanOneYearMember_BB628F62DCB86327BA7A22F3C8C48F55" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember" xlink:label="loc_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember_795C58C2B7DF6279E64B22F3C8C553F0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_56E08BECAB590C2DE72622F3C8C461E6" xlink:to="loc_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember_795C58C2B7DF6279E64B22F3C8C553F0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanFiveYearsMember" xlink:label="loc_ifrs-full_LaterThanFiveYearsMember_F148B204C30B99CCFA4022F3C8C5944A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_56E08BECAB590C2DE72622F3C8C461E6" xlink:to="loc_ifrs-full_LaterThanFiveYearsMember_F148B204C30B99CCFA4022F3C8C5944A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MinimumFinanceLeasePaymentsPayable" xlink:label="loc_ifrs-full_MinimumFinanceLeasePaymentsPayable_E63D8AD85F109120C59822F3C8C5F45F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems_B9BADDBA61D6DFEC09FD22F3C8C5A17F" xlink:to="loc_ifrs-full_MinimumFinanceLeasePaymentsPayable_E63D8AD85F109120C59822F3C8C5F45F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FutureFinanceChargeOnFinanceLease" xlink:label="loc_ifrs-full_FutureFinanceChargeOnFinanceLease_847FDC5A33A7BF81FE8722F3C8C63507" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems_B9BADDBA61D6DFEC09FD22F3C8C5A17F" xlink:to="loc_ifrs-full_FutureFinanceChargeOnFinanceLease_847FDC5A33A7BF81FE8722F3C8C63507" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DiscountedGuaranteedResidualValueOfAssetsSubjectToFinanceLease" xlink:label="loc_cae_DiscountedGuaranteedResidualValueOfAssetsSubjectToFinanceLease_F24BDC0C7BEFC72456B522F3C8C7999B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems_B9BADDBA61D6DFEC09FD22F3C8C5A17F" xlink:to="loc_cae_DiscountedGuaranteedResidualValueOfAssetsSubjectToFinanceLease_F24BDC0C7BEFC72456B522F3C8C7999B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MinimumFinanceLeasePaymentsPayableAtPresentValue" xlink:label="loc_ifrs-full_MinimumFinanceLeasePaymentsPayableAtPresentValue_E2C5DC8536D2260E886422F3C8C71FBB" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems_B9BADDBA61D6DFEC09FD22F3C8C5A17F" xlink:to="loc_ifrs-full_MinimumFinanceLeasePaymentsPayableAtPresentValue_E2C5DC8536D2260E886422F3C8C71FBB" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/DebtFacilitiesLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_97353EB4E7EF724D6CBC22F3C9CD507F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_25A56E08FFAC90F68F7322F3C9C79552" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_97353EB4E7EF724D6CBC22F3C9CD507F" xlink:to="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_25A56E08FFAC90F68F7322F3C9C79552" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="cae-20180331.xsd#cae_BorrowingswithRecourseAxis" xlink:label="loc_cae_BorrowingswithRecourseAxis_1084955D6CCDEC72A0F722F3C9C8F56D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_25A56E08FFAC90F68F7322F3C9C79552" xlink:to="loc_cae_BorrowingswithRecourseAxis_1084955D6CCDEC72A0F722F3C9C8F56D" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_BorrowingswithRecourseDomain" xlink:label="loc_cae_BorrowingswithRecourseDomain_5F4C9328A0E19B24617C22F3C9C8369F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_BorrowingswithRecourseAxis_1084955D6CCDEC72A0F722F3C9C8F56D" xlink:to="loc_cae_BorrowingswithRecourseDomain_5F4C9328A0E19B24617C22F3C9C8369F_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_BorrowingswithRecourseDomain" xlink:label="loc_cae_BorrowingswithRecourseDomain_5F4C9328A0E19B24617C22F3C9C8369F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_BorrowingswithRecourseAxis_1084955D6CCDEC72A0F722F3C9C8F56D" xlink:to="loc_cae_BorrowingswithRecourseDomain_5F4C9328A0E19B24617C22F3C9C8369F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_RecourseDebtMember" xlink:label="loc_cae_RecourseDebtMember_E5595D8A03B8B34AD1A222F3C9C9E357" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_BorrowingswithRecourseDomain_5F4C9328A0E19B24617C22F3C9C8369F" xlink:to="loc_cae_RecourseDebtMember_E5595D8A03B8B34AD1A222F3C9C9E357" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NonrecourseDebtMember" xlink:label="loc_cae_NonrecourseDebtMember_1CDC2D145263F4E23B7422F3C9C964D2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_BorrowingswithRecourseDomain_5F4C9328A0E19B24617C22F3C9C8369F" xlink:to="loc_cae_NonrecourseDebtMember_1CDC2D145263F4E23B7422F3C9C964D2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameAxis" xlink:label="loc_ifrs-full_BorrowingsByNameAxis_7CAA45DC60E014602E0922F3C9CA326F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_25A56E08FFAC90F68F7322F3C9C79552" xlink:to="loc_ifrs-full_BorrowingsByNameAxis_7CAA45DC60E014602E0922F3C9CA326F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="loc_ifrs-full_BorrowingsByNameMember_A046C2F64772B05AA4D222F3C9CA896D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_7CAA45DC60E014602E0922F3C9CA326F" xlink:to="loc_ifrs-full_BorrowingsByNameMember_A046C2F64772B05AA4D222F3C9CA896D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="loc_ifrs-full_BorrowingsByNameMember_A046C2F64772B05AA4D222F3C9CA896D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_7CAA45DC60E014602E0922F3C9CA326F" xlink:to="loc_ifrs-full_BorrowingsByNameMember_A046C2F64772B05AA4D222F3C9CA896D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfInterestRatesAxis" xlink:label="loc_ifrs-full_TypesOfInterestRatesAxis_4452BF9D8326DFACE2DE22F3C9CB2FF8" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_25A56E08FFAC90F68F7322F3C9C79552" xlink:to="loc_ifrs-full_TypesOfInterestRatesAxis_4452BF9D8326DFACE2DE22F3C9CB2FF8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InterestRateTypesMember" xlink:label="loc_ifrs-full_InterestRateTypesMember_F91500F4D36CA78D02E922F3C9CC6267_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfInterestRatesAxis_4452BF9D8326DFACE2DE22F3C9CB2FF8" xlink:to="loc_ifrs-full_InterestRateTypesMember_F91500F4D36CA78D02E922F3C9CC6267_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InterestRateTypesMember" xlink:label="loc_ifrs-full_InterestRateTypesMember_F91500F4D36CA78D02E922F3C9CC6267" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfInterestRatesAxis_4452BF9D8326DFACE2DE22F3C9CB2FF8" xlink:to="loc_ifrs-full_InterestRateTypesMember_F91500F4D36CA78D02E922F3C9CC6267" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangeAxis" xlink:label="loc_ifrs-full_RangeAxis_133D3BF2715515BD749422F3C9CC13DB" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_25A56E08FFAC90F68F7322F3C9C79552" xlink:to="loc_ifrs-full_RangeAxis_133D3BF2715515BD749422F3C9CC13DB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="loc_ifrs-full_RangesMember_AE6F14BFD77CBF41FC2D22F3C9CDB018_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_133D3BF2715515BD749422F3C9CC13DB" xlink:to="loc_ifrs-full_RangesMember_AE6F14BFD77CBF41FC2D22F3C9CDB018_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="loc_ifrs-full_RangesMember_AE6F14BFD77CBF41FC2D22F3C9CDB018" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_133D3BF2715515BD749422F3C9CC13DB" xlink:to="loc_ifrs-full_RangesMember_AE6F14BFD77CBF41FC2D22F3C9CDB018" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Borrowings" xlink:label="loc_ifrs-full_Borrowings_439E3AEF80555FC81C1922F3C9CE6145" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_97353EB4E7EF724D6CBC22F3C9CD507F" xlink:to="loc_ifrs-full_Borrowings_439E3AEF80555FC81C1922F3C9CE6145" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LongtermDebtCurrentPortionExcludingCurrentPortionofFinanceLeases" xlink:label="loc_cae_LongtermDebtCurrentPortionExcludingCurrentPortionofFinanceLeases_61727A50BA83BA4EF9DB22F3C9CE0221" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_97353EB4E7EF724D6CBC22F3C9CD507F" xlink:to="loc_cae_LongtermDebtCurrentPortionExcludingCurrentPortionofFinanceLeases_61727A50BA83BA4EF9DB22F3C9CE0221" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LongtermDebtFinanceLeasesCurrentPortion" xlink:label="loc_cae_LongtermDebtFinanceLeasesCurrentPortion_B17ACDFD4BE592783B3822F3C9CF161A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_97353EB4E7EF724D6CBC22F3C9CD507F" xlink:to="loc_cae_LongtermDebtFinanceLeasesCurrentPortion_B17ACDFD4BE592783B3822F3C9CF161A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LongtermBorrowings" xlink:label="loc_ifrs-full_LongtermBorrowings_0070A4C2EB3C8E99087622F3C9CF4FEB" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_97353EB4E7EF724D6CBC22F3C9CD507F" xlink:to="loc_ifrs-full_LongtermBorrowings_0070A4C2EB3C8E99087622F3C9CF4FEB" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/DebtFacilitiesNonRecourseDebtDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_29079A7C74BC9662B03122F3C926A02C" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_E006F70C94C6102A488E22F3C91B3C37" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_29079A7C74BC9662B03122F3C926A02C" xlink:to="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_E006F70C94C6102A488E22F3C91B3C37" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="cae-20180331.xsd#cae_BorrowingswithRecourseAxis" xlink:label="loc_cae_BorrowingswithRecourseAxis_6E9FA18A365EDDFA8AE822F3C91CD511" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_E006F70C94C6102A488E22F3C91B3C37" xlink:to="loc_cae_BorrowingswithRecourseAxis_6E9FA18A365EDDFA8AE822F3C91CD511" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_BorrowingswithRecourseDomain" xlink:label="loc_cae_BorrowingswithRecourseDomain_AFC5D6A8C4600C4A44B722F3C91DECA7_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_BorrowingswithRecourseAxis_6E9FA18A365EDDFA8AE822F3C91CD511" xlink:to="loc_cae_BorrowingswithRecourseDomain_AFC5D6A8C4600C4A44B722F3C91DECA7_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_BorrowingswithRecourseDomain" xlink:label="loc_cae_BorrowingswithRecourseDomain_AFC5D6A8C4600C4A44B722F3C91DECA7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_BorrowingswithRecourseAxis_6E9FA18A365EDDFA8AE822F3C91CD511" xlink:to="loc_cae_BorrowingswithRecourseDomain_AFC5D6A8C4600C4A44B722F3C91DECA7" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NonrecourseDebtMember" xlink:label="loc_cae_NonrecourseDebtMember_F497D23E5CE8226E026922F3C91EF215" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_BorrowingswithRecourseDomain_AFC5D6A8C4600C4A44B722F3C91DECA7" xlink:to="loc_cae_NonrecourseDebtMember_F497D23E5CE8226E026922F3C91EF215" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_VariableRateTypeAxis" xlink:label="loc_cae_VariableRateTypeAxis_DAE65914E50B2802047722F3C91EDFF3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_E006F70C94C6102A488E22F3C91B3C37" xlink:to="loc_cae_VariableRateTypeAxis_DAE65914E50B2802047722F3C91EDFF3" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_VariableRateTypeDomain" xlink:label="loc_cae_VariableRateTypeDomain_598616E9A4BF840B7EC722F3C91FF75C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_VariableRateTypeAxis_DAE65914E50B2802047722F3C91EDFF3" xlink:to="loc_cae_VariableRateTypeDomain_598616E9A4BF840B7EC722F3C91FF75C_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_VariableRateTypeDomain" xlink:label="loc_cae_VariableRateTypeDomain_598616E9A4BF840B7EC722F3C91FF75C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_VariableRateTypeAxis_DAE65914E50B2802047722F3C91EDFF3" xlink:to="loc_cae_VariableRateTypeDomain_598616E9A4BF840B7EC722F3C91FF75C" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LondonInterbankOfferedRateMember" xlink:label="loc_cae_LondonInterbankOfferedRateMember_0DFE721179C2B2FD748E22F3C920E62C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_VariableRateTypeDomain_598616E9A4BF840B7EC722F3C91FF75C" xlink:to="loc_cae_LondonInterbankOfferedRateMember_0DFE721179C2B2FD748E22F3C920E62C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameAxis" xlink:label="loc_ifrs-full_BorrowingsByNameAxis_B62174C2CF656A7519EA22F3C920A11B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_E006F70C94C6102A488E22F3C91B3C37" xlink:to="loc_ifrs-full_BorrowingsByNameAxis_B62174C2CF656A7519EA22F3C920A11B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="loc_ifrs-full_BorrowingsByNameMember_623EFF7ED3F1F818189F22F3C922B7DC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_B62174C2CF656A7519EA22F3C920A11B" xlink:to="loc_ifrs-full_BorrowingsByNameMember_623EFF7ED3F1F818189F22F3C922B7DC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="loc_ifrs-full_BorrowingsByNameMember_623EFF7ED3F1F818189F22F3C922B7DC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_B62174C2CF656A7519EA22F3C920A11B" xlink:to="loc_ifrs-full_BorrowingsByNameMember_623EFF7ED3F1F818189F22F3C922B7DC" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TermLoanBetweenOctober2020andDecember2021Member" xlink:label="loc_cae_TermLoanBetweenOctober2020andDecember2021Member_B114D0F3E528BF3685F522F3C923B251" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_623EFF7ED3F1F818189F22F3C922B7DC" xlink:to="loc_cae_TermLoanBetweenOctober2020andDecember2021Member_B114D0F3E528BF3685F522F3C923B251" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TermLoanApril2018Member" xlink:label="loc_cae_TermLoanApril2018Member_0C13A934C1918340FD4E22F3C9240E16" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_623EFF7ED3F1F818189F22F3C922B7DC" xlink:to="loc_cae_TermLoanApril2018Member_0C13A934C1918340FD4E22F3C9240E16" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TermLoanMarch2028Member" xlink:label="loc_cae_TermLoanMarch2028Member_1044403F38332978F34022F3C9251FF2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_623EFF7ED3F1F818189F22F3C922B7DC" xlink:to="loc_cae_TermLoanMarch2028Member_1044403F38332978F34022F3C9251FF2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TermLoanBetweenJune2021andDecember2025Member" xlink:label="loc_cae_TermLoanBetweenJune2021andDecember2025Member_3E0651FEA3118E91A2B222F3C925559D" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_623EFF7ED3F1F818189F22F3C922B7DC" xlink:to="loc_cae_TermLoanBetweenJune2021andDecember2025Member_3E0651FEA3118E91A2B222F3C925559D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Borrowings" xlink:label="loc_ifrs-full_Borrowings_E125AC2F24156FC4911022F3C926A8F2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_29079A7C74BC9662B03122F3C926A02C" xlink:to="loc_ifrs-full_Borrowings_E125AC2F24156FC4911022F3C926A8F2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NotionalAmount" xlink:label="loc_ifrs-full_NotionalAmount_B994C407EB2CF2E3AC2B22F3C9276C7C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_29079A7C74BC9662B03122F3C926A02C" xlink:to="loc_ifrs-full_NotionalAmount_B994C407EB2CF2E3AC2B22F3C9276C7C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsInterestRate" xlink:label="loc_ifrs-full_BorrowingsInterestRate_88735D16ABBBE5202C0822F3C928872F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_29079A7C74BC9662B03122F3C926A02C" xlink:to="loc_ifrs-full_BorrowingsInterestRate_88735D16ABBBE5202C0822F3C928872F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LineofCreditFacilityMaximumBorrowingCapacity1" xlink:label="loc_cae_LineofCreditFacilityMaximumBorrowingCapacity1_A142FB3F4FA13980B81522F3C92895C3" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_29079A7C74BC9662B03122F3C926A02C" xlink:to="loc_cae_LineofCreditFacilityMaximumBorrowingCapacity1_A142FB3F4FA13980B81522F3C92895C3" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/DebtFacilitiesRecourseDebtDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_0210E2F3118B28A4B3FC22F3C9999730" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_7CB1878D99E4F637E45822F3C9811A5B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_0210E2F3118B28A4B3FC22F3C9999730" xlink:to="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_7CB1878D99E4F637E45822F3C9811A5B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="cae-20180331.xsd#cae_BorrowingswithRecourseAxis" xlink:label="loc_cae_BorrowingswithRecourseAxis_EB3A7B44337AFEF62C9B22F3C982DCB2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_7CB1878D99E4F637E45822F3C9811A5B" xlink:to="loc_cae_BorrowingswithRecourseAxis_EB3A7B44337AFEF62C9B22F3C982DCB2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_BorrowingswithRecourseDomain" xlink:label="loc_cae_BorrowingswithRecourseDomain_D619671B75B48801652F22F3C9833E2C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_BorrowingswithRecourseAxis_EB3A7B44337AFEF62C9B22F3C982DCB2" xlink:to="loc_cae_BorrowingswithRecourseDomain_D619671B75B48801652F22F3C9833E2C_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_BorrowingswithRecourseDomain" xlink:label="loc_cae_BorrowingswithRecourseDomain_D619671B75B48801652F22F3C9833E2C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_BorrowingswithRecourseAxis_EB3A7B44337AFEF62C9B22F3C982DCB2" xlink:to="loc_cae_BorrowingswithRecourseDomain_D619671B75B48801652F22F3C9833E2C" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_RecourseDebtMember" xlink:label="loc_cae_RecourseDebtMember_DC7D7172575FABBEE62F22F3C98689DF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_BorrowingswithRecourseDomain_D619671B75B48801652F22F3C9833E2C" xlink:to="loc_cae_RecourseDebtMember_DC7D7172575FABBEE62F22F3C98689DF" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_VariableRateTypeAxis" xlink:label="loc_cae_VariableRateTypeAxis_0506B079BA8938DC331B22F3C9864B58" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_7CB1878D99E4F637E45822F3C9811A5B" xlink:to="loc_cae_VariableRateTypeAxis_0506B079BA8938DC331B22F3C9864B58" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_VariableRateTypeDomain" xlink:label="loc_cae_VariableRateTypeDomain_F3161797A64A9FE3EDAA22F3C98890B4_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_VariableRateTypeAxis_0506B079BA8938DC331B22F3C9864B58" xlink:to="loc_cae_VariableRateTypeDomain_F3161797A64A9FE3EDAA22F3C98890B4_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_VariableRateTypeDomain" xlink:label="loc_cae_VariableRateTypeDomain_F3161797A64A9FE3EDAA22F3C98890B4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_VariableRateTypeAxis_0506B079BA8938DC331B22F3C9864B58" xlink:to="loc_cae_VariableRateTypeDomain_F3161797A64A9FE3EDAA22F3C98890B4" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EuroInterbankOfferedRateEURIBORMember" xlink:label="loc_cae_EuroInterbankOfferedRateEURIBORMember_7A1B92CF9D0AF938ABB422F3C98934AD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_VariableRateTypeDomain_F3161797A64A9FE3EDAA22F3C98890B4" xlink:to="loc_cae_EuroInterbankOfferedRateEURIBORMember_7A1B92CF9D0AF938ABB422F3C98934AD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangeAxis" xlink:label="loc_ifrs-full_RangeAxis_A4E3D5E367294B58250A22F3C98A685C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_7CB1878D99E4F637E45822F3C9811A5B" xlink:to="loc_ifrs-full_RangeAxis_A4E3D5E367294B58250A22F3C98A685C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="loc_ifrs-full_RangesMember_D10F2E97697CDD60B03122F3C98A7E80_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_A4E3D5E367294B58250A22F3C98A685C" xlink:to="loc_ifrs-full_RangesMember_D10F2E97697CDD60B03122F3C98A7E80_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="loc_ifrs-full_RangesMember_D10F2E97697CDD60B03122F3C98A7E80" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_A4E3D5E367294B58250A22F3C98A685C" xlink:to="loc_ifrs-full_RangesMember_D10F2E97697CDD60B03122F3C98A7E80" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BottomOfRangeMember" xlink:label="loc_ifrs-full_BottomOfRangeMember_71D797E3C86CEB56EB0F22F3C98BC456" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesMember_D10F2E97697CDD60B03122F3C98A7E80" xlink:to="loc_ifrs-full_BottomOfRangeMember_71D797E3C86CEB56EB0F22F3C98BC456" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TopOfRangeMember" xlink:label="loc_ifrs-full_TopOfRangeMember_7774018BBC690EA5F9B822F3C98DA874" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesMember_D10F2E97697CDD60B03122F3C98A7E80" xlink:to="loc_ifrs-full_TopOfRangeMember_7774018BBC690EA5F9B822F3C98DA874" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameAxis" xlink:label="loc_ifrs-full_BorrowingsByNameAxis_0E4E74E6A6EF50C08EF622F3C98D6E67" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_7CB1878D99E4F637E45822F3C9811A5B" xlink:to="loc_ifrs-full_BorrowingsByNameAxis_0E4E74E6A6EF50C08EF622F3C98D6E67" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="loc_ifrs-full_BorrowingsByNameMember_3550E02C986F85E404D322F3C98F34C4_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_0E4E74E6A6EF50C08EF622F3C98D6E67" xlink:to="loc_ifrs-full_BorrowingsByNameMember_3550E02C986F85E404D322F3C98F34C4_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="loc_ifrs-full_BorrowingsByNameMember_3550E02C986F85E404D322F3C98F34C4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_0E4E74E6A6EF50C08EF622F3C98D6E67" xlink:to="loc_ifrs-full_BorrowingsByNameMember_3550E02C986F85E404D322F3C98F34C4" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_UnsecuredSeniorNotesBetween2019andDecember2027Member" xlink:label="loc_cae_UnsecuredSeniorNotesBetween2019andDecember2027Member_CA8A231B0B91582D71D022F3C9910E51" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_3550E02C986F85E404D322F3C98F34C4" xlink:to="loc_cae_UnsecuredSeniorNotesBetween2019andDecember2027Member_CA8A231B0B91582D71D022F3C9910E51" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_UnsecuredSeniorNotesJune2019Member" xlink:label="loc_cae_UnsecuredSeniorNotesJune2019Member_B41390F636A2CFDB279A22F3C9917B4B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_3550E02C986F85E404D322F3C98F34C4" xlink:to="loc_cae_UnsecuredSeniorNotesJune2019Member_B41390F636A2CFDB279A22F3C9917B4B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_UnsecuredSeniorNotesAugust2021Member" xlink:label="loc_cae_UnsecuredSeniorNotesAugust2021Member_3710EA46CA31C09C53C122F3C9929EDB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_3550E02C986F85E404D322F3C98F34C4" xlink:to="loc_cae_UnsecuredSeniorNotesAugust2021Member_3710EA46CA31C09C53C122F3C9929EDB" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_UnsecuredSeniorNotesAugust2026Member" xlink:label="loc_cae_UnsecuredSeniorNotesAugust2026Member_DDFE6EFC356A4997C28B22F3C993D98F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_3550E02C986F85E404D322F3C98F34C4" xlink:to="loc_cae_UnsecuredSeniorNotesAugust2026Member_DDFE6EFC356A4997C28B22F3C993D98F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_UnsecuredSeniorNotesAugust2021andAugust2026Member" xlink:label="loc_cae_UnsecuredSeniorNotesAugust2021andAugust2026Member_74203C416133690E9EAA22F3C994E23D" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_3550E02C986F85E404D322F3C98F34C4" xlink:to="loc_cae_UnsecuredSeniorNotesAugust2021andAugust2026Member_74203C416133690E9EAA22F3C994E23D" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ObligationsUnderFinanceLeaseApril2018toOctober2036Member" xlink:label="loc_cae_ObligationsUnderFinanceLeaseApril2018toOctober2036Member_ABD8B3C5740E0AE6AF2C22F3C9946A14" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_3550E02C986F85E404D322F3C98F34C4" xlink:to="loc_cae_ObligationsUnderFinanceLeaseApril2018toOctober2036Member_ABD8B3C5740E0AE6AF2C22F3C9946A14" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TermLoanJune2018Member" xlink:label="loc_cae_TermLoanJune2018Member_55F92100A7C3EC36BB7222F3C995EEDF" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_3550E02C986F85E404D322F3C98F34C4" xlink:to="loc_cae_TermLoanJune2018Member_55F92100A7C3EC36BB7222F3C995EEDF" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_RDObligationGovernmentAgencyJuly2029Member" xlink:label="loc_cae_RDObligationGovernmentAgencyJuly2029Member_CCA66829778DD5E793C222F3C996501A" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_3550E02C986F85E404D322F3C98F34C4" xlink:to="loc_cae_RDObligationGovernmentAgencyJuly2029Member_CCA66829778DD5E793C222F3C996501A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_RDObligationGovernmentAgencyJuly2035Member" xlink:label="loc_cae_RDObligationGovernmentAgencyJuly2035Member_C5D9C83DE118325E5CCD22F3C99675C7" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_3550E02C986F85E404D322F3C98F34C4" xlink:to="loc_cae_RDObligationGovernmentAgencyJuly2035Member_C5D9C83DE118325E5CCD22F3C99675C7" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TermLoanJanuary2020Member" xlink:label="loc_cae_TermLoanJanuary2020Member_F020956DF4FCEF465F4022F3C997A8B1" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_3550E02C986F85E404D322F3C98F34C4" xlink:to="loc_cae_TermLoanJanuary2020Member_F020956DF4FCEF465F4022F3C997A8B1" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TermLoanBetweenOctober2020andDecember2021Member" xlink:label="loc_cae_TermLoanBetweenOctober2020andDecember2021Member_C1BAB202D4659BEB0C9122F3C997ED4A" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_3550E02C986F85E404D322F3C98F34C4" xlink:to="loc_cae_TermLoanBetweenOctober2020andDecember2021Member_C1BAB202D4659BEB0C9122F3C997ED4A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_OtherDebtMarch2024Member" xlink:label="loc_cae_OtherDebtMarch2024Member_BFB405611A77F14DC1E422F3C99880FC" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_3550E02C986F85E404D322F3C98F34C4" xlink:to="loc_cae_OtherDebtMarch2024Member_BFB405611A77F14DC1E422F3C99880FC" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TermLoanDecember2021Member" xlink:label="loc_cae_TermLoanDecember2021Member_A0A89380BE46E970033022F3C998FC06" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_3550E02C986F85E404D322F3C98F34C4" xlink:to="loc_cae_TermLoanDecember2021Member_A0A89380BE46E970033022F3C998FC06" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Borrowings" xlink:label="loc_ifrs-full_Borrowings_500158800E2229A3E2EA22F3C99C11DA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_0210E2F3118B28A4B3FC22F3C9999730" xlink:to="loc_ifrs-full_Borrowings_500158800E2229A3E2EA22F3C99C11DA" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LineofCreditFacilityMaximumBorrowingCapacity1" xlink:label="loc_cae_LineofCreditFacilityMaximumBorrowingCapacity1_9B8BA9AE2E416E3D207422F3C99DF6FA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_0210E2F3118B28A4B3FC22F3C9999730" xlink:to="loc_cae_LineofCreditFacilityMaximumBorrowingCapacity1_9B8BA9AE2E416E3D207422F3C99DF6FA" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_RDProjectTerm" xlink:label="loc_cae_RDProjectTerm_F51446E9D7DCE8D1CCB622F3C99E973F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_0210E2F3118B28A4B3FC22F3C9999730" xlink:to="loc_cae_RDProjectTerm_F51446E9D7DCE8D1CCB622F3C99E973F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_BorrowingsAggregateAmountRecognized" xlink:label="loc_cae_BorrowingsAggregateAmountRecognized_FBF8AB4E3139888DCC6822F3C99FCCB1" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_0210E2F3118B28A4B3FC22F3C9999730" xlink:to="loc_cae_BorrowingsAggregateAmountRecognized_FBF8AB4E3139888DCC6822F3C99FCCB1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NotionalAmount" xlink:label="loc_ifrs-full_NotionalAmount_8F88531016B6CB1EF19222F3C9A02378" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_0210E2F3118B28A4B3FC22F3C9999730" xlink:to="loc_ifrs-full_NotionalAmount_8F88531016B6CB1EF19222F3C9A02378" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DebtInstrumentBasisSpreadonFloatingInterestRate" xlink:label="loc_cae_DebtInstrumentBasisSpreadonFloatingInterestRate_F8D885B0AD0BE694868022F3C9A1F3F5" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_0210E2F3118B28A4B3FC22F3C9999730" xlink:to="loc_cae_DebtInstrumentBasisSpreadonFloatingInterestRate_F8D885B0AD0BE694868022F3C9A1F3F5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsInterestRate" xlink:label="loc_ifrs-full_BorrowingsInterestRate_00293FD7CAFF138C705522F3C9A188A4" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_0210E2F3118B28A4B3FC22F3C9999730" xlink:to="loc_ifrs-full_BorrowingsInterestRate_00293FD7CAFF138C705522F3C9A188A4" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NotionalAmountRemaining" xlink:label="loc_cae_NotionalAmountRemaining_594242B8A6D41241EEBC22F3C9A25BA2" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_0210E2F3118B28A4B3FC22F3C9999730" xlink:to="loc_cae_NotionalAmountRemaining_594242B8A6D41241EEBC22F3C9A25BA2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CouponRatePostSwapDebt" xlink:label="loc_cae_CouponRatePostSwapDebt_5F9DA6321DD8963532E122F3C9A3A39D" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_0210E2F3118B28A4B3FC22F3C9999730" xlink:to="loc_cae_CouponRatePostSwapDebt_5F9DA6321DD8963532E122F3C9A3A39D" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/DebtFacilitiesRetirementPaymentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems" xlink:label="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems_01A5642BD2E825BD906C22F3C8FF64D5" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable" xlink:label="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable_14CD76783DC4BDAB451E22F3C8FC7C44" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems_01A5642BD2E825BD906C22F3C8FF64D5" xlink:to="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable_14CD76783DC4BDAB451E22F3C8FC7C44" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MaturityAxis" xlink:label="loc_ifrs-full_MaturityAxis_35D3CC25DEA12F056A4422F3C8FC0C13" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeTable_14CD76783DC4BDAB451E22F3C8FC7C44" xlink:to="loc_ifrs-full_MaturityAxis_35D3CC25DEA12F056A4422F3C8FC0C13" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="loc_ifrs-full_AggregatedTimeBandsMember_B483BB7F381C1B96126722F3C8FD0E02_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MaturityAxis_35D3CC25DEA12F056A4422F3C8FC0C13" xlink:to="loc_ifrs-full_AggregatedTimeBandsMember_B483BB7F381C1B96126722F3C8FD0E02_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="loc_ifrs-full_AggregatedTimeBandsMember_B483BB7F381C1B96126722F3C8FD0E02" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MaturityAxis_35D3CC25DEA12F056A4422F3C8FC0C13" xlink:to="loc_ifrs-full_AggregatedTimeBandsMember_B483BB7F381C1B96126722F3C8FD0E02" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NotLaterThanOneYearMember" xlink:label="loc_ifrs-full_NotLaterThanOneYearMember_C80BAAEF595F3087240222F3C8FD5BA4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_B483BB7F381C1B96126722F3C8FD0E02" xlink:to="loc_ifrs-full_NotLaterThanOneYearMember_C80BAAEF595F3087240222F3C8FD5BA4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember" xlink:label="loc_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember_613C477CA27F65D4AF5322F3C8FEA769" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_B483BB7F381C1B96126722F3C8FD0E02" xlink:to="loc_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember_613C477CA27F65D4AF5322F3C8FEA769" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanFiveYearsMember" xlink:label="loc_ifrs-full_LaterThanFiveYearsMember_A69C6BAB1AD18E61A50322F3C8FE3C37" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_B483BB7F381C1B96126722F3C8FD0E02" xlink:to="loc_ifrs-full_LaterThanFiveYearsMember_A69C6BAB1AD18E61A50322F3C8FE3C37" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_RequiredPaymentsRelatedToRetirementProvisionsLongTermDebtGross" xlink:label="loc_cae_RequiredPaymentsRelatedToRetirementProvisionsLongTermDebtGross_7EB2C3D00F78E187790C22F3C90095B6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems_01A5642BD2E825BD906C22F3C8FF64D5" xlink:to="loc_cae_RequiredPaymentsRelatedToRetirementProvisionsLongTermDebtGross_7EB2C3D00F78E187790C22F3C90095B6" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_RequiredPaymentsRelatedToRetirementProvisionsLongTermDebtTransactionCosts" xlink:label="loc_cae_RequiredPaymentsRelatedToRetirementProvisionsLongTermDebtTransactionCosts_16FBA43561F11AE787A222F3C9009384" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems_01A5642BD2E825BD906C22F3C8FF64D5" xlink:to="loc_cae_RequiredPaymentsRelatedToRetirementProvisionsLongTermDebtTransactionCosts_16FBA43561F11AE787A222F3C9009384" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_RequiredPaymentsRelatedToRetirementProvisionsLongTermDebtNet" xlink:label="loc_cae_RequiredPaymentsRelatedToRetirementProvisionsLongTermDebtNet_400B7691E71E0DA62D7722F3C90064C3" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLesseeLineItems_01A5642BD2E825BD906C22F3C8FF64D5" xlink:to="loc_cae_RequiredPaymentsRelatedToRetirementProvisionsLongTermDebtNet_400B7691E71E0DA62D7722F3C90064C3" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/DebtFacilitiesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/DeferredGainsAndOtherNonCurrentLiabilities" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/DeferredGainsAndOtherNonCurrentLiabilitiesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/DeferredGainsAndOtherNonCurrentLiabilitiesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/EmployeeBenefitsObligations" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/EmployeeBenefitsObligationsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDefinedBenefitPlansLineItems" xlink:label="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_7E5C544BD69E51D5A38718C698836E02" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDefinedBenefitPlansTable" xlink:label="loc_ifrs-full_DisclosureOfDefinedBenefitPlansTable_F0A85CD6282A6354441918C6987E3AAC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_7E5C544BD69E51D5A38718C698836E02" xlink:to="loc_ifrs-full_DisclosureOfDefinedBenefitPlansTable_F0A85CD6282A6354441918C6987E3AAC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NetDefinedBenefitLiabilityAssetAxis" xlink:label="loc_ifrs-full_NetDefinedBenefitLiabilityAssetAxis_D63C52CB6B484F27F47518C6987EDD5B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansTable_F0A85CD6282A6354441918C6987E3AAC" xlink:to="loc_ifrs-full_NetDefinedBenefitLiabilityAssetAxis_D63C52CB6B484F27F47518C6987EDD5B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NetDefinedBenefitLiabilityAssetMember" xlink:label="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_7007B3D34443E7DF092918C6987FAC0B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_NetDefinedBenefitLiabilityAssetAxis_D63C52CB6B484F27F47518C6987EDD5B" xlink:to="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_7007B3D34443E7DF092918C6987FAC0B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NetDefinedBenefitLiabilityAssetMember" xlink:label="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_7007B3D34443E7DF092918C6987FAC0B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_NetDefinedBenefitLiabilityAssetAxis_D63C52CB6B484F27F47518C6987EDD5B" xlink:to="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_7007B3D34443E7DF092918C6987FAC0B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PresentValueOfDefinedBenefitObligationMember" xlink:label="loc_ifrs-full_PresentValueOfDefinedBenefitObligationMember_E7776328043C12BBB05218C6987F3063" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_7007B3D34443E7DF092918C6987FAC0B" xlink:to="loc_ifrs-full_PresentValueOfDefinedBenefitObligationMember_E7776328043C12BBB05218C6987F3063" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FundingArrangementsOfDefinedBenefitPlansAxis" xlink:label="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_44B9F6E3C82D29B94F6518C6988091C8" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansTable_F0A85CD6282A6354441918C6987E3AAC" xlink:to="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_44B9F6E3C82D29B94F6518C6988091C8" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FundingArrangementsOfDefinedBenefitPlansDomain" xlink:label="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_7A26490628FFABC01A8718C69880F48E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_44B9F6E3C82D29B94F6518C6988091C8" xlink:to="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_7A26490628FFABC01A8718C69880F48E_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FundingArrangementsOfDefinedBenefitPlansDomain" xlink:label="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_7A26490628FFABC01A8718C69880F48E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_44B9F6E3C82D29B94F6518C6988091C8" xlink:to="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_7A26490628FFABC01A8718C69880F48E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_WhollyUnfundedDefinedBenefitPlansMember" xlink:label="loc_cae_WhollyUnfundedDefinedBenefitPlansMember_7DB26DC1204CD2DEE53718C69881293A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_7A26490628FFABC01A8718C69880F48E" xlink:to="loc_cae_WhollyUnfundedDefinedBenefitPlansMember_7DB26DC1204CD2DEE53718C69881293A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_IncomeStatementLocation1Axis" xlink:label="loc_cae_IncomeStatementLocation1Axis_FAE314C319506732071C18C69881C106" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansTable_F0A85CD6282A6354441918C6987E3AAC" xlink:to="loc_cae_IncomeStatementLocation1Axis_FAE314C319506732071C18C69881C106" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_IncomeStatementLocation1Domain" xlink:label="loc_cae_IncomeStatementLocation1Domain_93CAA7FFF0DC0350A58E18C698818C56_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_IncomeStatementLocation1Axis_FAE314C319506732071C18C69881C106" xlink:to="loc_cae_IncomeStatementLocation1Domain_93CAA7FFF0DC0350A58E18C698818C56_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_IncomeStatementLocation1Domain" xlink:label="loc_cae_IncomeStatementLocation1Domain_93CAA7FFF0DC0350A58E18C698818C56" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_IncomeStatementLocation1Axis_FAE314C319506732071C18C69881C106" xlink:to="loc_cae_IncomeStatementLocation1Domain_93CAA7FFF0DC0350A58E18C698818C56" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CostOfRevenueMember" xlink:label="loc_cae_CostOfRevenueMember_D8E265CAAF3470D72E4418C69882FC61" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_IncomeStatementLocation1Domain_93CAA7FFF0DC0350A58E18C698818C56" xlink:to="loc_cae_CostOfRevenueMember_D8E265CAAF3470D72E4418C69882FC61" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ResearchAndDevelopmentExpensesMember" xlink:label="loc_cae_ResearchAndDevelopmentExpensesMember_AB997798D53A5D4EF10018C698826059" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_IncomeStatementLocation1Domain_93CAA7FFF0DC0350A58E18C698818C56" xlink:to="loc_cae_ResearchAndDevelopmentExpensesMember_AB997798D53A5D4EF10018C698826059" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SellingGeneralAndAdministrativeExpenses1Member" xlink:label="loc_cae_SellingGeneralAndAdministrativeExpenses1Member_D3B86E164C4FB7E36C3D18C69882E564" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_IncomeStatementLocation1Domain_93CAA7FFF0DC0350A58E18C698818C56" xlink:to="loc_cae_SellingGeneralAndAdministrativeExpenses1Member_D3B86E164C4FB7E36C3D18C69882E564" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberOfRegisteredFundedDefinedBenefitPensionPlans" xlink:label="loc_cae_NumberOfRegisteredFundedDefinedBenefitPensionPlans_07798A7AAF1B2EC4ACB218C698834CA0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_7E5C544BD69E51D5A38718C698836E02" xlink:to="loc_cae_NumberOfRegisteredFundedDefinedBenefitPensionPlans_07798A7AAF1B2EC4ACB218C698834CA0" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberOfRegisteredFundedDefinedBenefitPensionPlansForEmployees" xlink:label="loc_cae_NumberOfRegisteredFundedDefinedBenefitPensionPlansForEmployees_DD7EB6FEC3DE57898F0118C6988301EF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_7E5C544BD69E51D5A38718C698836E02" xlink:to="loc_cae_NumberOfRegisteredFundedDefinedBenefitPensionPlansForEmployees_DD7EB6FEC3DE57898F0118C6988301EF" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberOfRegisteredFundedDefinedBenefitPensionPlansForDesignatedExecutives" xlink:label="loc_cae_NumberOfRegisteredFundedDefinedBenefitPensionPlansForDesignatedExecutives_595FBF46075DBF5C557E18C69883D6F3" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_7E5C544BD69E51D5A38718C698836E02" xlink:to="loc_cae_NumberOfRegisteredFundedDefinedBenefitPensionPlansForDesignatedExecutives_595FBF46075DBF5C557E18C69883D6F3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LiabilityAssetOfDefinedBenefitPlans" xlink:label="loc_ifrs-full_LiabilityAssetOfDefinedBenefitPlans_234AE81B4A5CE63C028218C69884C942" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_7E5C544BD69E51D5A38718C698836E02" xlink:to="loc_ifrs-full_LiabilityAssetOfDefinedBenefitPlans_234AE81B4A5CE63C028218C69884C942" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LettersofCreditOutstandingAmount1" xlink:label="loc_cae_LettersofCreditOutstandingAmount1_B560D0DD484CBE7950A818C69884115C" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_7E5C544BD69E51D5A38718C698836E02" xlink:to="loc_cae_LettersofCreditOutstandingAmount1_B560D0DD484CBE7950A818C69884115C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PostemploymentBenefitExpenseDefinedBenefitPlans" xlink:label="loc_ifrs-full_PostemploymentBenefitExpenseDefinedBenefitPlans_2120DFBFDA797321709F18C69884236A" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_7E5C544BD69E51D5A38718C698836E02" xlink:to="loc_ifrs-full_PostemploymentBenefitExpenseDefinedBenefitPlans_2120DFBFDA797321709F18C69884236A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FinanceExpense" xlink:label="loc_cae_FinanceExpense_BE2D8676430E8D75ED5518C698845999" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_7E5C544BD69E51D5A38718C698836E02" xlink:to="loc_cae_FinanceExpense_BE2D8676430E8D75ED5518C698845999" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FinanceCostsCapitalized" xlink:label="loc_cae_FinanceCostsCapitalized_F217A7F153D25920431E18C69885AC05" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_7E5C544BD69E51D5A38718C698836E02" xlink:to="loc_cae_FinanceCostsCapitalized_F217A7F153D25920431E18C69885AC05" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_WeightedAverageDurationOfDefinedBenefitObligationPeriod" xlink:label="loc_cae_WeightedAverageDurationOfDefinedBenefitObligationPeriod_69FE78BA77DA3334D93C18C6988583F5" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_7E5C544BD69E51D5A38718C698836E02" xlink:to="loc_cae_WeightedAverageDurationOfDefinedBenefitObligationPeriod_69FE78BA77DA3334D93C18C6988583F5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PercentageOfReasonablyPossibleIncreaseInActuarialAssumption" xlink:label="loc_ifrs-full_PercentageOfReasonablyPossibleIncreaseInActuarialAssumption_48DDD3E249C86E3F996118C698858FED" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_7E5C544BD69E51D5A38718C698836E02" xlink:to="loc_ifrs-full_PercentageOfReasonablyPossibleIncreaseInActuarialAssumption_48DDD3E249C86E3F996118C698858FED" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/EmployeeBenefitsObligationsEmployeeBenefitObligationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDefinedBenefitPlansLineItems" xlink:label="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_B4A6599D02D2D9704E87BBBFC9F46BFF" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDefinedBenefitPlansTable" xlink:label="loc_ifrs-full_DisclosureOfDefinedBenefitPlansTable_A2CC42E4F02F8011B393BBBFC9F3ED8B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_B4A6599D02D2D9704E87BBBFC9F46BFF" xlink:to="loc_ifrs-full_DisclosureOfDefinedBenefitPlansTable_A2CC42E4F02F8011B393BBBFC9F3ED8B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NetDefinedBenefitLiabilityAssetAxis" xlink:label="loc_ifrs-full_NetDefinedBenefitLiabilityAssetAxis_F9BEE29DBD7EBCA9863ABBBFC9F30CA3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansTable_A2CC42E4F02F8011B393BBBFC9F3ED8B" xlink:to="loc_ifrs-full_NetDefinedBenefitLiabilityAssetAxis_F9BEE29DBD7EBCA9863ABBBFC9F30CA3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NetDefinedBenefitLiabilityAssetMember" xlink:label="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_5F9F30E179137F17B53FBBBFC9F31CF7_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_NetDefinedBenefitLiabilityAssetAxis_F9BEE29DBD7EBCA9863ABBBFC9F30CA3" xlink:to="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_5F9F30E179137F17B53FBBBFC9F31CF7_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NetDefinedBenefitLiabilityAssetMember" xlink:label="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_5F9F30E179137F17B53FBBBFC9F31CF7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_NetDefinedBenefitLiabilityAssetAxis_F9BEE29DBD7EBCA9863ABBBFC9F30CA3" xlink:to="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_5F9F30E179137F17B53FBBBFC9F31CF7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PresentValueOfDefinedBenefitObligationMember" xlink:label="loc_ifrs-full_PresentValueOfDefinedBenefitObligationMember_71F242BF130AB1C833FCBBBFC9F440E7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_5F9F30E179137F17B53FBBBFC9F31CF7" xlink:to="loc_ifrs-full_PresentValueOfDefinedBenefitObligationMember_71F242BF130AB1C833FCBBBFC9F440E7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PlanAssetsMember" xlink:label="loc_ifrs-full_PlanAssetsMember_783D380CD8FDAD5761FBBBBFC9F41DFB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_5F9F30E179137F17B53FBBBFC9F31CF7" xlink:to="loc_ifrs-full_PlanAssetsMember_783D380CD8FDAD5761FBBBBFC9F41DFB" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FundingArrangementsOfDefinedBenefitPlansAxis" xlink:label="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_0753AAEF090A0AEAB4E6BBBFC9F4D7B7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansTable_A2CC42E4F02F8011B393BBBFC9F3ED8B" xlink:to="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_0753AAEF090A0AEAB4E6BBBFC9F4D7B7" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FundingArrangementsOfDefinedBenefitPlansDomain" xlink:label="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_68AD3BC7B3489527C0DABBBFC9F41E32_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_0753AAEF090A0AEAB4E6BBBFC9F4D7B7" xlink:to="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_68AD3BC7B3489527C0DABBBFC9F41E32_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FundingArrangementsOfDefinedBenefitPlansDomain" xlink:label="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_68AD3BC7B3489527C0DABBBFC9F41E32" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_0753AAEF090A0AEAB4E6BBBFC9F4D7B7" xlink:to="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_68AD3BC7B3489527C0DABBBFC9F41E32" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_WhollyOrPartlyFundedDefinedBenefitPlansMember" xlink:label="loc_cae_WhollyOrPartlyFundedDefinedBenefitPlansMember_B866888616B43E6DE919BBBFC9F4AD0F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_68AD3BC7B3489527C0DABBBFC9F41E32" xlink:to="loc_cae_WhollyOrPartlyFundedDefinedBenefitPlansMember_B866888616B43E6DE919BBBFC9F4AD0F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_WhollyUnfundedDefinedBenefitPlansMember" xlink:label="loc_cae_WhollyUnfundedDefinedBenefitPlansMember_E7D0C8AA06CD0BA16672BBBFC9F47190" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_68AD3BC7B3489527C0DABBBFC9F41E32" xlink:to="loc_cae_WhollyUnfundedDefinedBenefitPlansMember_E7D0C8AA06CD0BA16672BBBFC9F47190" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LiabilityAssetOfDefinedBenefitPlans" xlink:label="loc_ifrs-full_LiabilityAssetOfDefinedBenefitPlans_2E621BBEBBE4D2D5FE3ABBBFC9F4F3B7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_B4A6599D02D2D9704E87BBBFC9F46BFF" xlink:to="loc_ifrs-full_LiabilityAssetOfDefinedBenefitPlans_2E621BBEBBE4D2D5FE3ABBBFC9F4F3B7" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/EmployeeBenefitsObligationsExpectedEmployerContributionsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDefinedBenefitPlansLineItems" xlink:label="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_BA36535563C42600CD36BBBFC9ABB422" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDefinedBenefitPlansTable" xlink:label="loc_ifrs-full_DisclosureOfDefinedBenefitPlansTable_4A53D711E59029FA4A4CBBBFC9A9708B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_BA36535563C42600CD36BBBFC9ABB422" xlink:to="loc_ifrs-full_DisclosureOfDefinedBenefitPlansTable_4A53D711E59029FA4A4CBBBFC9A9708B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FundingArrangementsOfDefinedBenefitPlansAxis" xlink:label="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_45DC3EA9FC3788BDB5AFBBBFC9A90A58" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansTable_4A53D711E59029FA4A4CBBBFC9A9708B" xlink:to="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_45DC3EA9FC3788BDB5AFBBBFC9A90A58" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FundingArrangementsOfDefinedBenefitPlansDomain" xlink:label="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_73E4264163D14C577844BBBFC9A989AF_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_45DC3EA9FC3788BDB5AFBBBFC9A90A58" xlink:to="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_73E4264163D14C577844BBBFC9A989AF_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FundingArrangementsOfDefinedBenefitPlansDomain" xlink:label="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_73E4264163D14C577844BBBFC9A989AF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_45DC3EA9FC3788BDB5AFBBBFC9A90A58" xlink:to="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_73E4264163D14C577844BBBFC9A989AF" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_WhollyOrPartlyFundedDefinedBenefitPlansMember" xlink:label="loc_cae_WhollyOrPartlyFundedDefinedBenefitPlansMember_9414564CBB0266CB17D3BBBFC9AA9320" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_73E4264163D14C577844BBBFC9A989AF" xlink:to="loc_cae_WhollyOrPartlyFundedDefinedBenefitPlansMember_9414564CBB0266CB17D3BBBFC9AA9320" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_WhollyUnfundedDefinedBenefitPlansMember" xlink:label="loc_cae_WhollyUnfundedDefinedBenefitPlansMember_4593C7239F4BDB592876BBBFC9AA8D9A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_73E4264163D14C577844BBBFC9A989AF" xlink:to="loc_cae_WhollyUnfundedDefinedBenefitPlansMember_4593C7239F4BDB592876BBBFC9AA8D9A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DefinedBenefitPlansAxis" xlink:label="loc_ifrs-full_DefinedBenefitPlansAxis_1C764B44E9F512C79A4FBBBFC9AA1CD4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansTable_4A53D711E59029FA4A4CBBBFC9A9708B" xlink:to="loc_ifrs-full_DefinedBenefitPlansAxis_1C764B44E9F512C79A4FBBBFC9AA1CD4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DefinedBenefitPlansMember" xlink:label="loc_ifrs-full_DefinedBenefitPlansMember_F322D1C4F2EADB4420BDBBBFC9AB5053_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_DefinedBenefitPlansAxis_1C764B44E9F512C79A4FBBBFC9AA1CD4" xlink:to="loc_ifrs-full_DefinedBenefitPlansMember_F322D1C4F2EADB4420BDBBBFC9AB5053_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DefinedBenefitPlansMember" xlink:label="loc_ifrs-full_DefinedBenefitPlansMember_F322D1C4F2EADB4420BDBBBFC9AB5053" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_DefinedBenefitPlansAxis_1C764B44E9F512C79A4FBBBFC9AA1CD4" xlink:to="loc_ifrs-full_DefinedBenefitPlansMember_F322D1C4F2EADB4420BDBBBFC9AB5053" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DomesticDefinedBenefitPlansMember" xlink:label="loc_ifrs-full_DomesticDefinedBenefitPlansMember_11259942CF520B3770FFBBBFC9AB1DBD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DefinedBenefitPlansMember_F322D1C4F2EADB4420BDBBBFC9AB5053" xlink:to="loc_ifrs-full_DomesticDefinedBenefitPlansMember_11259942CF520B3770FFBBBFC9AB1DBD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ForeignDefinedBenefitPlansMember" xlink:label="loc_ifrs-full_ForeignDefinedBenefitPlansMember_602584BEC681600FA146BBBFC9AB04AC" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DefinedBenefitPlansMember_F322D1C4F2EADB4420BDBBBFC9AB5053" xlink:to="loc_ifrs-full_ForeignDefinedBenefitPlansMember_602584BEC681600FA146BBBFC9AB04AC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EstimateOfContributionsExpectedToBePaidToPlan" xlink:label="loc_ifrs-full_EstimateOfContributionsExpectedToBePaidToPlan_7B28B30A91C0BE14F511BBBFC9ABAFF3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_BA36535563C42600CD36BBBFC9ABB422" xlink:to="loc_ifrs-full_EstimateOfContributionsExpectedToBePaidToPlan_7B28B30A91C0BE14F511BBBFC9ABAFF3" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/EmployeeBenefitsObligationsFutureMortalityRateDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems" xlink:label="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems_92AFC422EF50362BD0C322F3C78CFD02" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable" xlink:label="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable_5CB4839014BD9925400C22F3C78604C9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems_92AFC422EF50362BD0C322F3C78CFD02" xlink:to="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable_5CB4839014BD9925400C22F3C78604C9" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="cae-20180331.xsd#cae_GenderAxis" xlink:label="loc_cae_GenderAxis_C894E51F1E5428E0729B22F3C7864EF0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable_5CB4839014BD9925400C22F3C78604C9" xlink:to="loc_cae_GenderAxis_C894E51F1E5428E0729B22F3C7864EF0" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_GenderDomain" xlink:label="loc_cae_GenderDomain_4F9101765670EE8B222622F3C787B150_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_GenderAxis_C894E51F1E5428E0729B22F3C7864EF0" xlink:to="loc_cae_GenderDomain_4F9101765670EE8B222622F3C787B150_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_GenderDomain" xlink:label="loc_cae_GenderDomain_4F9101765670EE8B222622F3C787B150" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_GenderAxis_C894E51F1E5428E0729B22F3C7864EF0" xlink:to="loc_cae_GenderDomain_4F9101765670EE8B222622F3C787B150" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_MaleMember" xlink:label="loc_cae_MaleMember_296244F62CF6756A3C8422F3C787E047" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_GenderDomain_4F9101765670EE8B222622F3C787B150" xlink:to="loc_cae_MaleMember_296244F62CF6756A3C8422F3C787E047" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FemaleMember" xlink:label="loc_cae_FemaleMember_4E6177AFF59892E5567622F3C787A375" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_GenderDomain_4F9101765670EE8B222622F3C787B150" xlink:to="loc_cae_FemaleMember_4E6177AFF59892E5567622F3C787A375" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LifeExpectancyRangeAxis" xlink:label="loc_cae_LifeExpectancyRangeAxis_138D29A34F7E48AA717F22F3C7878CD9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable_5CB4839014BD9925400C22F3C78604C9" xlink:to="loc_cae_LifeExpectancyRangeAxis_138D29A34F7E48AA717F22F3C7878CD9" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LifeexpectancyrangeDomain" xlink:label="loc_cae_LifeexpectancyrangeDomain_B994FD316DDC78E5F02A22F3C787523A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_LifeExpectancyRangeAxis_138D29A34F7E48AA717F22F3C7878CD9" xlink:to="loc_cae_LifeexpectancyrangeDomain_B994FD316DDC78E5F02A22F3C787523A_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LifeexpectancyrangeDomain" xlink:label="loc_cae_LifeexpectancyrangeDomain_B994FD316DDC78E5F02A22F3C787523A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_LifeExpectancyRangeAxis_138D29A34F7E48AA717F22F3C7878CD9" xlink:to="loc_cae_LifeexpectancyrangeDomain_B994FD316DDC78E5F02A22F3C787523A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LifeExpectancyatAge45Member" xlink:label="loc_cae_LifeExpectancyatAge45Member_7A22529DF7F285FD9E6322F3C788670A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_LifeexpectancyrangeDomain_B994FD316DDC78E5F02A22F3C787523A" xlink:to="loc_cae_LifeExpectancyatAge45Member_7A22529DF7F285FD9E6322F3C788670A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LifeExpectancyatAge65Member" xlink:label="loc_cae_LifeExpectancyatAge65Member_650A6127F7E47DCD0F0B22F3C7881304" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_LifeexpectancyrangeDomain_B994FD316DDC78E5F02A22F3C787523A" xlink:to="loc_cae_LifeExpectancyatAge65Member_650A6127F7E47DCD0F0B22F3C7881304" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GeographicalAreasAxis" xlink:label="loc_ifrs-full_GeographicalAreasAxis_E177B499E3AE808C842622F3C788BADC" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable_5CB4839014BD9925400C22F3C78604C9" xlink:to="loc_ifrs-full_GeographicalAreasAxis_E177B499E3AE808C842622F3C788BADC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GeographicalAreasMember" xlink:label="loc_ifrs-full_GeographicalAreasMember_4CF84A3B759B2C4F2B8A22F3C788B32E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_GeographicalAreasAxis_E177B499E3AE808C842622F3C788BADC" xlink:to="loc_ifrs-full_GeographicalAreasMember_4CF84A3B759B2C4F2B8A22F3C788B32E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GeographicalAreasMember" xlink:label="loc_ifrs-full_GeographicalAreasMember_4CF84A3B759B2C4F2B8A22F3C788B32E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_GeographicalAreasAxis_E177B499E3AE808C842622F3C788BADC" xlink:to="loc_ifrs-full_GeographicalAreasMember_4CF84A3B759B2C4F2B8A22F3C788B32E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CountryOfDomicileMember" xlink:label="loc_ifrs-full_CountryOfDomicileMember_68964487DCF04F069E8722F3C7893F74" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_4CF84A3B759B2C4F2B8A22F3C788B32E" xlink:to="loc_ifrs-full_CountryOfDomicileMember_68964487DCF04F069E8722F3C7893F74" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_NL" xlink:label="loc_country_NL_8A017D535653B82179DE22F3C789B276" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_4CF84A3B759B2C4F2B8A22F3C788B32E" xlink:to="loc_country_NL_8A017D535653B82179DE22F3C789B276" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_DE" xlink:label="loc_country_DE_FA4A68720B156653D8A022F3C78918E2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_4CF84A3B759B2C4F2B8A22F3C788B32E" xlink:to="loc_country_DE_FA4A68720B156653D8A022F3C78918E2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_NO" xlink:label="loc_country_NO_F01A5EFA252CBF40A12222F3C789EB3F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_4CF84A3B759B2C4F2B8A22F3C788B32E" xlink:to="loc_country_NO_F01A5EFA252CBF40A12222F3C789EB3F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_GB" xlink:label="loc_country_GB_1069D3B2AE78B946472E22F3C78A416F" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_4CF84A3B759B2C4F2B8A22F3C788B32E" xlink:to="loc_country_GB_1069D3B2AE78B946472E22F3C78A416F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ActuarialAssumptionsAxis" xlink:label="loc_ifrs-full_ActuarialAssumptionsAxis_F650A90E3A0BFA2B57EF22F3C78A132F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable_5CB4839014BD9925400C22F3C78604C9" xlink:to="loc_ifrs-full_ActuarialAssumptionsAxis_F650A90E3A0BFA2B57EF22F3C78A132F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ActuarialAssumptionsMember" xlink:label="loc_ifrs-full_ActuarialAssumptionsMember_592BD8785754D1D78EC922F3C78A2189_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ActuarialAssumptionsAxis_F650A90E3A0BFA2B57EF22F3C78A132F" xlink:to="loc_ifrs-full_ActuarialAssumptionsMember_592BD8785754D1D78EC922F3C78A2189_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ActuarialAssumptionsMember" xlink:label="loc_ifrs-full_ActuarialAssumptionsMember_592BD8785754D1D78EC922F3C78A2189" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ActuarialAssumptionsAxis_F650A90E3A0BFA2B57EF22F3C78A132F" xlink:to="loc_ifrs-full_ActuarialAssumptionsMember_592BD8785754D1D78EC922F3C78A2189" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CPMprivatetablesemployeesMember" xlink:label="loc_cae_CPMprivatetablesemployeesMember_A7F400F1DAE42F53CD3722F3C78ACECA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ActuarialAssumptionsMember_592BD8785754D1D78EC922F3C78A2189" xlink:to="loc_cae_CPMprivatetablesemployeesMember_A7F400F1DAE42F53CD3722F3C78ACECA" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CPMprivatetablesdesignatedexecutivesMember" xlink:label="loc_cae_CPMprivatetablesdesignatedexecutivesMember_ADD435BA69DB06332D4322F3C78A8CF4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ActuarialAssumptionsMember_592BD8785754D1D78EC922F3C78A2189" xlink:to="loc_cae_CPMprivatetablesdesignatedexecutivesMember_ADD435BA69DB06332D4322F3C78A8CF4" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CPMprivatetablesCMATMember" xlink:label="loc_cae_CPMprivatetablesCMATMember_7FE227C1EB1F233FCB0A22F3C78B530E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ActuarialAssumptionsMember_592BD8785754D1D78EC922F3C78A2189" xlink:to="loc_cae_CPMprivatetablesCMATMember_7FE227C1EB1F233FCB0A22F3C78B530E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AG2016Member" xlink:label="loc_cae_AG2016Member_036CD6138101FEC7C8FC22F3C78BE9A6" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ActuarialAssumptionsMember_592BD8785754D1D78EC922F3C78A2189" xlink:to="loc_cae_AG2016Member_036CD6138101FEC7C8FC22F3C78BE9A6" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_HeubeckRT2005GMember" xlink:label="loc_cae_HeubeckRT2005GMember_B24D622E281DBF9C715B22F3C78BEF32" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ActuarialAssumptionsMember_592BD8785754D1D78EC922F3C78A2189" xlink:to="loc_cae_HeubeckRT2005GMember_B24D622E281DBF9C715B22F3C78BEF32" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_K2013Member" xlink:label="loc_cae_K2013Member_68E79522D5FF1FFA882B22F3C78B9A87" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ActuarialAssumptionsMember_592BD8785754D1D78EC922F3C78A2189" xlink:to="loc_cae_K2013Member_68E79522D5FF1FFA882B22F3C78B9A87" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_S1PAMember" xlink:label="loc_cae_S1PAMember_B9AE5755AAF2A33EB5ED22F3C78BA3ED" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ActuarialAssumptionsMember_592BD8785754D1D78EC922F3C78A2189" xlink:to="loc_cae_S1PAMember_B9AE5755AAF2A33EB5ED22F3C78BA3ED" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ActuarialAssumptionOfLifeExpectancyAfterRetirement" xlink:label="loc_ifrs-full_ActuarialAssumptionOfLifeExpectancyAfterRetirement_C253A390F75B22C43CA722F3C78CC672" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems_92AFC422EF50362BD0C322F3C78CFD02" xlink:to="loc_ifrs-full_ActuarialAssumptionOfLifeExpectancyAfterRetirement_C253A390F75B22C43CA722F3C78CC672" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/EmployeeBenefitsObligationsMovementInDefinedBenefitPensionObligationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems" xlink:label="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_ECEF78CC798DD01F060423E8D225C2C9" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetTable" xlink:label="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetTable_FFC15F29F09FEA05B12023E8D2198512" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_ECEF78CC798DD01F060423E8D225C2C9" xlink:to="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetTable_FFC15F29F09FEA05B12023E8D2198512" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FundingArrangementsOfDefinedBenefitPlansAxis" xlink:label="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_7E363B6642E0A320D06023E8D21AFA10" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetTable_FFC15F29F09FEA05B12023E8D2198512" xlink:to="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_7E363B6642E0A320D06023E8D21AFA10" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FundingArrangementsOfDefinedBenefitPlansDomain" xlink:label="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_8E148124436BEAB030C623E8D21AE659_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_7E363B6642E0A320D06023E8D21AFA10" xlink:to="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_8E148124436BEAB030C623E8D21AE659_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FundingArrangementsOfDefinedBenefitPlansDomain" xlink:label="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_8E148124436BEAB030C623E8D21AE659" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_7E363B6642E0A320D06023E8D21AFA10" xlink:to="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_8E148124436BEAB030C623E8D21AE659" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_WhollyOrPartlyFundedDefinedBenefitPlansMember" xlink:label="loc_cae_WhollyOrPartlyFundedDefinedBenefitPlansMember_B51E1B773D0DBC7ECDB123E8D21BDFB6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_8E148124436BEAB030C623E8D21AE659" xlink:to="loc_cae_WhollyOrPartlyFundedDefinedBenefitPlansMember_B51E1B773D0DBC7ECDB123E8D21BDFB6" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_WhollyUnfundedDefinedBenefitPlansMember" xlink:label="loc_cae_WhollyUnfundedDefinedBenefitPlansMember_BC5ADBAED9E45B7985AA23E8D220CA7C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_8E148124436BEAB030C623E8D21AE659" xlink:to="loc_cae_WhollyUnfundedDefinedBenefitPlansMember_BC5ADBAED9E45B7985AA23E8D220CA7C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DefinedBenefitPlansAxis" xlink:label="loc_ifrs-full_DefinedBenefitPlansAxis_C34F31157E55DBF7EDF823E8D2215E69" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetTable_FFC15F29F09FEA05B12023E8D2198512" xlink:to="loc_ifrs-full_DefinedBenefitPlansAxis_C34F31157E55DBF7EDF823E8D2215E69" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DefinedBenefitPlansMember" xlink:label="loc_ifrs-full_DefinedBenefitPlansMember_AF2DCB4D2D5104EE7F2C23E8D221FB8A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_DefinedBenefitPlansAxis_C34F31157E55DBF7EDF823E8D2215E69" xlink:to="loc_ifrs-full_DefinedBenefitPlansMember_AF2DCB4D2D5104EE7F2C23E8D221FB8A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DefinedBenefitPlansMember" xlink:label="loc_ifrs-full_DefinedBenefitPlansMember_AF2DCB4D2D5104EE7F2C23E8D221FB8A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_DefinedBenefitPlansAxis_C34F31157E55DBF7EDF823E8D2215E69" xlink:to="loc_ifrs-full_DefinedBenefitPlansMember_AF2DCB4D2D5104EE7F2C23E8D221FB8A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DomesticDefinedBenefitPlansMember" xlink:label="loc_ifrs-full_DomesticDefinedBenefitPlansMember_CA485E7012915836AC9D23E8D2213CDF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DefinedBenefitPlansMember_AF2DCB4D2D5104EE7F2C23E8D221FB8A" xlink:to="loc_ifrs-full_DomesticDefinedBenefitPlansMember_CA485E7012915836AC9D23E8D2213CDF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ForeignDefinedBenefitPlansMember" xlink:label="loc_ifrs-full_ForeignDefinedBenefitPlansMember_0B5C33C0E7DEBF9DBDA623E8D2226315" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DefinedBenefitPlansMember_AF2DCB4D2D5104EE7F2C23E8D221FB8A" xlink:to="loc_ifrs-full_ForeignDefinedBenefitPlansMember_0B5C33C0E7DEBF9DBDA623E8D2226315" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NetDefinedBenefitLiabilityAssetAxis" xlink:label="loc_ifrs-full_NetDefinedBenefitLiabilityAssetAxis_DFDD31845E6C833D3EB723E8D2227AD4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetTable_FFC15F29F09FEA05B12023E8D2198512" xlink:to="loc_ifrs-full_NetDefinedBenefitLiabilityAssetAxis_DFDD31845E6C833D3EB723E8D2227AD4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NetDefinedBenefitLiabilityAssetMember" xlink:label="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_D8DD973081C6226A968023E8D222D5C3_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_NetDefinedBenefitLiabilityAssetAxis_DFDD31845E6C833D3EB723E8D2227AD4" xlink:to="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_D8DD973081C6226A968023E8D222D5C3_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NetDefinedBenefitLiabilityAssetMember" xlink:label="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_D8DD973081C6226A968023E8D222D5C3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_NetDefinedBenefitLiabilityAssetAxis_DFDD31845E6C833D3EB723E8D2227AD4" xlink:to="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_D8DD973081C6226A968023E8D222D5C3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PresentValueOfDefinedBenefitObligationMember" xlink:label="loc_ifrs-full_PresentValueOfDefinedBenefitObligationMember_242E9659A1E31647933523E8D223B8FF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_D8DD973081C6226A968023E8D222D5C3" xlink:to="loc_ifrs-full_PresentValueOfDefinedBenefitObligationMember_242E9659A1E31647933523E8D223B8FF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PlanAssetsMember" xlink:label="loc_ifrs-full_PlanAssetsMember_B93915B3B864399CAF1923E8D224869B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_D8DD973081C6226A968023E8D222D5C3" xlink:to="loc_ifrs-full_PlanAssetsMember_B93915B3B864399CAF1923E8D224869B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LiabilityAssetOfDefinedBenefitPlans" xlink:label="loc_ifrs-full_LiabilityAssetOfDefinedBenefitPlans_83525FE35B27C08B383423E8D226B5FB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_ECEF78CC798DD01F060423E8D225C2C9" xlink:to="loc_ifrs-full_LiabilityAssetOfDefinedBenefitPlans_83525FE35B27C08B383423E8D226B5FB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CurrentServiceCostNetDefinedBenefitLiabilityAsset" xlink:label="loc_ifrs-full_CurrentServiceCostNetDefinedBenefitLiabilityAsset_5C88ABC6DB624807CF5523E8D226D010" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_ECEF78CC798DD01F060423E8D225C2C9" xlink:to="loc_ifrs-full_CurrentServiceCostNetDefinedBenefitLiabilityAsset_5C88ABC6DB624807CF5523E8D226D010" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InterestExpenseIncomeNetDefinedBenefitLiabilityAsset" xlink:label="loc_ifrs-full_InterestExpenseIncomeNetDefinedBenefitLiabilityAsset_7B0CCAEE313749E45FF023E8D2278426" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_ECEF78CC798DD01F060423E8D225C2C9" xlink:to="loc_ifrs-full_InterestExpenseIncomeNetDefinedBenefitLiabilityAsset_7B0CCAEE313749E45FF023E8D2278426" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PastServiceCostAndGainsLossesArisingFromSettlementsNetDefinedBenefitLiabilityAsset" xlink:label="loc_ifrs-full_PastServiceCostAndGainsLossesArisingFromSettlementsNetDefinedBenefitLiabilityAsset_3EE12D6C5D833A3F871023E8D227504C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_ECEF78CC798DD01F060423E8D225C2C9" xlink:to="loc_ifrs-full_PastServiceCostAndGainsLossesArisingFromSettlementsNetDefinedBenefitLiabilityAsset_3EE12D6C5D833A3F871023E8D227504C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAssetAbstract" xlink:label="loc_ifrs-full_GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAssetAbstract_04A0915B97F552BE536A23E8D227F2AC" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_ECEF78CC798DD01F060423E8D225C2C9" xlink:to="loc_ifrs-full_GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAssetAbstract_04A0915B97F552BE536A23E8D227F2AC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ActuarialGainsLossesArisingFromExperienceAdjustmentsNetDefinedBenefitLiabilityAsset" xlink:label="loc_ifrs-full_ActuarialGainsLossesArisingFromExperienceAdjustmentsNetDefinedBenefitLiabilityAsset_D2C02561D4FE031DEAA923E8D22D3877" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAssetAbstract_04A0915B97F552BE536A23E8D227F2AC" xlink:to="loc_ifrs-full_ActuarialGainsLossesArisingFromExperienceAdjustmentsNetDefinedBenefitLiabilityAsset_D2C02561D4FE031DEAA923E8D22D3877" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ActuarialGainsLossesArisingFromChangesInFinancialAssumptionsNetDefinedBenefitLiabilityAsset" xlink:label="loc_ifrs-full_ActuarialGainsLossesArisingFromChangesInFinancialAssumptionsNetDefinedBenefitLiabilityAsset_7376DE1A049C95FE462423E8D22E1D3C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAssetAbstract_04A0915B97F552BE536A23E8D227F2AC" xlink:to="loc_ifrs-full_ActuarialGainsLossesArisingFromChangesInFinancialAssumptionsNetDefinedBenefitLiabilityAsset_7376DE1A049C95FE462423E8D22E1D3C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset" xlink:label="loc_ifrs-full_ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset_6B207C8318762C60003D23E8D22E9E1F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GainLossOnRemeasurementOfNetDefinedBenefitLiabilityAssetAbstract_04A0915B97F552BE536A23E8D227F2AC" xlink:to="loc_ifrs-full_ActuarialGainsLossesArisingFromChangesInDemographicAssumptionsNetDefinedBenefitLiabilityAsset_6B207C8318762C60003D23E8D22E9E1F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ReturnOnPlanAssetsNetDefinedBenefitLiabilityAsset" xlink:label="loc_ifrs-full_ReturnOnPlanAssetsNetDefinedBenefitLiabilityAsset_93553B9C65C64AFD830423E8D22F1A16" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_ECEF78CC798DD01F060423E8D225C2C9" xlink:to="loc_ifrs-full_ReturnOnPlanAssetsNetDefinedBenefitLiabilityAsset_93553B9C65C64AFD830423E8D22F1A16" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ContributionsToPlanByPlanParticipantsNetDefinedBenefitLiabilityAsset" xlink:label="loc_ifrs-full_ContributionsToPlanByPlanParticipantsNetDefinedBenefitLiabilityAsset_B7585B147D4F50C49BEA23E8D22F3040" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_ECEF78CC798DD01F060423E8D225C2C9" xlink:to="loc_ifrs-full_ContributionsToPlanByPlanParticipantsNetDefinedBenefitLiabilityAsset_B7585B147D4F50C49BEA23E8D22F3040" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ContributionsToPlanByEmployerNetDefinedBenefitLiabilityAsset" xlink:label="loc_ifrs-full_ContributionsToPlanByEmployerNetDefinedBenefitLiabilityAsset_59B995F19DD5C305A14623E8D22FFB36" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_ECEF78CC798DD01F060423E8D225C2C9" xlink:to="loc_ifrs-full_ContributionsToPlanByEmployerNetDefinedBenefitLiabilityAsset_59B995F19DD5C305A14623E8D22FFB36" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PaymentsFromPlanNetDefinedBenefitLiabilityAsset" xlink:label="loc_ifrs-full_PaymentsFromPlanNetDefinedBenefitLiabilityAsset_D9C87AF8CFD058D6128623E8D2309C53" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_ECEF78CC798DD01F060423E8D225C2C9" xlink:to="loc_ifrs-full_PaymentsFromPlanNetDefinedBenefitLiabilityAsset_D9C87AF8CFD058D6128623E8D2309C53" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AdministrativeExpensesNetDefinedBenefitLiabilityAsset" xlink:label="loc_cae_AdministrativeExpensesNetDefinedBenefitLiabilityAsset_1A6EC2E9E58DB863334123E8D230C746" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_ECEF78CC798DD01F060423E8D225C2C9" xlink:to="loc_cae_AdministrativeExpensesNetDefinedBenefitLiabilityAsset_1A6EC2E9E58DB863334123E8D230C746" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncreaseDecreaseThroughChangesInForeignExchangeRatesNetDefinedBenefitLiabilityAsset" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughChangesInForeignExchangeRatesNetDefinedBenefitLiabilityAsset_578C4574DA6DE958FA3523E8D23133E8" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_ECEF78CC798DD01F060423E8D225C2C9" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughChangesInForeignExchangeRatesNetDefinedBenefitLiabilityAsset_578C4574DA6DE958FA3523E8D23133E8" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/EmployeeBenefitsObligationsNetPeriodicCostsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems" xlink:label="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_C0E5D7F403342C5FF5D818C6984B4A25" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetTable" xlink:label="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetTable_D97A2047DFE7BE31822118C69847EDBF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_C0E5D7F403342C5FF5D818C6984B4A25" xlink:to="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetTable_D97A2047DFE7BE31822118C69847EDBF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FundingArrangementsOfDefinedBenefitPlansAxis" xlink:label="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_6F7BFDC6465025C00A4018C69848DFA9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetTable_D97A2047DFE7BE31822118C69847EDBF" xlink:to="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_6F7BFDC6465025C00A4018C69848DFA9" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FundingArrangementsOfDefinedBenefitPlansDomain" xlink:label="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_0EB394D5E4A10A1D36F118C69848D82D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_6F7BFDC6465025C00A4018C69848DFA9" xlink:to="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_0EB394D5E4A10A1D36F118C69848D82D_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FundingArrangementsOfDefinedBenefitPlansDomain" xlink:label="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_0EB394D5E4A10A1D36F118C69848D82D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_6F7BFDC6465025C00A4018C69848DFA9" xlink:to="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_0EB394D5E4A10A1D36F118C69848D82D" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_WhollyOrPartlyFundedDefinedBenefitPlansMember" xlink:label="loc_cae_WhollyOrPartlyFundedDefinedBenefitPlansMember_51B5C650E8D5810BA84C18C69848BAC1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_0EB394D5E4A10A1D36F118C69848D82D" xlink:to="loc_cae_WhollyOrPartlyFundedDefinedBenefitPlansMember_51B5C650E8D5810BA84C18C69848BAC1" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_WhollyUnfundedDefinedBenefitPlansMember" xlink:label="loc_cae_WhollyUnfundedDefinedBenefitPlansMember_DA906D1CF83F7DA9E07918C69849EC39" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_0EB394D5E4A10A1D36F118C69848D82D" xlink:to="loc_cae_WhollyUnfundedDefinedBenefitPlansMember_DA906D1CF83F7DA9E07918C69849EC39" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DefinedBenefitPlansAxis" xlink:label="loc_ifrs-full_DefinedBenefitPlansAxis_409A3E7E0673AA0F2BB518C698497A20" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetTable_D97A2047DFE7BE31822118C69847EDBF" xlink:to="loc_ifrs-full_DefinedBenefitPlansAxis_409A3E7E0673AA0F2BB518C698497A20" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DefinedBenefitPlansMember" xlink:label="loc_ifrs-full_DefinedBenefitPlansMember_F2FEC5D90C71D665BC2718C69849ED0E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_DefinedBenefitPlansAxis_409A3E7E0673AA0F2BB518C698497A20" xlink:to="loc_ifrs-full_DefinedBenefitPlansMember_F2FEC5D90C71D665BC2718C69849ED0E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DefinedBenefitPlansMember" xlink:label="loc_ifrs-full_DefinedBenefitPlansMember_F2FEC5D90C71D665BC2718C69849ED0E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_DefinedBenefitPlansAxis_409A3E7E0673AA0F2BB518C698497A20" xlink:to="loc_ifrs-full_DefinedBenefitPlansMember_F2FEC5D90C71D665BC2718C69849ED0E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DomesticDefinedBenefitPlansMember" xlink:label="loc_ifrs-full_DomesticDefinedBenefitPlansMember_3D373BF614AD4C5CF91918C69849E5CD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DefinedBenefitPlansMember_F2FEC5D90C71D665BC2718C69849ED0E" xlink:to="loc_ifrs-full_DomesticDefinedBenefitPlansMember_3D373BF614AD4C5CF91918C69849E5CD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ForeignDefinedBenefitPlansMember" xlink:label="loc_ifrs-full_ForeignDefinedBenefitPlansMember_802124FB40FB8D46E97B18C6984A6C9C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DefinedBenefitPlansMember_F2FEC5D90C71D665BC2718C69849ED0E" xlink:to="loc_ifrs-full_ForeignDefinedBenefitPlansMember_802124FB40FB8D46E97B18C6984A6C9C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NetDefinedBenefitLiabilityAssetAxis" xlink:label="loc_ifrs-full_NetDefinedBenefitLiabilityAssetAxis_A52838B3FAD9B97A7C4E18C6984AE6CD" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetTable_D97A2047DFE7BE31822118C69847EDBF" xlink:to="loc_ifrs-full_NetDefinedBenefitLiabilityAssetAxis_A52838B3FAD9B97A7C4E18C6984AE6CD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NetDefinedBenefitLiabilityAssetMember" xlink:label="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_C740194E92C9087FD49C18C6984BB66D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_NetDefinedBenefitLiabilityAssetAxis_A52838B3FAD9B97A7C4E18C6984AE6CD" xlink:to="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_C740194E92C9087FD49C18C6984BB66D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NetDefinedBenefitLiabilityAssetMember" xlink:label="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_C740194E92C9087FD49C18C6984BB66D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_NetDefinedBenefitLiabilityAssetAxis_A52838B3FAD9B97A7C4E18C6984AE6CD" xlink:to="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_C740194E92C9087FD49C18C6984BB66D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PresentValueOfDefinedBenefitObligationMember" xlink:label="loc_ifrs-full_PresentValueOfDefinedBenefitObligationMember_B4E066C45C073F401FDE18C6984B5DA4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NetDefinedBenefitLiabilityAssetMember_C740194E92C9087FD49C18C6984BB66D" xlink:to="loc_ifrs-full_PresentValueOfDefinedBenefitObligationMember_B4E066C45C073F401FDE18C6984B5DA4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CurrentServiceCostNetDefinedBenefitLiabilityAsset" xlink:label="loc_ifrs-full_CurrentServiceCostNetDefinedBenefitLiabilityAsset_90A18CC80B354AB6076118C6984B6B42" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_C0E5D7F403342C5FF5D818C6984B4A25" xlink:to="loc_ifrs-full_CurrentServiceCostNetDefinedBenefitLiabilityAsset_90A18CC80B354AB6076118C6984B6B42" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InterestExpenseIncomeNetDefinedBenefitLiabilityAsset" xlink:label="loc_ifrs-full_InterestExpenseIncomeNetDefinedBenefitLiabilityAsset_3E999840129096D49F7718C6984C9F7A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_C0E5D7F403342C5FF5D818C6984B4A25" xlink:to="loc_ifrs-full_InterestExpenseIncomeNetDefinedBenefitLiabilityAsset_3E999840129096D49F7718C6984C9F7A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PastServiceCostNetDefinedBenefitLiabilityAsset" xlink:label="loc_ifrs-full_PastServiceCostNetDefinedBenefitLiabilityAsset_831280B7FDB8B132615A18C6984CE9DE" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_C0E5D7F403342C5FF5D818C6984B4A25" xlink:to="loc_ifrs-full_PastServiceCostNetDefinedBenefitLiabilityAsset_831280B7FDB8B132615A18C6984CE9DE" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_Administrativecostsnetdefinedbenefitliabilityasset" xlink:label="loc_cae_Administrativecostsnetdefinedbenefitliabilityasset_2BC4F655D24316243B7418C6984CDFD4" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_C0E5D7F403342C5FF5D818C6984B4A25" xlink:to="loc_cae_Administrativecostsnetdefinedbenefitliabilityasset_2BC4F655D24316243B7418C6984CDFD4" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PostemploymentBenefitCostDefinedBenefitPlans" xlink:label="loc_cae_PostemploymentBenefitCostDefinedBenefitPlans_08EE222295BA6C3F76161966DF024D8F" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNetDefinedBenefitLiabilityAssetLineItems_C0E5D7F403342C5FF5D818C6984B4A25" xlink:to="loc_cae_PostemploymentBenefitCostDefinedBenefitPlans_08EE222295BA6C3F76161966DF024D8F" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/EmployeeBenefitsObligationsPlanAssetsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfFairValueOfPlanAssetsLineItems" xlink:label="loc_ifrs-full_DisclosureOfFairValueOfPlanAssetsLineItems_60E3C5A667F329A08942FF7C224C757F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfFairValueOfPlanAssetsTable" xlink:label="loc_ifrs-full_DisclosureOfFairValueOfPlanAssetsTable_85EE495BDB7ED7E100C5FF7C2247D76B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFairValueOfPlanAssetsLineItems_60E3C5A667F329A08942FF7C224C757F" xlink:to="loc_ifrs-full_DisclosureOfFairValueOfPlanAssetsTable_85EE495BDB7ED7E100C5FF7C2247D76B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_208C22148B81979E8098FF7C22476BC0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFairValueOfPlanAssetsTable_85EE495BDB7ED7E100C5FF7C2247D76B" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_208C22148B81979E8098FF7C22476BC0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AllLevelsOfFairValueHierarchyMember" xlink:label="loc_ifrs-full_AllLevelsOfFairValueHierarchyMember_D56A3F89C6E4384AD68BFF7C2247A485_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_208C22148B81979E8098FF7C22476BC0" xlink:to="loc_ifrs-full_AllLevelsOfFairValueHierarchyMember_D56A3F89C6E4384AD68BFF7C2247A485_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AllLevelsOfFairValueHierarchyMember" xlink:label="loc_ifrs-full_AllLevelsOfFairValueHierarchyMember_D56A3F89C6E4384AD68BFF7C2247A485" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_208C22148B81979E8098FF7C22476BC0" xlink:to="loc_ifrs-full_AllLevelsOfFairValueHierarchyMember_D56A3F89C6E4384AD68BFF7C2247A485" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Level1OfFairValueHierarchyMember" xlink:label="loc_ifrs-full_Level1OfFairValueHierarchyMember_40F0F20B9469C67B1438FF7C22483093" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AllLevelsOfFairValueHierarchyMember_D56A3F89C6E4384AD68BFF7C2247A485" xlink:to="loc_ifrs-full_Level1OfFairValueHierarchyMember_40F0F20B9469C67B1438FF7C22483093" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Level2And3OfFairValueHierarchyMember" xlink:label="loc_ifrs-full_Level2And3OfFairValueHierarchyMember_68E4971725ED04C85F97FF7C2248E74E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AllLevelsOfFairValueHierarchyMember_D56A3F89C6E4384AD68BFF7C2247A485" xlink:to="loc_ifrs-full_Level2And3OfFairValueHierarchyMember_68E4971725ED04C85F97FF7C2248E74E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TypeofDebtInstrumentAxis" xlink:label="loc_cae_TypeofDebtInstrumentAxis_B85D5D015C278273E5A5FF7C22482932" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFairValueOfPlanAssetsTable_85EE495BDB7ED7E100C5FF7C2247D76B" xlink:to="loc_cae_TypeofDebtInstrumentAxis_B85D5D015C278273E5A5FF7C22482932" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TypeofDebtInstrumentDomain" xlink:label="loc_cae_TypeofDebtInstrumentDomain_3397780F4E43E97CD358FF7C22496342_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_TypeofDebtInstrumentAxis_B85D5D015C278273E5A5FF7C22482932" xlink:to="loc_cae_TypeofDebtInstrumentDomain_3397780F4E43E97CD358FF7C22496342_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TypeofDebtInstrumentDomain" xlink:label="loc_cae_TypeofDebtInstrumentDomain_3397780F4E43E97CD358FF7C22496342" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_TypeofDebtInstrumentAxis_B85D5D015C278273E5A5FF7C22482932" xlink:to="loc_cae_TypeofDebtInstrumentDomain_3397780F4E43E97CD358FF7C22496342" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_MunicipalDebtMember" xlink:label="loc_cae_MunicipalDebtMember_D7D64DA3F59E67089FB4FF7C224951FE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_TypeofDebtInstrumentDomain_3397780F4E43E97CD358FF7C22496342" xlink:to="loc_cae_MunicipalDebtMember_D7D64DA3F59E67089FB4FF7C224951FE" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CorporateDebtMember" xlink:label="loc_cae_CorporateDebtMember_A63AE6AAA38D46DD249BFF7C2249CED2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_TypeofDebtInstrumentDomain_3397780F4E43E97CD358FF7C22496342" xlink:to="loc_cae_CorporateDebtMember_A63AE6AAA38D46DD249BFF7C2249CED2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_OtherDebtMember" xlink:label="loc_cae_OtherDebtMember_75C0F271A2CC550F7E0AFF7C2249D911" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_TypeofDebtInstrumentDomain_3397780F4E43E97CD358FF7C22496342" xlink:to="loc_cae_OtherDebtMember_75C0F271A2CC550F7E0AFF7C2249D911" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GeographicalAreasAxis" xlink:label="loc_ifrs-full_GeographicalAreasAxis_2AB69B08F4609B5B8917FF7C224A2021" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFairValueOfPlanAssetsTable_85EE495BDB7ED7E100C5FF7C2247D76B" xlink:to="loc_ifrs-full_GeographicalAreasAxis_2AB69B08F4609B5B8917FF7C224A2021" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GeographicalAreasMember" xlink:label="loc_ifrs-full_GeographicalAreasMember_1FDAE2AAC9A3A71BF041FF7C224AE86F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_GeographicalAreasAxis_2AB69B08F4609B5B8917FF7C224A2021" xlink:to="loc_ifrs-full_GeographicalAreasMember_1FDAE2AAC9A3A71BF041FF7C224AE86F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GeographicalAreasMember" xlink:label="loc_ifrs-full_GeographicalAreasMember_1FDAE2AAC9A3A71BF041FF7C224AE86F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_GeographicalAreasAxis_2AB69B08F4609B5B8917FF7C224A2021" xlink:to="loc_ifrs-full_GeographicalAreasMember_1FDAE2AAC9A3A71BF041FF7C224AE86F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CountryOfDomicileMember" xlink:label="loc_ifrs-full_CountryOfDomicileMember_26770E92F97E60984021FF7C224A55B9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_1FDAE2AAC9A3A71BF041FF7C224AE86F" xlink:to="loc_ifrs-full_CountryOfDomicileMember_26770E92F97E60984021FF7C224A55B9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ForeignCountriesMember" xlink:label="loc_ifrs-full_ForeignCountriesMember_E2068B87DCDAEE312183FF7C224AC58A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_1FDAE2AAC9A3A71BF041FF7C224AE86F" xlink:to="loc_ifrs-full_ForeignCountriesMember_E2068B87DCDAEE312183FF7C224AC58A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DefinedBenefitPlansAxis" xlink:label="loc_ifrs-full_DefinedBenefitPlansAxis_7D7869C36A63C41B24A3FF7C224B55B4" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFairValueOfPlanAssetsTable_85EE495BDB7ED7E100C5FF7C2247D76B" xlink:to="loc_ifrs-full_DefinedBenefitPlansAxis_7D7869C36A63C41B24A3FF7C224B55B4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DefinedBenefitPlansMember" xlink:label="loc_ifrs-full_DefinedBenefitPlansMember_7A412E8E205C036ED87CFF7C224BE65D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_DefinedBenefitPlansAxis_7D7869C36A63C41B24A3FF7C224B55B4" xlink:to="loc_ifrs-full_DefinedBenefitPlansMember_7A412E8E205C036ED87CFF7C224BE65D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DefinedBenefitPlansMember" xlink:label="loc_ifrs-full_DefinedBenefitPlansMember_7A412E8E205C036ED87CFF7C224BE65D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_DefinedBenefitPlansAxis_7D7869C36A63C41B24A3FF7C224B55B4" xlink:to="loc_ifrs-full_DefinedBenefitPlansMember_7A412E8E205C036ED87CFF7C224BE65D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DomesticDefinedBenefitPlansMember" xlink:label="loc_ifrs-full_DomesticDefinedBenefitPlansMember_C1EA820235677A7F8F91FF7C224B5520" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DefinedBenefitPlansMember_7A412E8E205C036ED87CFF7C224BE65D" xlink:to="loc_ifrs-full_DomesticDefinedBenefitPlansMember_C1EA820235677A7F8F91FF7C224B5520" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ForeignDefinedBenefitPlansMember" xlink:label="loc_ifrs-full_ForeignDefinedBenefitPlansMember_D8D7552B2B6384C4B0CCFF7C224B4258" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DefinedBenefitPlansMember_7A412E8E205C036ED87CFF7C224BE65D" xlink:to="loc_ifrs-full_ForeignDefinedBenefitPlansMember_D8D7552B2B6384C4B0CCFF7C224B4258" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_InsuredAnnuitiesAmountContributedToFairValueOfPlanAssets" xlink:label="loc_cae_InsuredAnnuitiesAmountContributedToFairValueOfPlanAssets_EB6F9724E60EADB83562FF7C224CB371" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFairValueOfPlanAssetsLineItems_60E3C5A667F329A08942FF7C224C757F" xlink:to="loc_cae_InsuredAnnuitiesAmountContributedToFairValueOfPlanAssets_EB6F9724E60EADB83562FF7C224CB371" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EquityInstrumentsAmountContributedToFairValueOfPlanAssets" xlink:label="loc_ifrs-full_EquityInstrumentsAmountContributedToFairValueOfPlanAssets_309504F874AEAF947452FF7C224CEAB5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFairValueOfPlanAssetsLineItems_60E3C5A667F329A08942FF7C224C757F" xlink:to="loc_ifrs-full_EquityInstrumentsAmountContributedToFairValueOfPlanAssets_309504F874AEAF947452FF7C224CEAB5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DebtInstrumentsAmountContributedToFairValueOfPlanAssets" xlink:label="loc_ifrs-full_DebtInstrumentsAmountContributedToFairValueOfPlanAssets_9FF6762746F80191523FFF7C224CD7AE" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFairValueOfPlanAssetsLineItems_60E3C5A667F329A08942FF7C224C757F" xlink:to="loc_ifrs-full_DebtInstrumentsAmountContributedToFairValueOfPlanAssets_9FF6762746F80191523FFF7C224CD7AE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CashAndCashEquivalentsAmountContributedToFairValueOfPlanAssets" xlink:label="loc_ifrs-full_CashAndCashEquivalentsAmountContributedToFairValueOfPlanAssets_0C6AC523492BE472A346FF7C224D5D71" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFairValueOfPlanAssetsLineItems_60E3C5A667F329A08942FF7C224C757F" xlink:to="loc_ifrs-full_CashAndCashEquivalentsAmountContributedToFairValueOfPlanAssets_0C6AC523492BE472A346FF7C224D5D71" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherAssetsAmountContributedToFairValueOfPlanAssets" xlink:label="loc_ifrs-full_OtherAssetsAmountContributedToFairValueOfPlanAssets_49EA351344F036A2DBC2FF7C224D2B08" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFairValueOfPlanAssetsLineItems_60E3C5A667F329A08942FF7C224C757F" xlink:to="loc_ifrs-full_OtherAssetsAmountContributedToFairValueOfPlanAssets_49EA351344F036A2DBC2FF7C224D2B08" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PlanAssetsAtFairValue" xlink:label="loc_ifrs-full_PlanAssetsAtFairValue_04807AB73DA60DA739B8FF7C224D36EE" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFairValueOfPlanAssetsLineItems_60E3C5A667F329A08942FF7C224C757F" xlink:to="loc_ifrs-full_PlanAssetsAtFairValue_04807AB73DA60DA739B8FF7C224D36EE" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/EmployeeBenefitsObligationsSignificantAssumptionsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDefinedBenefitPlansLineItems" xlink:label="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_53168ABBBB710C19AD1722F3C77A442E" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfDefinedBenefitPlansTable" xlink:label="loc_ifrs-full_DisclosureOfDefinedBenefitPlansTable_0F97B6BB95D87C7A14D422F3C776F65B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_53168ABBBB710C19AD1722F3C77A442E" xlink:to="loc_ifrs-full_DisclosureOfDefinedBenefitPlansTable_0F97B6BB95D87C7A14D422F3C776F65B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ActuarialAssumptionsAxis" xlink:label="loc_ifrs-full_ActuarialAssumptionsAxis_949A65840364913BA69722F3C777EDDA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansTable_0F97B6BB95D87C7A14D422F3C776F65B" xlink:to="loc_ifrs-full_ActuarialAssumptionsAxis_949A65840364913BA69722F3C777EDDA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ActuarialAssumptionsMember" xlink:label="loc_ifrs-full_ActuarialAssumptionsMember_A95CCC194D0C8158F04922F3C7770A5B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ActuarialAssumptionsAxis_949A65840364913BA69722F3C777EDDA" xlink:to="loc_ifrs-full_ActuarialAssumptionsMember_A95CCC194D0C8158F04922F3C7770A5B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ActuarialAssumptionsMember" xlink:label="loc_ifrs-full_ActuarialAssumptionsMember_A95CCC194D0C8158F04922F3C7770A5B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ActuarialAssumptionsAxis_949A65840364913BA69722F3C777EDDA" xlink:to="loc_ifrs-full_ActuarialAssumptionsMember_A95CCC194D0C8158F04922F3C7770A5B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ActuarialAssumptionOfDiscountRatesMember" xlink:label="loc_ifrs-full_ActuarialAssumptionOfDiscountRatesMember_30EC1352822AE86EC9C722F3C7781CD0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ActuarialAssumptionsMember_A95CCC194D0C8158F04922F3C7770A5B" xlink:to="loc_ifrs-full_ActuarialAssumptionOfDiscountRatesMember_30EC1352822AE86EC9C722F3C7781CD0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ActuarialAssumptionOfExpectedRatesOfSalaryIncreasesMember" xlink:label="loc_ifrs-full_ActuarialAssumptionOfExpectedRatesOfSalaryIncreasesMember_5083140FF06B984C11ED22F3C7784438" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ActuarialAssumptionsMember_A95CCC194D0C8158F04922F3C7770A5B" xlink:to="loc_ifrs-full_ActuarialAssumptionOfExpectedRatesOfSalaryIncreasesMember_5083140FF06B984C11ED22F3C7784438" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FundingArrangementsOfDefinedBenefitPlansAxis" xlink:label="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_895D5B2C84DF45D6E53022F3C7780C3E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansTable_0F97B6BB95D87C7A14D422F3C776F65B" xlink:to="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_895D5B2C84DF45D6E53022F3C7780C3E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FundingArrangementsOfDefinedBenefitPlansDomain" xlink:label="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_AB2648DB3C30C5DA217822F3C7787204_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_895D5B2C84DF45D6E53022F3C7780C3E" xlink:to="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_AB2648DB3C30C5DA217822F3C7787204_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FundingArrangementsOfDefinedBenefitPlansDomain" xlink:label="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_AB2648DB3C30C5DA217822F3C7787204" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansAxis_895D5B2C84DF45D6E53022F3C7780C3E" xlink:to="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_AB2648DB3C30C5DA217822F3C7787204" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_WhollyOrPartlyFundedDefinedBenefitPlansMember" xlink:label="loc_cae_WhollyOrPartlyFundedDefinedBenefitPlansMember_34A3A5C1A4536D1D3F4522F3C77985AF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_AB2648DB3C30C5DA217822F3C7787204" xlink:to="loc_cae_WhollyOrPartlyFundedDefinedBenefitPlansMember_34A3A5C1A4536D1D3F4522F3C77985AF" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_WhollyUnfundedDefinedBenefitPlansMember" xlink:label="loc_cae_WhollyUnfundedDefinedBenefitPlansMember_C9466F6F6AB1029F5E0022F3C7792EFD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_FundingArrangementsOfDefinedBenefitPlansDomain_AB2648DB3C30C5DA217822F3C7787204" xlink:to="loc_cae_WhollyUnfundedDefinedBenefitPlansMember_C9466F6F6AB1029F5E0022F3C7792EFD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DefinedBenefitPlansAxis" xlink:label="loc_ifrs-full_DefinedBenefitPlansAxis_A07D51C9D7B73D00168322F3C779D3AC" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansTable_0F97B6BB95D87C7A14D422F3C776F65B" xlink:to="loc_ifrs-full_DefinedBenefitPlansAxis_A07D51C9D7B73D00168322F3C779D3AC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DefinedBenefitPlansMember" xlink:label="loc_ifrs-full_DefinedBenefitPlansMember_13BF2AF051315FB3B0F322F3C77952A9_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_DefinedBenefitPlansAxis_A07D51C9D7B73D00168322F3C779D3AC" xlink:to="loc_ifrs-full_DefinedBenefitPlansMember_13BF2AF051315FB3B0F322F3C77952A9_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DefinedBenefitPlansMember" xlink:label="loc_ifrs-full_DefinedBenefitPlansMember_13BF2AF051315FB3B0F322F3C77952A9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_DefinedBenefitPlansAxis_A07D51C9D7B73D00168322F3C779D3AC" xlink:to="loc_ifrs-full_DefinedBenefitPlansMember_13BF2AF051315FB3B0F322F3C77952A9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DomesticDefinedBenefitPlansMember" xlink:label="loc_ifrs-full_DomesticDefinedBenefitPlansMember_73928E10D214984EB19F22F3C77AE60A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DefinedBenefitPlansMember_13BF2AF051315FB3B0F322F3C77952A9" xlink:to="loc_ifrs-full_DomesticDefinedBenefitPlansMember_73928E10D214984EB19F22F3C77AE60A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ForeignDefinedBenefitPlansMember" xlink:label="loc_ifrs-full_ForeignDefinedBenefitPlansMember_89A6A65E295E82A4E36422F3C77AC7DF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DefinedBenefitPlansMember_13BF2AF051315FB3B0F322F3C77952A9" xlink:to="loc_ifrs-full_ForeignDefinedBenefitPlansMember_89A6A65E295E82A4E36422F3C77AC7DF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumption" xlink:label="loc_ifrs-full_IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumption_ACD7943FE72208BBEFBD22F3C77A0254" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_53168ABBBB710C19AD1722F3C77A442E" xlink:to="loc_ifrs-full_IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumption_ACD7943FE72208BBEFBD22F3C77A0254" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumption" xlink:label="loc_ifrs-full_IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumption_F63E57DFFAE06EF2B85422F3C77BCB59" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDefinedBenefitPlansLineItems_53168ABBBB710C19AD1722F3C77A442E" xlink:to="loc_ifrs-full_IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumption_F63E57DFFAE06EF2B85422F3C77BCB59" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/EmployeeBenefitsObligationsSignificantAssumptionsWeightedDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems" xlink:label="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems_B22A69412351BC5F745A22F3C7943268" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable" xlink:label="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable_69925CDF5CEDF24A069A22F3C7927E9A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems_B22A69412351BC5F745A22F3C7943268" xlink:to="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable_69925CDF5CEDF24A069A22F3C7927E9A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DefinedBenefitPlansAxis" xlink:label="loc_ifrs-full_DefinedBenefitPlansAxis_3AA18E539C37E1F7DEE722F3C79333A5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable_69925CDF5CEDF24A069A22F3C7927E9A" xlink:to="loc_ifrs-full_DefinedBenefitPlansAxis_3AA18E539C37E1F7DEE722F3C79333A5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DefinedBenefitPlansMember" xlink:label="loc_ifrs-full_DefinedBenefitPlansMember_500F2C0B19562597C10D22F3C7937DCE_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_DefinedBenefitPlansAxis_3AA18E539C37E1F7DEE722F3C79333A5" xlink:to="loc_ifrs-full_DefinedBenefitPlansMember_500F2C0B19562597C10D22F3C7937DCE_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DefinedBenefitPlansMember" xlink:label="loc_ifrs-full_DefinedBenefitPlansMember_500F2C0B19562597C10D22F3C7937DCE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_DefinedBenefitPlansAxis_3AA18E539C37E1F7DEE722F3C79333A5" xlink:to="loc_ifrs-full_DefinedBenefitPlansMember_500F2C0B19562597C10D22F3C7937DCE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DomesticDefinedBenefitPlansMember" xlink:label="loc_ifrs-full_DomesticDefinedBenefitPlansMember_B77BBF4C641EF64D09E922F3C7931C71" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DefinedBenefitPlansMember_500F2C0B19562597C10D22F3C7937DCE" xlink:to="loc_ifrs-full_DomesticDefinedBenefitPlansMember_B77BBF4C641EF64D09E922F3C7931C71" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ForeignDefinedBenefitPlansMember" xlink:label="loc_ifrs-full_ForeignDefinedBenefitPlansMember_4451C8B05E42BB5D89C022F3C794B922" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DefinedBenefitPlansMember_500F2C0B19562597C10D22F3C7937DCE" xlink:to="loc_ifrs-full_ForeignDefinedBenefitPlansMember_4451C8B05E42BB5D89C022F3C794B922" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ActuarialAssumptionOfDiscountRates" xlink:label="loc_ifrs-full_ActuarialAssumptionOfDiscountRates_49FC1DB921A5FB916FE522F3C79431B2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems_B22A69412351BC5F745A22F3C7943268" xlink:to="loc_ifrs-full_ActuarialAssumptionOfDiscountRates_49FC1DB921A5FB916FE522F3C79431B2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ActuarialAssumptionOfExpectedRatesOfSalaryIncreases" xlink:label="loc_ifrs-full_ActuarialAssumptionOfExpectedRatesOfSalaryIncreases_2B733CD1639549D7C4FE22F3C7944867" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems_B22A69412351BC5F745A22F3C7943268" xlink:to="loc_ifrs-full_ActuarialAssumptionOfExpectedRatesOfSalaryIncreases_2B733CD1639549D7C4FE22F3C7944867" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ActuarialAssumptionOfDiscountRatesNetPensionCost" xlink:label="loc_cae_ActuarialAssumptionOfDiscountRatesNetPensionCost_118758AA31136AD1CC0722F3C794E754" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems_B22A69412351BC5F745A22F3C7943268" xlink:to="loc_cae_ActuarialAssumptionOfDiscountRatesNetPensionCost_118758AA31136AD1CC0722F3C794E754" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ActuarialAssumptionOfExpectedRatesOfSalaryIncreasesNetPensionCost" xlink:label="loc_cae_ActuarialAssumptionOfExpectedRatesOfSalaryIncreasesNetPensionCost_26C426A8AEEA3F7B2AFA22F3C7952167" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems_B22A69412351BC5F745A22F3C7943268" xlink:to="loc_cae_ActuarialAssumptionOfExpectedRatesOfSalaryIncreasesNetPensionCost_26C426A8AEEA3F7B2AFA22F3C7952167" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/EmployeeBenefitsObligationsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/EmployeeCompensation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/EmployeeCompensationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/EmployeeCompensationTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/FairValueOfFinancialInstruments" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/FairValueOfFinancialInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems" xlink:label="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems_511894427011530BBB72FF7C20A824C8" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable" xlink:label="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable_7EF985F528E254B3C730FF7C209E28A9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems_511894427011530BBB72FF7C20A824C8" xlink:to="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable_7EF985F528E254B3C730FF7C209E28A9" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="cae-20180331.xsd#cae_IncomeStatementLocation1Axis" xlink:label="loc_cae_IncomeStatementLocation1Axis_2AC1C60853F15DA92FFCFF7C209F847A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable_7EF985F528E254B3C730FF7C209E28A9" xlink:to="loc_cae_IncomeStatementLocation1Axis_2AC1C60853F15DA92FFCFF7C209F847A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_IncomeStatementLocation1Domain" xlink:label="loc_cae_IncomeStatementLocation1Domain_16BF6A3423D714BCA304FF7C209FEB8E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_IncomeStatementLocation1Axis_2AC1C60853F15DA92FFCFF7C209F847A" xlink:to="loc_cae_IncomeStatementLocation1Domain_16BF6A3423D714BCA304FF7C209FEB8E_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_IncomeStatementLocation1Domain" xlink:label="loc_cae_IncomeStatementLocation1Domain_16BF6A3423D714BCA304FF7C209FEB8E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_IncomeStatementLocation1Axis_2AC1C60853F15DA92FFCFF7C209F847A" xlink:to="loc_cae_IncomeStatementLocation1Domain_16BF6A3423D714BCA304FF7C209FEB8E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ProfitLossMember" xlink:label="loc_cae_ProfitLossMember_6E7F923ADDDD444E6E83FF7C209FA0D9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_IncomeStatementLocation1Domain_16BF6A3423D714BCA304FF7C209FEB8E" xlink:to="loc_cae_ProfitLossMember_6E7F923ADDDD444E6E83FF7C209FA0D9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_ifrs-full_AccumulatedOtherComprehensiveIncomeMember_46E5420F3F18160F1DF0FFAE1A7B026C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_IncomeStatementLocation1Domain_16BF6A3423D714BCA304FF7C209FEB8E" xlink:to="loc_ifrs-full_AccumulatedOtherComprehensiveIncomeMember_46E5420F3F18160F1DF0FFAE1A7B026C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CategoriesOfFinancialAssetsAxis" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_6CCBCC50F190B8CB4945FF7C20A05A35" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable_7EF985F528E254B3C730FF7C209E28A9" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_6CCBCC50F190B8CB4945FF7C20A05A35" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialAssetsCategoryMember" xlink:label="loc_ifrs-full_FinancialAssetsCategoryMember_E993416DBCC2AB2F5C7DFF7C20A0492F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_6CCBCC50F190B8CB4945FF7C20A05A35" xlink:to="loc_ifrs-full_FinancialAssetsCategoryMember_E993416DBCC2AB2F5C7DFF7C20A0492F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialAssetsCategoryMember" xlink:label="loc_ifrs-full_FinancialAssetsCategoryMember_E993416DBCC2AB2F5C7DFF7C20A0492F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_6CCBCC50F190B8CB4945FF7C20A05A35" xlink:to="loc_ifrs-full_FinancialAssetsCategoryMember_E993416DBCC2AB2F5C7DFF7C20A0492F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember_13B26412536822480163FF7C20A1E4E9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_FinancialAssetsCategoryMember_E993416DBCC2AB2F5C7DFF7C20A0492F" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember_13B26412536822480163FF7C20A1E4E9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember_F0A0BCB2E3F3F10A3A45FF7C20A120C0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_FinancialAssetsCategoryMember_E993416DBCC2AB2F5C7DFF7C20A0492F" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember_F0A0BCB2E3F3F10A3A45FF7C20A120C0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LoansAndReceivablesCategoryMember" xlink:label="loc_ifrs-full_LoansAndReceivablesCategoryMember_B1C8B2C867EC507ED470FF7C20A195B0" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_FinancialAssetsCategoryMember_E993416DBCC2AB2F5C7DFF7C20A0492F" xlink:to="loc_ifrs-full_LoansAndReceivablesCategoryMember_B1C8B2C867EC507ED470FF7C20A195B0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialAssetsAvailableforsaleCategoryMember" xlink:label="loc_ifrs-full_FinancialAssetsAvailableforsaleCategoryMember_D891D26FA492D06923BFFF7C20A1374F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_FinancialAssetsCategoryMember_E993416DBCC2AB2F5C7DFF7C20A0492F" xlink:to="loc_ifrs-full_FinancialAssetsAvailableforsaleCategoryMember_D891D26FA492D06923BFFF7C20A1374F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesAxis" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_B2B8EDA3BCCF2A168DCCFF7C20A18DF9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable_7EF985F528E254B3C730FF7C209E28A9" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_B2B8EDA3BCCF2A168DCCFF7C20A18DF9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialLiabilitiesCategoryMember" xlink:label="loc_ifrs-full_FinancialLiabilitiesCategoryMember_1478B75017950EEE0B03FF7C20A22006_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_B2B8EDA3BCCF2A168DCCFF7C20A18DF9" xlink:to="loc_ifrs-full_FinancialLiabilitiesCategoryMember_1478B75017950EEE0B03FF7C20A22006_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialLiabilitiesCategoryMember" xlink:label="loc_ifrs-full_FinancialLiabilitiesCategoryMember_1478B75017950EEE0B03FF7C20A22006" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_B2B8EDA3BCCF2A168DCCFF7C20A18DF9" xlink:to="loc_ifrs-full_FinancialLiabilitiesCategoryMember_1478B75017950EEE0B03FF7C20A22006" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember_F2DD9AF847F3EB671EC8FF7C20A253E4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_FinancialLiabilitiesCategoryMember_1478B75017950EEE0B03FF7C20A22006" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember_F2DD9AF847F3EB671EC8FF7C20A253E4" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FinancialliabilityatfairvaluethroughothercomprehensiveincomecategoryMember" xlink:label="loc_cae_FinancialliabilityatfairvaluethroughothercomprehensiveincomecategoryMember_4FB0A75748BC6CC66ED0FF7C20A2BC4B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_FinancialLiabilitiesCategoryMember_1478B75017950EEE0B03FF7C20A22006" xlink:to="loc_cae_FinancialliabilityatfairvaluethroughothercomprehensiveincomecategoryMember_4FB0A75748BC6CC66ED0FF7C20A2BC4B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember_5C17EFEF455EAF20E25FFF7C20A21B12" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_FinancialLiabilitiesCategoryMember_1478B75017950EEE0B03FF7C20A22006" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember_5C17EFEF455EAF20E25FFF7C20A21B12" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfLiabilitiesAxis" xlink:label="loc_ifrs-full_ClassesOfLiabilitiesAxis_F655AAA1D496BC4EA999FF7C20A377AF" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable_7EF985F528E254B3C730FF7C209E28A9" xlink:to="loc_ifrs-full_ClassesOfLiabilitiesAxis_F655AAA1D496BC4EA999FF7C20A377AF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LiabilitiesMember" xlink:label="loc_ifrs-full_LiabilitiesMember_71C7FEDA4B8926193992FF7C20A39BD6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesAxis_F655AAA1D496BC4EA999FF7C20A377AF" xlink:to="loc_ifrs-full_LiabilitiesMember_71C7FEDA4B8926193992FF7C20A39BD6_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LiabilitiesMember" xlink:label="loc_ifrs-full_LiabilitiesMember_71C7FEDA4B8926193992FF7C20A39BD6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesAxis_F655AAA1D496BC4EA999FF7C20A377AF" xlink:to="loc_ifrs-full_LiabilitiesMember_71C7FEDA4B8926193992FF7C20A39BD6" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ForwardForeignCurrencyContractsMember" xlink:label="loc_cae_ForwardForeignCurrencyContractsMember_6D6F7FFB400D3C72662DFF7C20A30027" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LiabilitiesMember_71C7FEDA4B8926193992FF7C20A39BD6" xlink:to="loc_cae_ForwardForeignCurrencyContractsMember_6D6F7FFB400D3C72662DFF7C20A30027" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ContingentConsiderationArisingOnBusinessCombinationsMember" xlink:label="loc_cae_ContingentConsiderationArisingOnBusinessCombinationsMember_6262E6116EB3A95FFA62FF7C20A347E2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LiabilitiesMember_71C7FEDA4B8926193992FF7C20A39BD6" xlink:to="loc_cae_ContingentConsiderationArisingOnBusinessCombinationsMember_6262E6116EB3A95FFA62FF7C20A347E2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_InterestRateSwapAgreementsMember" xlink:label="loc_cae_InterestRateSwapAgreementsMember_D7D404723BEC9E59914FFF7C20A49858" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LiabilitiesMember_71C7FEDA4B8926193992FF7C20A39BD6" xlink:to="loc_cae_InterestRateSwapAgreementsMember_D7D404723BEC9E59914FFF7C20A49858" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AccountsPayableandAccruedLiabilitiesMember" xlink:label="loc_cae_AccountsPayableandAccruedLiabilitiesMember_ED664E7AEDACBF73649BFF7C20A478BC" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LiabilitiesMember_71C7FEDA4B8926193992FF7C20A39BD6" xlink:to="loc_cae_AccountsPayableandAccruedLiabilitiesMember_ED664E7AEDACBF73649BFF7C20A478BC" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LongTermDebt1Member" xlink:label="loc_cae_LongTermDebt1Member_505EA6DD8541AB4ED71DFF7C20A4FBAB" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LiabilitiesMember_71C7FEDA4B8926193992FF7C20A39BD6" xlink:to="loc_cae_LongTermDebt1Member_505EA6DD8541AB4ED71DFF7C20A4FBAB" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_OtherNonCurrentLiabilitiesMember" xlink:label="loc_cae_OtherNonCurrentLiabilitiesMember_97DBD3FA66DFD7AD6B6BFF7C20A4B865" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LiabilitiesMember_71C7FEDA4B8926193992FF7C20A39BD6" xlink:to="loc_cae_OtherNonCurrentLiabilitiesMember_97DBD3FA66DFD7AD6B6BFF7C20A4B865" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfAssetsAxis" xlink:label="loc_ifrs-full_ClassesOfAssetsAxis_B48338E3AF30524E5EA2FF7C20A4D0C2" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable_7EF985F528E254B3C730FF7C209E28A9" xlink:to="loc_ifrs-full_ClassesOfAssetsAxis_B48338E3AF30524E5EA2FF7C20A4D0C2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfAssetsMember" xlink:label="loc_ifrs-full_ClassesOfAssetsMember_16E834B00E7DA80F0112FF7C20A4F015_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfAssetsAxis_B48338E3AF30524E5EA2FF7C20A4D0C2" xlink:to="loc_ifrs-full_ClassesOfAssetsMember_16E834B00E7DA80F0112FF7C20A4F015_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfAssetsMember" xlink:label="loc_ifrs-full_ClassesOfAssetsMember_16E834B00E7DA80F0112FF7C20A4F015" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfAssetsAxis_B48338E3AF30524E5EA2FF7C20A4D0C2" xlink:to="loc_ifrs-full_ClassesOfAssetsMember_16E834B00E7DA80F0112FF7C20A4F015" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CashAndCashEquivalents1Member" xlink:label="loc_cae_CashAndCashEquivalents1Member_E074D0A5BEC1E7E3C69EFF7C20A54621" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsMember_16E834B00E7DA80F0112FF7C20A4F015" xlink:to="loc_cae_CashAndCashEquivalents1Member_E074D0A5BEC1E7E3C69EFF7C20A54621" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_RestrictedCashMember" xlink:label="loc_cae_RestrictedCashMember_14905C662AADBB83B561FF7C20A5CF76" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsMember_16E834B00E7DA80F0112FF7C20A4F015" xlink:to="loc_cae_RestrictedCashMember_14905C662AADBB83B561FF7C20A5CF76" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EmbeddedForeignCurrencyDerivativesMember" xlink:label="loc_cae_EmbeddedForeignCurrencyDerivativesMember_B39B76D774667143BDB5FF7C20A5B8C9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsMember_16E834B00E7DA80F0112FF7C20A4F015" xlink:to="loc_cae_EmbeddedForeignCurrencyDerivativesMember_B39B76D774667143BDB5FF7C20A5B8C9" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EquitySwapAgreementsMember" xlink:label="loc_cae_EquitySwapAgreementsMember_4F2BB030DBB8CE0FA695FF7C20A5FC51" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsMember_16E834B00E7DA80F0112FF7C20A4F015" xlink:to="loc_cae_EquitySwapAgreementsMember_4F2BB030DBB8CE0FA695FF7C20A5FC51" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ForwardForeignCurrencyContractsMember" xlink:label="loc_cae_ForwardForeignCurrencyContractsMember_CAAD700CCFC7A9E77C7AFF7C20A66E69" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsMember_16E834B00E7DA80F0112FF7C20A4F015" xlink:to="loc_cae_ForwardForeignCurrencyContractsMember_CAAD700CCFC7A9E77C7AFF7C20A66E69" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ForeignCurrencySwapAgreementsMember" xlink:label="loc_cae_ForeignCurrencySwapAgreementsMember_D286943D0F85F3BAD705FF7C20A647D2" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsMember_16E834B00E7DA80F0112FF7C20A4F015" xlink:to="loc_cae_ForeignCurrencySwapAgreementsMember_D286943D0F85F3BAD705FF7C20A647D2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TradeReceivablesMember" xlink:label="loc_ifrs-full_TradeReceivablesMember_288DD1B0D66F4F55E5B5FF7C20A6243A" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsMember_16E834B00E7DA80F0112FF7C20A4F015" xlink:to="loc_ifrs-full_TradeReceivablesMember_288DD1B0D66F4F55E5B5FF7C20A6243A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AssetsContractsinProgressMember" xlink:label="loc_cae_AssetsContractsinProgressMember_E43339CB789DB7B547C6FF7C20A6826A" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsMember_16E834B00E7DA80F0112FF7C20A4F015" xlink:to="loc_cae_AssetsContractsinProgressMember_E43339CB789DB7B547C6FF7C20A6826A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_InvestmentInFinanceLeasesMember" xlink:label="loc_cae_InvestmentInFinanceLeasesMember_BFE45E6DF08A3238CF8DFF7C20A6C7D1" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsMember_16E834B00E7DA80F0112FF7C20A4F015" xlink:to="loc_cae_InvestmentInFinanceLeasesMember_BFE45E6DF08A3238CF8DFF7C20A6C7D1" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AdvancestoaPortfolioInvestmentMember" xlink:label="loc_cae_AdvancestoaPortfolioInvestmentMember_C8F56F6F2045AB522EBBFF7C20A713C9" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsMember_16E834B00E7DA80F0112FF7C20A4F015" xlink:to="loc_cae_AdvancestoaPortfolioInvestmentMember_C8F56F6F2045AB522EBBFF7C20A713C9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherAssetsMember" xlink:label="loc_ifrs-full_OtherAssetsMember_FC377FB89A67CE7402C8FF7C20A7E554" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsMember_16E834B00E7DA80F0112FF7C20A4F015" xlink:to="loc_ifrs-full_OtherAssetsMember_FC377FB89A67CE7402C8FF7C20A7E554" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LevelsOfFairValueHierarchyAxis" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_8CECC67B308D5476CE31FF7C20A7B95A" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable_7EF985F528E254B3C730FF7C209E28A9" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_8CECC67B308D5476CE31FF7C20A7B95A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AllLevelsOfFairValueHierarchyMember" xlink:label="loc_ifrs-full_AllLevelsOfFairValueHierarchyMember_4DBFB3F788FF2610C0D5FF7C20A76E4C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_8CECC67B308D5476CE31FF7C20A7B95A" xlink:to="loc_ifrs-full_AllLevelsOfFairValueHierarchyMember_4DBFB3F788FF2610C0D5FF7C20A76E4C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AllLevelsOfFairValueHierarchyMember" xlink:label="loc_ifrs-full_AllLevelsOfFairValueHierarchyMember_4DBFB3F788FF2610C0D5FF7C20A76E4C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_8CECC67B308D5476CE31FF7C20A7B95A" xlink:to="loc_ifrs-full_AllLevelsOfFairValueHierarchyMember_4DBFB3F788FF2610C0D5FF7C20A76E4C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Level1OfFairValueHierarchyMember" xlink:label="loc_ifrs-full_Level1OfFairValueHierarchyMember_2DB8A5F213BAD67819EFFF7C20A75E2E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AllLevelsOfFairValueHierarchyMember_4DBFB3F788FF2610C0D5FF7C20A76E4C" xlink:to="loc_ifrs-full_Level1OfFairValueHierarchyMember_2DB8A5F213BAD67819EFFF7C20A75E2E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Level2OfFairValueHierarchyMember" xlink:label="loc_ifrs-full_Level2OfFairValueHierarchyMember_166A7A0DA523087415E3FF7C20A8317E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AllLevelsOfFairValueHierarchyMember_4DBFB3F788FF2610C0D5FF7C20A76E4C" xlink:to="loc_ifrs-full_Level2OfFairValueHierarchyMember_166A7A0DA523087415E3FF7C20A8317E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Level3OfFairValueHierarchyMember" xlink:label="loc_ifrs-full_Level3OfFairValueHierarchyMember_80B63B5DFA97B8D797D9FF7C20A86479" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AllLevelsOfFairValueHierarchyMember_4DBFB3F788FF2610C0D5FF7C20A76E4C" xlink:to="loc_ifrs-full_Level3OfFairValueHierarchyMember_80B63B5DFA97B8D797D9FF7C20A86479" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialAssets" xlink:label="loc_ifrs-full_FinancialAssets_15F5D4E100E3C93354A3FF7C20A81ED5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems_511894427011530BBB72FF7C20A824C8" xlink:to="loc_ifrs-full_FinancialAssets_15F5D4E100E3C93354A3FF7C20A81ED5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialAssetsAtFairValue" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValue_E4FB906B95D7F6F38640FF7C20A82FF1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems_511894427011530BBB72FF7C20A824C8" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValue_E4FB906B95D7F6F38640FF7C20A82FF1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialLiabilities" xlink:label="loc_ifrs-full_FinancialLiabilities_CD433270281EDA28A801FF7C20A98A81" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems_511894427011530BBB72FF7C20A824C8" xlink:to="loc_ifrs-full_FinancialLiabilities_CD433270281EDA28A801FF7C20A98A81" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialLiabilitiesAtFairValue" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtFairValue_A8930A9A12A292A7D51AFF7C20A98379" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems_511894427011530BBB72FF7C20A824C8" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtFairValue_A8930A9A12A292A7D51AFF7C20A98379" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FinancialAssetsLiabilities" xlink:label="loc_cae_FinancialAssetsLiabilities_F33B2A78652209DD2DA1FF7C20A93368" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems_511894427011530BBB72FF7C20A824C8" xlink:to="loc_cae_FinancialAssetsLiabilities_F33B2A78652209DD2DA1FF7C20A93368" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FinancialAssetsLiabilitiesAtFairValue" xlink:label="loc_cae_FinancialAssetsLiabilitiesAtFairValue_9618C64432AA4B1C0388FF7C20A9C624" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems_511894427011530BBB72FF7C20A824C8" xlink:to="loc_cae_FinancialAssetsLiabilitiesAtFairValue_9618C64432AA4B1C0388FF7C20A9C624" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ChangesinLevel3FinancialInstrumentsRollForward" xlink:label="loc_cae_ChangesinLevel3FinancialInstrumentsRollForward_10768F053169F88944A0FF7C20A9C8F2" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems_511894427011530BBB72FF7C20A824C8" xlink:to="loc_cae_ChangesinLevel3FinancialInstrumentsRollForward_10768F053169F88944A0FF7C20A9C8F2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FinancialAssetsLiabilitiesRealizedandUnrealizedLossesGain" xlink:label="loc_cae_FinancialAssetsLiabilitiesRealizedandUnrealizedLossesGain_57C6708B9FEE155BD886FF7C20AA7F03" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_ChangesinLevel3FinancialInstrumentsRollForward_10768F053169F88944A0FF7C20A9C8F2" xlink:to="loc_cae_FinancialAssetsLiabilitiesRealizedandUnrealizedLossesGain_57C6708B9FEE155BD886FF7C20AA7F03" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FinancialAssetsLiabilitiesIssuedandSettled" xlink:label="loc_cae_FinancialAssetsLiabilitiesIssuedandSettled_E89833FD42F5D7FB9E9CFF7C20AA789B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_ChangesinLevel3FinancialInstrumentsRollForward_10768F053169F88944A0FF7C20A9C8F2" xlink:to="loc_cae_FinancialAssetsLiabilitiesIssuedandSettled_E89833FD42F5D7FB9E9CFF7C20AA789B" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/FairValueOfFinancialInstrumentsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/FinanceExpenseNet" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/FinanceExpenseNetDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/FinanceExpenseNetTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/FinancialRiskManagement" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/FinancialRiskManagementDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems" xlink:label="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskTable" xlink:label="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskTable_C13932BD509ADCDEB3261D7F76D04AE1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskTable_C13932BD509ADCDEB3261D7F76D04AE1" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfHedgesAxis" xlink:label="loc_ifrs-full_TypesOfHedgesAxis_CCB94A7806E56CA9322F1D7F76D09A2F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskTable_C13932BD509ADCDEB3261D7F76D04AE1" xlink:to="loc_ifrs-full_TypesOfHedgesAxis_CCB94A7806E56CA9322F1D7F76D09A2F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfHedgesMember" xlink:label="loc_ifrs-full_TypesOfHedgesMember_D35B5F2B336190F0B2FA1D7F76D173E8_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfHedgesAxis_CCB94A7806E56CA9322F1D7F76D09A2F" xlink:to="loc_ifrs-full_TypesOfHedgesMember_D35B5F2B336190F0B2FA1D7F76D173E8_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfHedgesMember" xlink:label="loc_ifrs-full_TypesOfHedgesMember_D35B5F2B336190F0B2FA1D7F76D173E8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfHedgesAxis_CCB94A7806E56CA9322F1D7F76D09A2F" xlink:to="loc_ifrs-full_TypesOfHedgesMember_D35B5F2B336190F0B2FA1D7F76D173E8" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_HedgesOfNetInvestmentInUSEntitiesMember" xlink:label="loc_cae_HedgesOfNetInvestmentInUSEntitiesMember_381A7F16AF81C4AFD4651D7F76D19C63" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfHedgesMember_D35B5F2B336190F0B2FA1D7F76D173E8" xlink:to="loc_cae_HedgesOfNetInvestmentInUSEntitiesMember_381A7F16AF81C4AFD4651D7F76D19C63" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TypeofDebtInstrumentAxis" xlink:label="loc_cae_TypeofDebtInstrumentAxis_28A759D264EB70C24A0C1D7F76D2D561" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskTable_C13932BD509ADCDEB3261D7F76D04AE1" xlink:to="loc_cae_TypeofDebtInstrumentAxis_28A759D264EB70C24A0C1D7F76D2D561" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TypeofDebtInstrumentDomain" xlink:label="loc_cae_TypeofDebtInstrumentDomain_5015E646D0DCBAD5814F1D7F76D2FCFF_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_TypeofDebtInstrumentAxis_28A759D264EB70C24A0C1D7F76D2D561" xlink:to="loc_cae_TypeofDebtInstrumentDomain_5015E646D0DCBAD5814F1D7F76D2FCFF_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TypeofDebtInstrumentDomain" xlink:label="loc_cae_TypeofDebtInstrumentDomain_5015E646D0DCBAD5814F1D7F76D2FCFF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_TypeofDebtInstrumentAxis_28A759D264EB70C24A0C1D7F76D2D561" xlink:to="loc_cae_TypeofDebtInstrumentDomain_5015E646D0DCBAD5814F1D7F76D2FCFF" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_MultiTranchePrivatePlacementDebtTrancheOneDecember2024Member" xlink:label="loc_cae_MultiTranchePrivatePlacementDebtTrancheOneDecember2024Member_85FFC4C9A5460588F1DC1D7F76D381E9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_TypeofDebtInstrumentDomain_5015E646D0DCBAD5814F1D7F76D2FCFF" xlink:to="loc_cae_MultiTranchePrivatePlacementDebtTrancheOneDecember2024Member_85FFC4C9A5460588F1DC1D7F76D381E9" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_MultiTranchePrivatePlacementDebtTrancheTwoDecember2027Member" xlink:label="loc_cae_MultiTranchePrivatePlacementDebtTrancheTwoDecember2027Member_EADA6CEB8D0C6218FB641D7F76D36A2D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_TypeofDebtInstrumentDomain_5015E646D0DCBAD5814F1D7F76D2FCFF" xlink:to="loc_cae_MultiTranchePrivatePlacementDebtTrancheTwoDecember2027Member_EADA6CEB8D0C6218FB641D7F76D36A2D" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CurrencyPairingAxis" xlink:label="loc_cae_CurrencyPairingAxis_8135F4874071D71F5E041D7F76D3CB8F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskTable_C13932BD509ADCDEB3261D7F76D04AE1" xlink:to="loc_cae_CurrencyPairingAxis_8135F4874071D71F5E041D7F76D3CB8F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CurrencyPairingDomain" xlink:label="loc_cae_CurrencyPairingDomain_9FC37D98C3D6FBC1A2A61D7F76D351E5_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_CurrencyPairingAxis_8135F4874071D71F5E041D7F76D3CB8F" xlink:to="loc_cae_CurrencyPairingDomain_9FC37D98C3D6FBC1A2A61D7F76D351E5_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CurrencyPairingDomain" xlink:label="loc_cae_CurrencyPairingDomain_9FC37D98C3D6FBC1A2A61D7F76D351E5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_CurrencyPairingAxis_8135F4874071D71F5E041D7F76D3CB8F" xlink:to="loc_cae_CurrencyPairingDomain_9FC37D98C3D6FBC1A2A61D7F76D351E5" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_USDGBPMember" xlink:label="loc_cae_USDGBPMember_4D1CFF50B9E7FDAE88371D7F76D48722" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_CurrencyPairingDomain_9FC37D98C3D6FBC1A2A61D7F76D351E5" xlink:to="loc_cae_USDGBPMember_4D1CFF50B9E7FDAE88371D7F76D48722" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_USDCDNMember" xlink:label="loc_cae_USDCDNMember_7222BF3D2BF6692679761D7F76D4867C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_CurrencyPairingDomain_9FC37D98C3D6FBC1A2A61D7F76D351E5" xlink:to="loc_cae_USDCDNMember_7222BF3D2BF6692679761D7F76D4867C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfRisksAxis" xlink:label="loc_ifrs-full_TypesOfRisksAxis_BCCAFAF387144580E0841D7F76D483CB" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskTable_C13932BD509ADCDEB3261D7F76D04AE1" xlink:to="loc_ifrs-full_TypesOfRisksAxis_BCCAFAF387144580E0841D7F76D483CB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfRisksMember" xlink:label="loc_ifrs-full_TypesOfRisksMember_9754BB12845BA0B1E8E41D7F76D54B8E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_BCCAFAF387144580E0841D7F76D483CB" xlink:to="loc_ifrs-full_TypesOfRisksMember_9754BB12845BA0B1E8E41D7F76D54B8E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfRisksMember" xlink:label="loc_ifrs-full_TypesOfRisksMember_9754BB12845BA0B1E8E41D7F76D54B8E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_BCCAFAF387144580E0841D7F76D483CB" xlink:to="loc_ifrs-full_TypesOfRisksMember_9754BB12845BA0B1E8E41D7F76D54B8E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CurrencyRiskMember" xlink:label="loc_ifrs-full_CurrencyRiskMember_3B98BF3DB51698A479BB1D7F76D55802" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksMember_9754BB12845BA0B1E8E41D7F76D54B8E" xlink:to="loc_ifrs-full_CurrencyRiskMember_3B98BF3DB51698A479BB1D7F76D55802" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InterestRateRiskMember" xlink:label="loc_ifrs-full_InterestRateRiskMember_59B21D1F34CDAE6F36921D7F76D51A84" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksMember_9754BB12845BA0B1E8E41D7F76D54B8E" xlink:to="loc_ifrs-full_InterestRateRiskMember_59B21D1F34CDAE6F36921D7F76D51A84" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfFinancialInstrumentsAxis" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_0364ABD6D53BEE71E7071D7F76D6A2F2" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskTable_C13932BD509ADCDEB3261D7F76D04AE1" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_0364ABD6D53BEE71E7071D7F76D6A2F2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfFinancialInstrumentsMember" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_BFB3544AA4ACA36941351D7F76D65529_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_0364ABD6D53BEE71E7071D7F76D6A2F2" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_BFB3544AA4ACA36941351D7F76D65529_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfFinancialInstrumentsMember" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_BFB3544AA4ACA36941351D7F76D65529" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_0364ABD6D53BEE71E7071D7F76D6A2F2" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_BFB3544AA4ACA36941351D7F76D65529" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ForeignCurrencySwapAgreementsMember" xlink:label="loc_cae_ForeignCurrencySwapAgreementsMember_DC6B7FB389F58C9087AC1D7F76D6A6F4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_BFB3544AA4ACA36941351D7F76D65529" xlink:to="loc_cae_ForeignCurrencySwapAgreementsMember_DC6B7FB389F58C9087AC1D7F76D6A6F4" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EquitySwapAgreementsMember" xlink:label="loc_cae_EquitySwapAgreementsMember_D6F2C0CEBED5B772ED901D7F76D78815" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_BFB3544AA4ACA36941351D7F76D65529" xlink:to="loc_cae_EquitySwapAgreementsMember_D6F2C0CEBED5B772ED901D7F76D78815" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MaturityAxis" xlink:label="loc_ifrs-full_MaturityAxis_CDCADEDC941A3DE9686A1D7F76D7E09F" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskTable_C13932BD509ADCDEB3261D7F76D04AE1" xlink:to="loc_ifrs-full_MaturityAxis_CDCADEDC941A3DE9686A1D7F76D7E09F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="loc_ifrs-full_AggregatedTimeBandsMember_D03CD70F93FBA181E3151D7F76D8AA4F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MaturityAxis_CDCADEDC941A3DE9686A1D7F76D7E09F" xlink:to="loc_ifrs-full_AggregatedTimeBandsMember_D03CD70F93FBA181E3151D7F76D8AA4F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="loc_ifrs-full_AggregatedTimeBandsMember_D03CD70F93FBA181E3151D7F76D8AA4F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MaturityAxis_CDCADEDC941A3DE9686A1D7F76D7E09F" xlink:to="loc_ifrs-full_AggregatedTimeBandsMember_D03CD70F93FBA181E3151D7F76D8AA4F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FiscalYear2020Member" xlink:label="loc_cae_FiscalYear2020Member_5047DE69A83236D0D98D1D7F76D86F63" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_D03CD70F93FBA181E3151D7F76D8AA4F" xlink:to="loc_cae_FiscalYear2020Member_5047DE69A83236D0D98D1D7F76D86F63" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FiscalYear2023Member" xlink:label="loc_cae_FiscalYear2023Member_1862CB8A3DA74970EBC21D7F76D8E5B0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_D03CD70F93FBA181E3151D7F76D8AA4F" xlink:to="loc_cae_FiscalYear2023Member_1862CB8A3DA74970EBC21D7F76D8E5B0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameAxis" xlink:label="loc_ifrs-full_BorrowingsByNameAxis_EA79A301193BF2926FAF1D7F76D981CE" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskTable_C13932BD509ADCDEB3261D7F76D04AE1" xlink:to="loc_ifrs-full_BorrowingsByNameAxis_EA79A301193BF2926FAF1D7F76D981CE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="loc_ifrs-full_BorrowingsByNameMember_007375170F04784DF2BE1D7F76D94ABC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_EA79A301193BF2926FAF1D7F76D981CE" xlink:to="loc_ifrs-full_BorrowingsByNameMember_007375170F04784DF2BE1D7F76D94ABC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BorrowingsByNameMember" xlink:label="loc_ifrs-full_BorrowingsByNameMember_007375170F04784DF2BE1D7F76D94ABC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_EA79A301193BF2926FAF1D7F76D981CE" xlink:to="loc_ifrs-full_BorrowingsByNameMember_007375170F04784DF2BE1D7F76D94ABC" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_RevolvingUnsecuredTermCreditFacilitySeptember2022Member" xlink:label="loc_cae_RevolvingUnsecuredTermCreditFacilitySeptember2022Member_68758BB35AE83BF0CC8F1D7F76D90FD0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_007375170F04784DF2BE1D7F76D94ABC" xlink:to="loc_cae_RevolvingUnsecuredTermCreditFacilitySeptember2022Member_68758BB35AE83BF0CC8F1D7F76D90FD0" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SeniorNotes1Member" xlink:label="loc_cae_SeniorNotes1Member_5EDBFA058BDBF4AC71641D7F76DAAAD0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameMember_007375170F04784DF2BE1D7F76D94ABC" xlink:to="loc_cae_SeniorNotes1Member_5EDBFA058BDBF4AC71641D7F76DAAAD0" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LineofCreditFacilityMaximumBorrowingCapacity1" xlink:label="loc_cae_LineofCreditFacilityMaximumBorrowingCapacity1_2357CB3EA5EFD8D7FD1F1D7F76DAFCCB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_cae_LineofCreditFacilityMaximumBorrowingCapacity1_2357CB3EA5EFD8D7FD1F1D7F76DAFCCB" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LineofCreditFacilityMaximumBorrowingCapacityOption" xlink:label="loc_cae_LineofCreditFacilityMaximumBorrowingCapacityOption_2BEC99193517387AA86C1D7F76DAF0B1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_cae_LineofCreditFacilityMaximumBorrowingCapacityOption_2BEC99193517387AA86C1D7F76DAF0B1" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AccountsReceivableMaximumAmountAvailabletoSell" xlink:label="loc_cae_AccountsReceivableMaximumAmountAvailabletoSell_98400E55D7CF520DF5F11D7F76DB4424" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_cae_AccountsReceivableMaximumAmountAvailabletoSell_98400E55D7CF520DF5F11D7F76DB4424" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AccountsReceivableAmountSoldToFinancialInstitution" xlink:label="loc_cae_AccountsReceivableAmountSoldToFinancialInstitution_12B579B64A47DE25E8BE1D7F76DB06F6" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_cae_AccountsReceivableAmountSoldToFinancialInstitution_12B579B64A47DE25E8BE1D7F76DB06F6" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AccountsReceivableAmountSoldToFinancialInstitutionFees" xlink:label="loc_cae_AccountsReceivableAmountSoldToFinancialInstitutionFees_34B52B50F4840EF910051D7F76DB3612" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_cae_AccountsReceivableAmountSoldToFinancialInstitutionFees_34B52B50F4840EF910051D7F76DB3612" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberofDerivativeAgreementsEnteredInTo" xlink:label="loc_cae_NumberofDerivativeAgreementsEnteredInTo_9496B1FCB8F3A174A2751D7F76DB5FFF" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_cae_NumberofDerivativeAgreementsEnteredInTo_9496B1FCB8F3A174A2751D7F76DB5FFF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd#invest_DerivativeNotionalAmount" xlink:label="loc_invest_DerivativeNotionalAmount_1A1FDC74841FE816E4F61D7F76DC0948" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_invest_DerivativeNotionalAmount_1A1FDC74841FE816E4F61D7F76DC0948" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberOfTranchesRelatingToTheMultitranchePrivatePlacementDebtOffering" xlink:label="loc_cae_NumberOfTranchesRelatingToTheMultitranchePrivatePlacementDebtOffering_ECCF14FCA0F50507D4F71D7F76DC599D" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_cae_NumberOfTranchesRelatingToTheMultitranchePrivatePlacementDebtOffering_ECCF14FCA0F50507D4F71D7F76DC599D" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SensitivityAnalysisToForeignCurrencyRateChange" xlink:label="loc_cae_SensitivityAnalysisToForeignCurrencyRateChange_389726E3B56D4F9E64D91D7F76DC5878" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_cae_SensitivityAnalysisToForeignCurrencyRateChange_389726E3B56D4F9E64D91D7F76DC5878" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_InterestRateSwapAgreementsNumberofFinancialInstitutions" xlink:label="loc_cae_InterestRateSwapAgreementsNumberofFinancialInstitutions_E4D30ABDE399422E3EC81D7F76DC52FE" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_cae_InterestRateSwapAgreementsNumberofFinancialInstitutions_E4D30ABDE399422E3EC81D7F76DC52FE" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PercentageOfDebtFixedInterestRate" xlink:label="loc_cae_PercentageOfDebtFixedInterestRate_6A7A63EA2F8DB7CCFFE91D7F76DDBB84" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_cae_PercentageOfDebtFixedInterestRate_6A7A63EA2F8DB7CCFFE91D7F76DDBB84" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SensitivityAnalysisToInterestRateChange" xlink:label="loc_cae_SensitivityAnalysisToInterestRateChange_D2CFDB894D3FA27BBDA01D7F76DDA307" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_cae_SensitivityAnalysisToInterestRateChange_D2CFDB894D3FA27BBDA01D7F76DDA307" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProfitLoss" xlink:label="loc_ifrs-full_ProfitLoss_7669868A11226B7B277D1D7F76DDE3AF" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_ifrs-full_ProfitLoss_7669868A11226B7B277D1D7F76DDE3AF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherComprehensiveIncome" xlink:label="loc_ifrs-full_OtherComprehensiveIncome_6984A20A181308A736701D7F76DEC731" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_ifrs-full_OtherComprehensiveIncome_6984A20A181308A736701D7F76DEC731" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EquitySwapAgreementCommonShares" xlink:label="loc_cae_EquitySwapAgreementCommonShares_82618EEF3098CCD51BE21D7F76DED4C8" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_cae_EquitySwapAgreementCommonShares_82618EEF3098CCD51BE21D7F76DED4C8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Borrowings" xlink:label="loc_ifrs-full_Borrowings_57F788D17272634126211D7F76DE5CFF" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_ifrs-full_Borrowings_57F788D17272634126211D7F76DE5CFF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GrossFinanceLeaseObligations" xlink:label="loc_ifrs-full_GrossFinanceLeaseObligations_29183A3B92E4E4F524DE1D7F76DE0771" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_ifrs-full_GrossFinanceLeaseObligations_29183A3B92E4E4F524DE1D7F76DE0771" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LettersOfCreditAndGuaranteesNet" xlink:label="loc_cae_LettersOfCreditAndGuaranteesNet_4E4B01F7FB601183E9241D7F76DE0607" xlink:type="locator" />
    <link:definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_cae_LettersOfCreditAndGuaranteesNet_4E4B01F7FB601183E9241D7F76DE0607" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SaleAndLeasebackTransactionsMaximumExposure" xlink:label="loc_cae_SaleAndLeasebackTransactionsMaximumExposure_45B14E95D13A5D1469AB1D7F76DF11B7" xlink:type="locator" />
    <link:definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_cae_SaleAndLeasebackTransactionsMaximumExposure_45B14E95D13A5D1469AB1D7F76DF11B7" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DeferredGainsArisingFromSaleAndLeasebackTransactions.UnderlyingEquipment" xlink:label="loc_cae_DeferredGainsArisingFromSaleAndLeasebackTransactions.UnderlyingEquipment_2BB7C7DBA691DB8C6CA41D7F76DF3CCC" xlink:type="locator" />
    <link:definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForFinancialAssetsHeldForManagingLiquidityRiskLineItems_686FE77B9F0BA1B982301D7F76DAE356" xlink:to="loc_cae_DeferredGainsArisingFromSaleAndLeasebackTransactions.UnderlyingEquipment_2BB7C7DBA691DB8C6CA41D7F76DF3CCC" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/FinancialRiskManagementForwardForeignCurrencyContractsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingLineItems" xlink:label="loc_ifrs-full_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingLineItems_7A4B9165A85CCA6D2DF722F3C5196D03" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingTable" xlink:label="loc_ifrs-full_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingTable_0C6CE4670C95EC2B49EE22F3C5123923" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingLineItems_7A4B9165A85CCA6D2DF722F3C5196D03" xlink:to="loc_ifrs-full_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingTable_0C6CE4670C95EC2B49EE22F3C5123923" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CurrencyPairingAxis" xlink:label="loc_cae_CurrencyPairingAxis_CAC8D35E5ADD25B79D7C22F3C512E324" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingTable_0C6CE4670C95EC2B49EE22F3C5123923" xlink:to="loc_cae_CurrencyPairingAxis_CAC8D35E5ADD25B79D7C22F3C512E324" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CurrencyPairingDomain" xlink:label="loc_cae_CurrencyPairingDomain_37B17EED16E84F75212222F3C51308B6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_CurrencyPairingAxis_CAC8D35E5ADD25B79D7C22F3C512E324" xlink:to="loc_cae_CurrencyPairingDomain_37B17EED16E84F75212222F3C51308B6_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CurrencyPairingDomain" xlink:label="loc_cae_CurrencyPairingDomain_37B17EED16E84F75212222F3C51308B6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_CurrencyPairingAxis_CAC8D35E5ADD25B79D7C22F3C512E324" xlink:to="loc_cae_CurrencyPairingDomain_37B17EED16E84F75212222F3C51308B6" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_USDCDNMember" xlink:label="loc_cae_USDCDNMember_8415623F6C0E79FCC51C22F3C51385B9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_CurrencyPairingDomain_37B17EED16E84F75212222F3C51308B6" xlink:to="loc_cae_USDCDNMember_8415623F6C0E79FCC51C22F3C51385B9" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CDNEURMember" xlink:label="loc_cae_CDNEURMember_6BD7E93FBF1E38AD3AA122F3C51479B2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_CurrencyPairingDomain_37B17EED16E84F75212222F3C51308B6" xlink:to="loc_cae_CDNEURMember_6BD7E93FBF1E38AD3AA122F3C51479B2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EURCDNMember" xlink:label="loc_cae_EURCDNMember_694E4C87D6296A8C153122F3C5143924" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_CurrencyPairingDomain_37B17EED16E84F75212222F3C51308B6" xlink:to="loc_cae_EURCDNMember_694E4C87D6296A8C153122F3C5143924" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_GBPCDNMember" xlink:label="loc_cae_GBPCDNMember_99BD4B710A4E9031659222F3C5154F1B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_CurrencyPairingDomain_37B17EED16E84F75212222F3C51308B6" xlink:to="loc_cae_GBPCDNMember_99BD4B710A4E9031659222F3C5154F1B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CDNGBPMember" xlink:label="loc_cae_CDNGBPMember_44BEFA03D3B9957617D422F3C515E5A8" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_CurrencyPairingDomain_37B17EED16E84F75212222F3C51308B6" xlink:to="loc_cae_CDNGBPMember_44BEFA03D3B9957617D422F3C515E5A8" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CDNUSDMember" xlink:label="loc_cae_CDNUSDMember_8D1CF3D366B3E7E9700F22F3C515C539" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_CurrencyPairingDomain_37B17EED16E84F75212222F3C51308B6" xlink:to="loc_cae_CDNUSDMember_8D1CF3D366B3E7E9700F22F3C515C539" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_GBPUSDMember" xlink:label="loc_cae_GBPUSDMember_08A2AF9422C6DC2B685C22F3C5161FEE" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_CurrencyPairingDomain_37B17EED16E84F75212222F3C51308B6" xlink:to="loc_cae_GBPUSDMember_08A2AF9422C6DC2B685C22F3C5161FEE" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_OtherCurrenciesMember" xlink:label="loc_cae_OtherCurrenciesMember_3D4A2D6C7FDCB6008D4222F3C51633BE" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_CurrencyPairingDomain_37B17EED16E84F75212222F3C51308B6" xlink:to="loc_cae_OtherCurrenciesMember_3D4A2D6C7FDCB6008D4222F3C51633BE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MaturityAxis" xlink:label="loc_ifrs-full_MaturityAxis_8E1BD2F40ABEF411C83122F3C516DDB0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingTable_0C6CE4670C95EC2B49EE22F3C5123923" xlink:to="loc_ifrs-full_MaturityAxis_8E1BD2F40ABEF411C83122F3C516DDB0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="loc_ifrs-full_AggregatedTimeBandsMember_4E6071DED477BC0E06CD22F3C5166DE0_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MaturityAxis_8E1BD2F40ABEF411C83122F3C516DDB0" xlink:to="loc_ifrs-full_AggregatedTimeBandsMember_4E6071DED477BC0E06CD22F3C5166DE0_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="loc_ifrs-full_AggregatedTimeBandsMember_4E6071DED477BC0E06CD22F3C5166DE0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MaturityAxis_8E1BD2F40ABEF411C83122F3C516DDB0" xlink:to="loc_ifrs-full_AggregatedTimeBandsMember_4E6071DED477BC0E06CD22F3C5166DE0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NotLaterThanOneYearMember" xlink:label="loc_ifrs-full_NotLaterThanOneYearMember_B0F4C1C17EF694614A4822F3C517FD22" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_4E6071DED477BC0E06CD22F3C5166DE0" xlink:to="loc_ifrs-full_NotLaterThanOneYearMember_B0F4C1C17EF694614A4822F3C517FD22" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember" xlink:label="loc_ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember_E96DD782DF58346FA58222F3C5179731" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_4E6071DED477BC0E06CD22F3C5166DE0" xlink:to="loc_ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember_E96DD782DF58346FA58222F3C5179731" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanThreeYearsAndNotLaterThanFiveYearsMember" xlink:label="loc_ifrs-full_LaterThanThreeYearsAndNotLaterThanFiveYearsMember_5EB16B0B078E6D25DF3122F3C517E8BB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_4E6071DED477BC0E06CD22F3C5166DE0" xlink:to="loc_ifrs-full_LaterThanThreeYearsAndNotLaterThanFiveYearsMember_5EB16B0B078E6D25DF3122F3C517E8BB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfRisksAxis" xlink:label="loc_ifrs-full_TypesOfRisksAxis_69E31CADA1A5B3C8FF4022F3C518953A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingTable_0C6CE4670C95EC2B49EE22F3C5123923" xlink:to="loc_ifrs-full_TypesOfRisksAxis_69E31CADA1A5B3C8FF4022F3C518953A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfRisksMember" xlink:label="loc_ifrs-full_TypesOfRisksMember_9E0251A53C085F5B531322F3C5188C5B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_69E31CADA1A5B3C8FF4022F3C518953A" xlink:to="loc_ifrs-full_TypesOfRisksMember_9E0251A53C085F5B531322F3C5188C5B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfRisksMember" xlink:label="loc_ifrs-full_TypesOfRisksMember_9E0251A53C085F5B531322F3C5188C5B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_69E31CADA1A5B3C8FF4022F3C518953A" xlink:to="loc_ifrs-full_TypesOfRisksMember_9E0251A53C085F5B531322F3C5188C5B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CurrencyRiskMember" xlink:label="loc_ifrs-full_CurrencyRiskMember_22B07E7390865CFF7F1B22F3C519107B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksMember_9E0251A53C085F5B531322F3C5188C5B" xlink:to="loc_ifrs-full_CurrencyRiskMember_22B07E7390865CFF7F1B22F3C519107B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RiskExposureAssociatedWithInstrumentsSharingCharacteristic" xlink:label="loc_ifrs-full_RiskExposureAssociatedWithInstrumentsSharingCharacteristic_BA3D5CEAAFDD240D6DE522F3C51A96A0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingLineItems_7A4B9165A85CCA6D2DF722F3C5196D03" xlink:to="loc_ifrs-full_RiskExposureAssociatedWithInstrumentsSharingCharacteristic_BA3D5CEAAFDD240D6DE522F3C51A96A0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AverageForeignExchangeRate" xlink:label="loc_ifrs-full_AverageForeignExchangeRate_EEC9B1269215A9ED9E4B22F3C51A9C26" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingLineItems_7A4B9165A85CCA6D2DF722F3C5196D03" xlink:to="loc_ifrs-full_AverageForeignExchangeRate_EEC9B1269215A9ED9E4B22F3C51A9C26" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/FinancialRiskManagementLettersOfCreditAndGuaranteesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/FinancialRiskManagementMaturityAnalysisDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesLineItems" xlink:label="loc_ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesLineItems_CFBF1E96A918268C8B0A22F3C53F743D" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesTable" xlink:label="loc_ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesTable_D82AB54B676E9DEB9F4922F3C5399E37" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesLineItems_CFBF1E96A918268C8B0A22F3C53F743D" xlink:to="loc_ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesTable_D82AB54B676E9DEB9F4922F3C5399E37" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfFinancialInstrumentsAxis" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_55C7F3DCF4C53E787D3722F3C53A960A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesTable_D82AB54B676E9DEB9F4922F3C5399E37" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_55C7F3DCF4C53E787D3722F3C53A960A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfFinancialInstrumentsMember" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_BC284CEFEEA908B04F0722F3C53ACBB1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_55C7F3DCF4C53E787D3722F3C53A960A" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_BC284CEFEEA908B04F0722F3C53ACBB1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfFinancialInstrumentsMember" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_BC284CEFEEA908B04F0722F3C53ACBB1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_55C7F3DCF4C53E787D3722F3C53A960A" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_BC284CEFEEA908B04F0722F3C53ACBB1" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ForwardForeignCurrencyContractsMember" xlink:label="loc_cae_ForwardForeignCurrencyContractsMember_A5AAAEE16ADCE2681A4422F3C53AEB7F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_BC284CEFEEA908B04F0722F3C53ACBB1" xlink:to="loc_cae_ForwardForeignCurrencyContractsMember_A5AAAEE16ADCE2681A4422F3C53AEB7F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ForwardForeignCurrencyContractsOutflowMember" xlink:label="loc_cae_ForwardForeignCurrencyContractsOutflowMember_9D99E4FB060656374F5C22F3C53B547A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_BC284CEFEEA908B04F0722F3C53ACBB1" xlink:to="loc_cae_ForwardForeignCurrencyContractsOutflowMember_9D99E4FB060656374F5C22F3C53B547A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ForwardForeignCurrencyContractsInflowMember" xlink:label="loc_cae_ForwardForeignCurrencyContractsInflowMember_345FADBC8F55DB66AC3022F3C53BA7C3" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_BC284CEFEEA908B04F0722F3C53ACBB1" xlink:to="loc_cae_ForwardForeignCurrencyContractsInflowMember_345FADBC8F55DB66AC3022F3C53BA7C3" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SwapDerivativesMember" xlink:label="loc_cae_SwapDerivativesMember_F1289191086AFD7E327D22F3C53B2B62" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_BC284CEFEEA908B04F0722F3C53ACBB1" xlink:to="loc_cae_SwapDerivativesMember_F1289191086AFD7E327D22F3C53B2B62" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EmbeddedForeignCurrencyDerivativesMember" xlink:label="loc_cae_EmbeddedForeignCurrencyDerivativesMember_FF5E3E087A2BFC7731E422F3C53CCD35" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_BC284CEFEEA908B04F0722F3C53ACBB1" xlink:to="loc_cae_EmbeddedForeignCurrencyDerivativesMember_FF5E3E087A2BFC7731E422F3C53CCD35" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EquitySwapAgreementsMember" xlink:label="loc_cae_EquitySwapAgreementsMember_40C78FAC0827B7C5805D22F3C53C74F7" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_BC284CEFEEA908B04F0722F3C53ACBB1" xlink:to="loc_cae_EquitySwapAgreementsMember_40C78FAC0827B7C5805D22F3C53C74F7" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_BalanceSheetLocation1Axis" xlink:label="loc_cae_BalanceSheetLocation1Axis_FC0FFE299829C125D0E022F3C53CEC20" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesTable_D82AB54B676E9DEB9F4922F3C5399E37" xlink:to="loc_cae_BalanceSheetLocation1Axis_FC0FFE299829C125D0E022F3C53CEC20" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_BalanceSheetLocation1Domain" xlink:label="loc_cae_BalanceSheetLocation1Domain_5E8DC05169BAA0F91CAA22F3C53C21E3_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_BalanceSheetLocation1Axis_FC0FFE299829C125D0E022F3C53CEC20" xlink:to="loc_cae_BalanceSheetLocation1Domain_5E8DC05169BAA0F91CAA22F3C53C21E3_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_BalanceSheetLocation1Domain" xlink:label="loc_cae_BalanceSheetLocation1Domain_5E8DC05169BAA0F91CAA22F3C53C21E3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_BalanceSheetLocation1Axis_FC0FFE299829C125D0E022F3C53CEC20" xlink:to="loc_cae_BalanceSheetLocation1Domain_5E8DC05169BAA0F91CAA22F3C53C21E3" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AccountsPayableandAccruedLiabilitiesMember" xlink:label="loc_cae_AccountsPayableandAccruedLiabilitiesMember_BCAF30AD6C63C90C53B422F3C53CFF5B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_BalanceSheetLocation1Domain_5E8DC05169BAA0F91CAA22F3C53C21E3" xlink:to="loc_cae_AccountsPayableandAccruedLiabilitiesMember_BCAF30AD6C63C90C53B422F3C53CFF5B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LongtermBorrowingsMember" xlink:label="loc_ifrs-full_LongtermBorrowingsMember_BBFF0DC62605EFE727B122F3C53D8359" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_BalanceSheetLocation1Domain_5E8DC05169BAA0F91CAA22F3C53C21E3" xlink:to="loc_ifrs-full_LongtermBorrowingsMember_BBFF0DC62605EFE727B122F3C53D8359" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_OtherNonCurrentLiabilitiesMember" xlink:label="loc_cae_OtherNonCurrentLiabilitiesMember_60C3F57F8547EF8A58A822F3C53D985D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_BalanceSheetLocation1Domain_5E8DC05169BAA0F91CAA22F3C53C21E3" xlink:to="loc_cae_OtherNonCurrentLiabilitiesMember_60C3F57F8547EF8A58A822F3C53D985D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MaturityAxis" xlink:label="loc_ifrs-full_MaturityAxis_16FAF94BEB5ED7F0EC1F22F3C53E0093" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesTable_D82AB54B676E9DEB9F4922F3C5399E37" xlink:to="loc_ifrs-full_MaturityAxis_16FAF94BEB5ED7F0EC1F22F3C53E0093" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="loc_ifrs-full_AggregatedTimeBandsMember_C2ECC0FE307A30BA1A7622F3C53E2C64_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MaturityAxis_16FAF94BEB5ED7F0EC1F22F3C53E0093" xlink:to="loc_ifrs-full_AggregatedTimeBandsMember_C2ECC0FE307A30BA1A7622F3C53E2C64_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="loc_ifrs-full_AggregatedTimeBandsMember_C2ECC0FE307A30BA1A7622F3C53E2C64" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MaturityAxis_16FAF94BEB5ED7F0EC1F22F3C53E0093" xlink:to="loc_ifrs-full_AggregatedTimeBandsMember_C2ECC0FE307A30BA1A7622F3C53E2C64" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NotLaterThanOneYearMember" xlink:label="loc_ifrs-full_NotLaterThanOneYearMember_3F4355EECA8E67BE9A3022F3C53E155E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_C2ECC0FE307A30BA1A7622F3C53E2C64" xlink:to="loc_ifrs-full_NotLaterThanOneYearMember_3F4355EECA8E67BE9A3022F3C53E155E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember" xlink:label="loc_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_2859439FCC2FA440A04122F3C53E5C00" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_C2ECC0FE307A30BA1A7622F3C53E2C64" xlink:to="loc_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_2859439FCC2FA440A04122F3C53E5C00" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember" xlink:label="loc_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember_358E89E499447E5D661722F3C53EE012" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_C2ECC0FE307A30BA1A7622F3C53E2C64" xlink:to="loc_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember_358E89E499447E5D661722F3C53EE012" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember" xlink:label="loc_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember_4287C4D8CE1F2050290222F3C53F1935" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_C2ECC0FE307A30BA1A7622F3C53E2C64" xlink:to="loc_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember_4287C4D8CE1F2050290222F3C53F1935" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember" xlink:label="loc_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember_07C2C79EAFAF9F4789AF22F3C53F50CA" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_C2ECC0FE307A30BA1A7622F3C53E2C64" xlink:to="loc_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember_07C2C79EAFAF9F4789AF22F3C53F50CA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanFiveYearsMember" xlink:label="loc_ifrs-full_LaterThanFiveYearsMember_B63CED52D559483DD01F22F3C53FE1F7" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_C2ECC0FE307A30BA1A7622F3C53E2C64" xlink:to="loc_ifrs-full_LaterThanFiveYearsMember_B63CED52D559483DD01F22F3C53FE1F7" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NonderivativeFinancialLiabilitiesCarryingAmount" xlink:label="loc_cae_NonderivativeFinancialLiabilitiesCarryingAmount_8748E9286E9F17E7F9EF22F3C54081C2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesLineItems_CFBF1E96A918268C8B0A22F3C53F743D" xlink:to="loc_cae_NonderivativeFinancialLiabilitiesCarryingAmount_8748E9286E9F17E7F9EF22F3C54081C2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NonderivativeFinancialLiabilitiesUndiscountedCashFlows" xlink:label="loc_ifrs-full_NonderivativeFinancialLiabilitiesUndiscountedCashFlows_2AA95092F3A639CA88FA22F3C540F154" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesLineItems_CFBF1E96A918268C8B0A22F3C53F743D" xlink:to="loc_ifrs-full_NonderivativeFinancialLiabilitiesUndiscountedCashFlows_2AA95092F3A639CA88FA22F3C540F154" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DerivativeFinancialInstrumentsCarryingAmount" xlink:label="loc_cae_DerivativeFinancialInstrumentsCarryingAmount_513827A3F337CD6F117522F3C5409C88" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesLineItems_CFBF1E96A918268C8B0A22F3C53F743D" xlink:to="loc_cae_DerivativeFinancialInstrumentsCarryingAmount_513827A3F337CD6F117522F3C5409C88" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DerivativeFinancialInstrumentsUndiscountedCashFlows" xlink:label="loc_cae_DerivativeFinancialInstrumentsUndiscountedCashFlows_E7826E61397D4BF47B0722F3C5401998" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesLineItems_CFBF1E96A918268C8B0A22F3C53F743D" xlink:to="loc_cae_DerivativeFinancialInstrumentsUndiscountedCashFlows_E7826E61397D4BF47B0722F3C5401998" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NonderivativeFinancialLiabilitiesAndDerivativeFinancialInstrumentsCarryingAmount" xlink:label="loc_cae_NonderivativeFinancialLiabilitiesAndDerivativeFinancialInstrumentsCarryingAmount_FCAC9F903890E03F3F0722F3C541FB43" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesLineItems_CFBF1E96A918268C8B0A22F3C53F743D" xlink:to="loc_cae_NonderivativeFinancialLiabilitiesAndDerivativeFinancialInstrumentsCarryingAmount_FCAC9F903890E03F3F0722F3C541FB43" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NonderivativeFinancialLiabilitiesAndDerivativeFinancialInstrumentsUndiscountedCashFlow" xlink:label="loc_cae_NonderivativeFinancialLiabilitiesAndDerivativeFinancialInstrumentsUndiscountedCashFlow_D52F5BFF76CBF202339222F3C5418A09" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForNonderivativeFinancialLiabilitiesLineItems_CFBF1E96A918268C8B0A22F3C53F743D" xlink:to="loc_cae_NonderivativeFinancialLiabilitiesAndDerivativeFinancialInstrumentsUndiscountedCashFlow_D52F5BFF76CBF202339222F3C5418A09" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/FinancialRiskManagementNetIncomeAndOtherComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems" xlink:label="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems_51D88C03D3549B17360522F3C50307D6" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable" xlink:label="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable_0E2C00A2573C4C0897AE22F3C50011B8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems_51D88C03D3549B17360522F3C50307D6" xlink:to="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable_0E2C00A2573C4C0897AE22F3C50011B8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CurrencyPairingAxis" xlink:label="loc_cae_CurrencyPairingAxis_7B66B4E438F2AE2B468922F3C50035EF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable_0E2C00A2573C4C0897AE22F3C50011B8" xlink:to="loc_cae_CurrencyPairingAxis_7B66B4E438F2AE2B468922F3C50035EF" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CurrencyPairingDomain" xlink:label="loc_cae_CurrencyPairingDomain_63453267E7F2115A918722F3C501B6D2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_CurrencyPairingAxis_7B66B4E438F2AE2B468922F3C50035EF" xlink:to="loc_cae_CurrencyPairingDomain_63453267E7F2115A918722F3C501B6D2_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CurrencyPairingDomain" xlink:label="loc_cae_CurrencyPairingDomain_63453267E7F2115A918722F3C501B6D2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_CurrencyPairingAxis_7B66B4E438F2AE2B468922F3C50035EF" xlink:to="loc_cae_CurrencyPairingDomain_63453267E7F2115A918722F3C501B6D2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_USDCDNMember" xlink:label="loc_cae_USDCDNMember_8F4A15B4339D50872CBC22F3C501A160" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_CurrencyPairingDomain_63453267E7F2115A918722F3C501B6D2" xlink:to="loc_cae_USDCDNMember_8F4A15B4339D50872CBC22F3C501A160" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EURCDNMember" xlink:label="loc_cae_EURCDNMember_D0E927944521251E7B2122F3C5022B22" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_CurrencyPairingDomain_63453267E7F2115A918722F3C501B6D2" xlink:to="loc_cae_EURCDNMember_D0E927944521251E7B2122F3C5022B22" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_GBPCDNMember" xlink:label="loc_cae_GBPCDNMember_CBEBCE925E62BFD154BC22F3C502E319" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_CurrencyPairingDomain_63453267E7F2115A918722F3C501B6D2" xlink:to="loc_cae_GBPCDNMember_CBEBCE925E62BFD154BC22F3C502E319" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfRisksAxis" xlink:label="loc_ifrs-full_TypesOfRisksAxis_BABE87ECF20112E3E20F22F3C5020684" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsTable_0E2C00A2573C4C0897AE22F3C50011B8" xlink:to="loc_ifrs-full_TypesOfRisksAxis_BABE87ECF20112E3E20F22F3C5020684" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfRisksMember" xlink:label="loc_ifrs-full_TypesOfRisksMember_B5275A38615B857D660822F3C5026D09_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_BABE87ECF20112E3E20F22F3C5020684" xlink:to="loc_ifrs-full_TypesOfRisksMember_B5275A38615B857D660822F3C5026D09_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfRisksMember" xlink:label="loc_ifrs-full_TypesOfRisksMember_B5275A38615B857D660822F3C5026D09" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_BABE87ECF20112E3E20F22F3C5020684" xlink:to="loc_ifrs-full_TypesOfRisksMember_B5275A38615B857D660822F3C5026D09" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CurrencyRiskMember" xlink:label="loc_ifrs-full_CurrencyRiskMember_FEA569FFCC9EF594B04322F3C5031BAE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksMember_B5275A38615B857D660822F3C5026D09" xlink:to="loc_ifrs-full_CurrencyRiskMember_FEA569FFCC9EF594B04322F3C5031BAE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProfitLoss" xlink:label="loc_ifrs-full_ProfitLoss_0D976F9AD2169D22BC9922F3C504F7E3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems_51D88C03D3549B17360522F3C50307D6" xlink:to="loc_ifrs-full_ProfitLoss_0D976F9AD2169D22BC9922F3C504F7E3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherComprehensiveIncome" xlink:label="loc_ifrs-full_OtherComprehensiveIncome_4EDB49489D872E8B8FA122F3C50400EB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSensitivityAnalysisForActuarialAssumptionsLineItems_51D88C03D3549B17360522F3C50307D6" xlink:to="loc_ifrs-full_OtherComprehensiveIncome_4EDB49489D872E8B8FA122F3C50400EB" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/FinancialRiskManagementTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/GovernmentParticipation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/GovernmentParticipationAggregateContributionsRecognizedDetails" xlink:type="extended">
    <link:loc xlink:href="cae-20180331.xsd#cae_DisclosureofGovernmentGrantsLineItems" xlink:label="loc_cae_DisclosureofGovernmentGrantsLineItems_DD0194B294E630DFE4AD6E6FF42CD747" xlink:type="locator" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DisclosureofGovernmentGrantsTable" xlink:label="loc_cae_DisclosureofGovernmentGrantsTable_D6119F3E988E83B4CDC86E6FF42A23ED" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cae_DisclosureofGovernmentGrantsLineItems_DD0194B294E630DFE4AD6E6FF42CD747" xlink:to="loc_cae_DisclosureofGovernmentGrantsTable_D6119F3E988E83B4CDC86E6FF42A23ED" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ProgramNameAxis" xlink:label="loc_cae_ProgramNameAxis_7E2420E511E4E08382FB6E6FF42ACC67" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cae_DisclosureofGovernmentGrantsTable_D6119F3E988E83B4CDC86E6FF42A23ED" xlink:to="loc_cae_ProgramNameAxis_7E2420E511E4E08382FB6E6FF42ACC67" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ProgramNameDomain" xlink:label="loc_cae_ProgramNameDomain_83D52D19E4B1C5139C486E6FF42BA83F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_ProgramNameAxis_7E2420E511E4E08382FB6E6FF42ACC67" xlink:to="loc_cae_ProgramNameDomain_83D52D19E4B1C5139C486E6FF42BA83F_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ProgramNameDomain" xlink:label="loc_cae_ProgramNameDomain_83D52D19E4B1C5139C486E6FF42BA83F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_ProgramNameAxis_7E2420E511E4E08382FB6E6FF42ACC67" xlink:to="loc_cae_ProgramNameDomain_83D52D19E4B1C5139C486E6FF42BA83F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ProjectNewCoreMarketsMember" xlink:label="loc_cae_ProjectNewCoreMarketsMember_46AD113856278836AACA6E6FF42B7926" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_ProgramNameDomain_83D52D19E4B1C5139C486E6FF42BA83F" xlink:to="loc_cae_ProjectNewCoreMarketsMember_46AD113856278836AACA6E6FF42B7926" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ProjectInnovateMember" xlink:label="loc_cae_ProjectInnovateMember_390363D6ABADBA6F23366E6FF42BE04A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_ProgramNameDomain_83D52D19E4B1C5139C486E6FF42BA83F" xlink:to="loc_cae_ProjectInnovateMember_390363D6ABADBA6F23366E6FF42BE04A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ProjectSimco4.0Member" xlink:label="loc_cae_ProjectSimco4.0Member_5B6ED738F302A5CCD9596E6FF42CCA65" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_ProgramNameDomain_83D52D19E4B1C5139C486E6FF42BA83F" xlink:to="loc_cae_ProjectSimco4.0Member_5B6ED738F302A5CCD9596E6FF42CCA65" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_GovernmentParticipationContributionsCredittoCapitalizedExpenditures" xlink:label="loc_cae_GovernmentParticipationContributionsCredittoCapitalizedExpenditures_8250D6B582E1A55686CB6E76A2051D06" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_DisclosureofGovernmentGrantsLineItems_DD0194B294E630DFE4AD6E6FF42CD747" xlink:to="loc_cae_GovernmentParticipationContributionsCredittoCapitalizedExpenditures_8250D6B582E1A55686CB6E76A2051D06" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RevenueFromGovernmentGrants" xlink:label="loc_ifrs-full_RevenueFromGovernmentGrants_F5B2A4F23E3A71640CBC6E6FF42C07E9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_DisclosureofGovernmentGrantsLineItems_DD0194B294E630DFE4AD6E6FF42CD747" xlink:to="loc_ifrs-full_RevenueFromGovernmentGrants_F5B2A4F23E3A71640CBC6E6FF42C07E9" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_GovernmentParticipationContributions" xlink:label="loc_cae_GovernmentParticipationContributions_E33630842173F561BB116E77FAC9AF5E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_DisclosureofGovernmentGrantsLineItems_DD0194B294E630DFE4AD6E6FF42CD747" xlink:to="loc_cae_GovernmentParticipationContributions_E33630842173F561BB116E77FAC9AF5E" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/GovernmentParticipationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="cae-20180331.xsd#cae_DisclosureofGovernmentGrantsLineItems" xlink:label="loc_cae_DisclosureofGovernmentGrantsLineItems_81EF5B6EDC357B1E9844B2277B84E7F6" xlink:type="locator" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DisclosureofGovernmentGrantsTable" xlink:label="loc_cae_DisclosureofGovernmentGrantsTable_5E1BC96D5DEE4F8DD8F4B2277B8222AD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cae_DisclosureofGovernmentGrantsLineItems_81EF5B6EDC357B1E9844B2277B84E7F6" xlink:to="loc_cae_DisclosureofGovernmentGrantsTable_5E1BC96D5DEE4F8DD8F4B2277B8222AD" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ProgramNameAxis" xlink:label="loc_cae_ProgramNameAxis_41E003DC00C633F32A47B2277B838470" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cae_DisclosureofGovernmentGrantsTable_5E1BC96D5DEE4F8DD8F4B2277B8222AD" xlink:to="loc_cae_ProgramNameAxis_41E003DC00C633F32A47B2277B838470" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ProgramNameDomain" xlink:label="loc_cae_ProgramNameDomain_DD6F1C2A5E3F7F08D5C7B2277B830585_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_ProgramNameAxis_41E003DC00C633F32A47B2277B838470" xlink:to="loc_cae_ProgramNameDomain_DD6F1C2A5E3F7F08D5C7B2277B830585_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ProgramNameDomain" xlink:label="loc_cae_ProgramNameDomain_DD6F1C2A5E3F7F08D5C7B2277B830585" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_ProgramNameAxis_41E003DC00C633F32A47B2277B838470" xlink:to="loc_cae_ProgramNameDomain_DD6F1C2A5E3F7F08D5C7B2277B830585" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ProjectInnovateMember" xlink:label="loc_cae_ProjectInnovateMember_CD87E158FA89904E37B8B2277B836992" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_ProgramNameDomain_DD6F1C2A5E3F7F08D5C7B2277B830585" xlink:to="loc_cae_ProjectInnovateMember_CD87E158FA89904E37B8B2277B836992" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ProjectNewCoreMarketsMember" xlink:label="loc_cae_ProjectNewCoreMarketsMember_644ABF29CB6AD3592ABEB2277B840659" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_ProgramNameDomain_DD6F1C2A5E3F7F08D5C7B2277B830585" xlink:to="loc_cae_ProjectNewCoreMarketsMember_644ABF29CB6AD3592ABEB2277B840659" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ProjectSimco4.0Member" xlink:label="loc_cae_ProjectSimco4.0Member_967C2F22C79EB7C20C25B2277B84A539" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_ProgramNameDomain_DD6F1C2A5E3F7F08D5C7B2277B830585" xlink:to="loc_cae_ProjectSimco4.0Member_967C2F22C79EB7C20C25B2277B84A539" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Borrowings" xlink:label="loc_ifrs-full_Borrowings_E28A2A50BDB1C15F8F25B22C5D6B03C6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_DisclosureofGovernmentGrantsLineItems_81EF5B6EDC357B1E9844B2277B84E7F6" xlink:to="loc_ifrs-full_Borrowings_E28A2A50BDB1C15F8F25B22C5D6B03C6" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_GovernmentParticipationProgramTerm" xlink:label="loc_cae_GovernmentParticipationProgramTerm_F4CB322C943D80746830B2277B84EB97" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_DisclosureofGovernmentGrantsLineItems_81EF5B6EDC357B1E9844B2277B84E7F6" xlink:to="loc_cae_GovernmentParticipationProgramTerm_F4CB322C943D80746830B2277B84EB97" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GovernmentGrants" xlink:label="loc_ifrs-full_GovernmentGrants_9FBE709F258E4F6DA4ACB2277B857840" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_DisclosureofGovernmentGrantsLineItems_81EF5B6EDC357B1E9844B2277B84E7F6" xlink:to="loc_ifrs-full_GovernmentGrants_9FBE709F258E4F6DA4ACB2277B857840" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_GovernmentParticipationPercentofEligibleCostsCommittedContributions" xlink:label="loc_cae_GovernmentParticipationPercentofEligibleCostsCommittedContributions_71E62BA129D9DD44F212B2277B85BC74" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_DisclosureofGovernmentGrantsLineItems_81EF5B6EDC357B1E9844B2277B84E7F6" xlink:to="loc_cae_GovernmentParticipationPercentofEligibleCostsCommittedContributions_71E62BA129D9DD44F212B2277B85BC74" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/GovernmentParticipationNetContributionsRecognizedAndAmountsNotYetReceivedDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/GovernmentParticipationTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/ImpairmentOfNonfinancialAssets" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/ImpairmentOfNonfinancialAssetsChangesInGoodwillDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillLineItems" xlink:label="loc_ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillLineItems_43CFF1A797A7AE6A1DF522F3C6C72221" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillTable" xlink:label="loc_ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillTable_FFB90E53FBADC374ED9522F3C6C52D9C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillLineItems_43CFF1A797A7AE6A1DF522F3C6C72221" xlink:to="loc_ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillTable_FFB90E53FBADC374ED9522F3C6C52D9C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis" xlink:label="loc_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis_CBF8C93C019B18932DA322F3C6C5AC29" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillTable_FFB90E53FBADC374ED9522F3C6C52D9C" xlink:to="loc_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis_CBF8C93C019B18932DA322F3C6C5AC29" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsAndGoodwillMember" xlink:label="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_AAE675C8AA4EE784E78C22F3C6C5BDD0_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis_CBF8C93C019B18932DA322F3C6C5AC29" xlink:to="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_AAE675C8AA4EE784E78C22F3C6C5BDD0_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsAndGoodwillMember" xlink:label="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_AAE675C8AA4EE784E78C22F3C6C5BDD0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis_CBF8C93C019B18932DA322F3C6C5AC29" xlink:to="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_AAE675C8AA4EE784E78C22F3C6C5BDD0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GoodwillMember" xlink:label="loc_ifrs-full_GoodwillMember_05C6EA0821CFE77D492B22F3C6C6DE01" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_AAE675C8AA4EE784E78C22F3C6C5BDD0" xlink:to="loc_ifrs-full_GoodwillMember_05C6EA0821CFE77D492B22F3C6C6DE01" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentsAxis" xlink:label="loc_ifrs-full_SegmentsAxis_9969DF902DE50D86B44922F3C6C6E19E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillTable_FFB90E53FBADC374ED9522F3C6C52D9C" xlink:to="loc_ifrs-full_SegmentsAxis_9969DF902DE50D86B44922F3C6C6E19E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentsMember" xlink:label="loc_ifrs-full_SegmentsMember_C6B7F6C605527D19210A22F3C6C6ACE7_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentsAxis_9969DF902DE50D86B44922F3C6C6E19E" xlink:to="loc_ifrs-full_SegmentsMember_C6B7F6C605527D19210A22F3C6C6ACE7_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentsMember" xlink:label="loc_ifrs-full_SegmentsMember_C6B7F6C605527D19210A22F3C6C6ACE7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentsAxis_9969DF902DE50D86B44922F3C6C6E19E" xlink:to="loc_ifrs-full_SegmentsMember_C6B7F6C605527D19210A22F3C6C6ACE7" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CivilAviationTrainingSolutionsMember" xlink:label="loc_cae_CivilAviationTrainingSolutionsMember_4E78CC9E0800DCF77DE022F3C6C6ADC5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsMember_C6B7F6C605527D19210A22F3C6C6ACE7" xlink:to="loc_cae_CivilAviationTrainingSolutionsMember_4E78CC9E0800DCF77DE022F3C6C6ADC5" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DefenseandSecurityMember" xlink:label="loc_cae_DefenseandSecurityMember_DE018E597560F247CC6722F3C6C7C6DB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsMember_C6B7F6C605527D19210A22F3C6C6ACE7" xlink:to="loc_cae_DefenseandSecurityMember_DE018E597560F247CC6722F3C6C7C6DB" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_HealthcareMember" xlink:label="loc_cae_HealthcareMember_CECEB6D30DDA4237B35E22F3C6C7D45A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsMember_C6B7F6C605527D19210A22F3C6C6ACE7" xlink:to="loc_cae_HealthcareMember_CECEB6D30DDA4237B35E22F3C6C7D45A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Goodwill" xlink:label="loc_ifrs-full_Goodwill_01E6F4DC7FA06F4DE3E122F3C6C7CE01" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillLineItems_43CFF1A797A7AE6A1DF522F3C6C72221" xlink:to="loc_ifrs-full_Goodwill_01E6F4DC7FA06F4DE3E122F3C6C7CE01" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsAndGoodwill" xlink:label="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsAndGoodwill_B7E6EC864C4F7AD2534F22F3C6C87D88" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillLineItems_43CFF1A797A7AE6A1DF522F3C6C72221" xlink:to="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsAndGoodwill_B7E6EC864C4F7AD2534F22F3C6C87D88" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DisposalAndRemeasurementOfInterestInInvestment" xlink:label="loc_cae_DisposalAndRemeasurementOfInterestInInvestment_42AE70B0EF094A5000E822F3C6C8AC59" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillLineItems_43CFF1A797A7AE6A1DF522F3C6C72221" xlink:to="loc_cae_DisposalAndRemeasurementOfInterestInInvestment_42AE70B0EF094A5000E822F3C6C8AC59" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsAndGoodwill" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsAndGoodwill_84321CCD58EDDFE4F0FF22F3C6C831BA" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillLineItems_43CFF1A797A7AE6A1DF522F3C6C72221" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsAndGoodwill_84321CCD58EDDFE4F0FF22F3C6C831BA" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/ImpairmentOfNonfinancialAssetsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillLineItems" xlink:label="loc_ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillLineItems_329DC26A3CE2659F57CAFF7C218D24D1" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillTable" xlink:label="loc_ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillTable_92F30EEECB3B1B6FBF7EFF7C218BF67D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillLineItems_329DC26A3CE2659F57CAFF7C218D24D1" xlink:to="loc_ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillTable_92F30EEECB3B1B6FBF7EFF7C218BF67D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentsAxis" xlink:label="loc_ifrs-full_SegmentsAxis_8A79E106CEB0B267CB32FF7C218B216C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillTable_92F30EEECB3B1B6FBF7EFF7C218BF67D" xlink:to="loc_ifrs-full_SegmentsAxis_8A79E106CEB0B267CB32FF7C218B216C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentsMember" xlink:label="loc_ifrs-full_SegmentsMember_5B6DCA843B5BD2F2F8F0FF7C218CF80A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentsAxis_8A79E106CEB0B267CB32FF7C218B216C" xlink:to="loc_ifrs-full_SegmentsMember_5B6DCA843B5BD2F2F8F0FF7C218CF80A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentsMember" xlink:label="loc_ifrs-full_SegmentsMember_5B6DCA843B5BD2F2F8F0FF7C218CF80A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentsAxis_8A79E106CEB0B267CB32FF7C218B216C" xlink:to="loc_ifrs-full_SegmentsMember_5B6DCA843B5BD2F2F8F0FF7C218CF80A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CivilAviationTrainingSolutionsDefenseandSecurityandHealthcareMember" xlink:label="loc_cae_CivilAviationTrainingSolutionsDefenseandSecurityandHealthcareMember_4D1ED43C43CE0E4744B4FF7C218C0B82" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsMember_5B6DCA843B5BD2F2F8F0FF7C218CF80A" xlink:to="loc_cae_CivilAviationTrainingSolutionsDefenseandSecurityandHealthcareMember_4D1ED43C43CE0E4744B4FF7C218C0B82" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangeAxis" xlink:label="loc_ifrs-full_RangeAxis_40897F8C0472533239F5FF7C218C7E62" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillTable_92F30EEECB3B1B6FBF7EFF7C218BF67D" xlink:to="loc_ifrs-full_RangeAxis_40897F8C0472533239F5FF7C218C7E62" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="loc_ifrs-full_RangesMember_60B3EC19F265BD631535FF7C218D1FF5_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_40897F8C0472533239F5FF7C218C7E62" xlink:to="loc_ifrs-full_RangesMember_60B3EC19F265BD631535FF7C218D1FF5_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="loc_ifrs-full_RangesMember_60B3EC19F265BD631535FF7C218D1FF5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_40897F8C0472533239F5FF7C218C7E62" xlink:to="loc_ifrs-full_RangesMember_60B3EC19F265BD631535FF7C218D1FF5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BottomOfRangeMember" xlink:label="loc_ifrs-full_BottomOfRangeMember_DE0264371F91738566F0FF7C218D4959" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesMember_60B3EC19F265BD631535FF7C218D1FF5" xlink:to="loc_ifrs-full_BottomOfRangeMember_DE0264371F91738566F0FF7C218D4959" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TopOfRangeMember" xlink:label="loc_ifrs-full_TopOfRangeMember_7C350E6D729998C35599FF7C218D7C6E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesMember_60B3EC19F265BD631535FF7C218D1FF5" xlink:to="loc_ifrs-full_TopOfRangeMember_7C350E6D729998C35599FF7C218D7C6E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_GrowthRateUsedToExtrapolateCashFlowProjectionsPeriod" xlink:label="loc_cae_GrowthRateUsedToExtrapolateCashFlowProjectionsPeriod_2E10BC3DCDA62257652FFF7C218DFE8E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillLineItems_329DC26A3CE2659F57CAFF7C218D24D1" xlink:to="loc_cae_GrowthRateUsedToExtrapolateCashFlowProjectionsPeriod_2E10BC3DCDA62257652FFF7C218DFE8E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections" xlink:label="loc_ifrs-full_DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections_F7C53632AFE7F5EAFD26FF7C218E927F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillLineItems_329DC26A3CE2659F57CAFF7C218D24D1" xlink:to="loc_ifrs-full_DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections_F7C53632AFE7F5EAFD26FF7C218E927F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections" xlink:label="loc_ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections_75C0FB06904D6A4839A5FF7C218E4039" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInGoodwillLineItems_329DC26A3CE2659F57CAFF7C218D24D1" xlink:to="loc_ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections_75C0FB06904D6A4839A5FF7C218E4039" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/ImpairmentOfNonfinancialAssetsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/IncomeTaxes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/IncomeTaxesComponentsOfProvisionForIncomeTaxExpenseDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/IncomeTaxesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems" xlink:label="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_B7442FAD69CDE6AA0530BBBFC959AFDE" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable" xlink:label="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable_1487DCA41EEE941D253BBBBFC9586F5D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_B7442FAD69CDE6AA0530BBBFC959AFDE" xlink:to="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable_1487DCA41EEE941D253BBBBFC9586F5D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_B671FF0377B28F627635BBBFC959720D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable_1487DCA41EEE941D253BBBBFC9586F5D" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_B671FF0377B28F627635BBBFC959720D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EquityMember" xlink:label="loc_ifrs-full_EquityMember_8C57AAE0017827101F81BBBFC959E273_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_B671FF0377B28F627635BBBFC959720D" xlink:to="loc_ifrs-full_EquityMember_8C57AAE0017827101F81BBBFC959E273_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EquityMember" xlink:label="loc_ifrs-full_EquityMember_8C57AAE0017827101F81BBBFC959E273" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_B671FF0377B28F627635BBBFC959720D" xlink:to="loc_ifrs-full_EquityMember_8C57AAE0017827101F81BBBFC959E273" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_ifrs-full_AccumulatedOtherComprehensiveIncomeMember_D7CD3AC94D1B63B62EE7BBBFC9598470" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_8C57AAE0017827101F81BBBFC959E273" xlink:to="loc_ifrs-full_AccumulatedOtherComprehensiveIncomeMember_D7CD3AC94D1B63B62EE7BBBFC9598470" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ApplicableTaxRate" xlink:label="loc_ifrs-full_ApplicableTaxRate_431BCBD0CDB8C4406A5CBBBFC95A946E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_B7442FAD69CDE6AA0530BBBFC959AFDE" xlink:to="loc_ifrs-full_ApplicableTaxRate_431BCBD0CDB8C4406A5CBBBFC95A946E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TaxCutsandJobsActChangeinTaxRateIncomeTaxExpenseBenefit" xlink:label="loc_cae_TaxCutsandJobsActChangeinTaxRateIncomeTaxExpenseBenefit_AE1B888059AD5190E7A9BBBFC95B4DF4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_B7442FAD69CDE6AA0530BBBFC959AFDE" xlink:to="loc_cae_TaxCutsandJobsActChangeinTaxRateIncomeTaxExpenseBenefit_AE1B888059AD5190E7A9BBBFC95B4DF4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DeferredTaxExpenseIncome" xlink:label="loc_ifrs-full_DeferredTaxExpenseIncome_0221C2586ADC47A6E78DBBBFC95A1E68" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_B7442FAD69CDE6AA0530BBBFC959AFDE" xlink:to="loc_ifrs-full_DeferredTaxExpenseIncome_0221C2586ADC47A6E78DBBBFC95A1E68" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CurrentTaxExpenseIncome" xlink:label="loc_ifrs-full_CurrentTaxExpenseIncome_671CD78421FEA25BDAABBBBFC95AB81D" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_B7442FAD69CDE6AA0530BBBFC959AFDE" xlink:to="loc_ifrs-full_CurrentTaxExpenseIncome_671CD78421FEA25BDAABBBBFC95AB81D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TemporaryDifferencesAssociatedWithInvestmentsInSubsidiariesBranchesAndAssociatesAndInterestsInJointVentures" xlink:label="loc_ifrs-full_TemporaryDifferencesAssociatedWithInvestmentsInSubsidiariesBranchesAndAssociatesAndInterestsInJointVentures_3EEFE1DCE2D95F0B63B6BBBFC959D9B4" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_B7442FAD69CDE6AA0530BBBFC959AFDE" xlink:to="loc_ifrs-full_TemporaryDifferencesAssociatedWithInvestmentsInSubsidiariesBranchesAndAssociatesAndInterestsInJointVentures_3EEFE1DCE2D95F0B63B6BBBFC959D9B4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised" xlink:label="loc_ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised_F24A3B402D380AFFE0BEBBBFC95A022F" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_B7442FAD69CDE6AA0530BBBFC959AFDE" xlink:to="loc_ifrs-full_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised_F24A3B402D380AFFE0BEBBBFC95A022F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognisedPeriod" xlink:label="loc_cae_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognisedPeriod_10DA38333163D68D934DBBBFC95A401A" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_B7442FAD69CDE6AA0530BBBFC959AFDE" xlink:to="loc_cae_DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognisedPeriod_10DA38333163D68D934DBBBFC95A401A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AccumulatedCapitalLossesForWhichNoDeferredTaxAssetIsRecognised" xlink:label="loc_cae_AccumulatedCapitalLossesForWhichNoDeferredTaxAssetIsRecognised_F43C6F64965A9CD148E7BBBFC95B7778" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_B7442FAD69CDE6AA0530BBBFC959AFDE" xlink:to="loc_cae_AccumulatedCapitalLossesForWhichNoDeferredTaxAssetIsRecognised_F43C6F64965A9CD148E7BBBFC95B7778" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/IncomeTaxesMovementsInTemporaryDifferencesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems" xlink:label="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_5DC510CAD48797A2F32122F3C725F609" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable" xlink:label="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable_25B95BD753DF24CC079322F3C7203F15" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_5DC510CAD48797A2F32122F3C725F609" xlink:to="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable_25B95BD753DF24CC079322F3C7203F15" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis" xlink:label="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_4EC7EBCA15744FE9F99922F3C720B8F1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable_25B95BD753DF24CC079322F3C7203F15" xlink:to="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_4EC7EBCA15744FE9F99922F3C720B8F1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember" xlink:label="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_25EE86BDC659682B215F22F3C7215C3E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_4EC7EBCA15744FE9F99922F3C720B8F1" xlink:to="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_25EE86BDC659682B215F22F3C7215C3E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember" xlink:label="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_25EE86BDC659682B215F22F3C7215C3E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis_4EC7EBCA15744FE9F99922F3C720B8F1" xlink:to="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_25EE86BDC659682B215F22F3C7215C3E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_UnusedTaxLossesMember" xlink:label="loc_ifrs-full_UnusedTaxLossesMember_B3369C947023CD5FAD1722F3C721387A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_25EE86BDC659682B215F22F3C7215C3E" xlink:to="loc_ifrs-full_UnusedTaxLossesMember_B3369C947023CD5FAD1722F3C721387A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_IntangibleAssetsRelatedTemporaryDifferencesMember" xlink:label="loc_cae_IntangibleAssetsRelatedTemporaryDifferencesMember_7C4CA661B9599F2A15B322F3C7210DF2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_25EE86BDC659682B215F22F3C7215C3E" xlink:to="loc_cae_IntangibleAssetsRelatedTemporaryDifferencesMember_7C4CA661B9599F2A15B322F3C7210DF2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AmountsNotCurrentlyDeductibleRelatedTemporaryDifferencesMember" xlink:label="loc_cae_AmountsNotCurrentlyDeductibleRelatedTemporaryDifferencesMember_21F9A06297BB8D7B020122F3C7223637" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_25EE86BDC659682B215F22F3C7215C3E" xlink:to="loc_cae_AmountsNotCurrentlyDeductibleRelatedTemporaryDifferencesMember_21F9A06297BB8D7B020122F3C7223637" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DeferredRevenueRelatedTemporaryDifferencesMember" xlink:label="loc_cae_DeferredRevenueRelatedTemporaryDifferencesMember_9C6709BDCD53098405D422F3C7228950" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_25EE86BDC659682B215F22F3C7215C3E" xlink:to="loc_cae_DeferredRevenueRelatedTemporaryDifferencesMember_9C6709BDCD53098405D422F3C7228950" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TaxBenefitCarryoverRelatedTemporaryDifferencesMember" xlink:label="loc_cae_TaxBenefitCarryoverRelatedTemporaryDifferencesMember_E3BD9451FBC3C2D970A622F3C722CB73" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_25EE86BDC659682B215F22F3C7215C3E" xlink:to="loc_cae_TaxBenefitCarryoverRelatedTemporaryDifferencesMember_E3BD9451FBC3C2D970A622F3C722CB73" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_UnclaimedResearchAndDevelopmentExpendituresRelatedTemporaryDifferencesMember" xlink:label="loc_cae_UnclaimedResearchAndDevelopmentExpendituresRelatedTemporaryDifferencesMember_78E18E4D8C9965566B4822F3C7234D94" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_25EE86BDC659682B215F22F3C7215C3E" xlink:to="loc_cae_UnclaimedResearchAndDevelopmentExpendituresRelatedTemporaryDifferencesMember_78E18E4D8C9965566B4822F3C7234D94" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_InvestmentTaxCreditsRelatedTemporaryDifferencesMember" xlink:label="loc_cae_InvestmentTaxCreditsRelatedTemporaryDifferencesMember_39C95271C45DBDB1460222F3C723D0F9" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_25EE86BDC659682B215F22F3C7215C3E" xlink:to="loc_cae_InvestmentTaxCreditsRelatedTemporaryDifferencesMember_39C95271C45DBDB1460222F3C723D0F9" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PropertyPlantAndEquipmentRelatedTemporaryDifferencesMember" xlink:label="loc_cae_PropertyPlantAndEquipmentRelatedTemporaryDifferencesMember_AC587D14BD413B700EA222F3C7238F83" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_25EE86BDC659682B215F22F3C7215C3E" xlink:to="loc_cae_PropertyPlantAndEquipmentRelatedTemporaryDifferencesMember_AC587D14BD413B700EA222F3C7238F83" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_UnrealisedForeignExchangeGainsLossesMember" xlink:label="loc_ifrs-full_UnrealisedForeignExchangeGainsLossesMember_7573BCC5FEA3C3C3980322F3C7239507" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_25EE86BDC659682B215F22F3C7215C3E" xlink:to="loc_ifrs-full_UnrealisedForeignExchangeGainsLossesMember_7573BCC5FEA3C3C3980322F3C7239507" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FinancialInstrumentsRelatedTemporaryDifferencesMember" xlink:label="loc_cae_FinancialInstrumentsRelatedTemporaryDifferencesMember_CD29C6B138B5E53087C422F3C724D6CA" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_25EE86BDC659682B215F22F3C7215C3E" xlink:to="loc_cae_FinancialInstrumentsRelatedTemporaryDifferencesMember_CD29C6B138B5E53087C422F3C724D6CA" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_GovernmentParticipationRelatedTemporaryDifferencesMember" xlink:label="loc_cae_GovernmentParticipationRelatedTemporaryDifferencesMember_2FBC12FD9D03A21480E222F3C724C66B" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_25EE86BDC659682B215F22F3C7215C3E" xlink:to="loc_cae_GovernmentParticipationRelatedTemporaryDifferencesMember_2FBC12FD9D03A21480E222F3C724C66B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EmployeeBenefitPlansRelatedTemporaryDifferencesMember" xlink:label="loc_cae_EmployeeBenefitPlansRelatedTemporaryDifferencesMember_44D5BD6F556BBCBEBD1722F3C7247FB2" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_25EE86BDC659682B215F22F3C7215C3E" xlink:to="loc_cae_EmployeeBenefitPlansRelatedTemporaryDifferencesMember_44D5BD6F556BBCBEBD1722F3C7247FB2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PercentageofCompletionVersusCompletedContractRelatedTemporaryDifferencesMember" xlink:label="loc_cae_PercentageofCompletionVersusCompletedContractRelatedTemporaryDifferencesMember_F5A7AC1D71A4A33E060222F3C725F19E" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_25EE86BDC659682B215F22F3C7215C3E" xlink:to="loc_cae_PercentageofCompletionVersusCompletedContractRelatedTemporaryDifferencesMember_F5A7AC1D71A4A33E060222F3C725F19E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherTemporaryDifferencesMember" xlink:label="loc_ifrs-full_OtherTemporaryDifferencesMember_22886041459BE7E650CF22F3C72576AD" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember_25EE86BDC659682B215F22F3C7215C3E" xlink:to="loc_ifrs-full_OtherTemporaryDifferencesMember_22886041459BE7E650CF22F3C72576AD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DeferredTaxLiabilityAsset" xlink:label="loc_ifrs-full_DeferredTaxLiabilityAsset_76BAD097E3E90690677222F3C72545B7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_5DC510CAD48797A2F32122F3C725F609" xlink:to="loc_ifrs-full_DeferredTaxLiabilityAsset_76BAD097E3E90690677222F3C72545B7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss" xlink:label="loc_ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss_5CDD934B51D1941EF8A222F3C7267601" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_5DC510CAD48797A2F32122F3C725F609" xlink:to="loc_ifrs-full_DeferredTaxExpenseIncomeRecognisedInProfitOrLoss_5CDD934B51D1941EF8A222F3C7267601" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome" xlink:label="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome_59C6C1B5B20AA496B04D22F3C7266E07" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_5DC510CAD48797A2F32122F3C725F609" xlink:to="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome_59C6C1B5B20AA496B04D22F3C7266E07" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_IncreaseDecreaseThroughDiscontinuedOperationAndTransferredFromAssetsHeldForSale" xlink:label="loc_cae_IncreaseDecreaseThroughDiscontinuedOperationAndTransferredFromAssetsHeldForSale_60D1A2680BC2F00EDAB122F3C7268402" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_5DC510CAD48797A2F32122F3C725F609" xlink:to="loc_cae_IncreaseDecreaseThroughDiscontinuedOperationAndTransferredFromAssetsHeldForSale_60D1A2680BC2F00EDAB122F3C7268402" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset_75AC7995AEFF0D99492422F3C7269D60" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_5DC510CAD48797A2F32122F3C725F609" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughBusinessCombinationsDeferredTaxLiabilityAsset_75AC7995AEFF0D99492422F3C7269D60" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesDeferredTaxLiabilityAsset" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesDeferredTaxLiabilityAsset_2AA0E35A19F120525B5722F3C7271A37" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_5DC510CAD48797A2F32122F3C725F609" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesDeferredTaxLiabilityAsset_2AA0E35A19F120525B5722F3C7271A37" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/IncomeTaxesNonCapitalLossesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems" xlink:label="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_742CBB0BEBEB1C7B680DFF7C21D15010" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable" xlink:label="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable_23E4CBE8406A8845E145FF7C21CED53F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_742CBB0BEBEB1C7B680DFF7C21D15010" xlink:to="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable_23E4CBE8406A8845E145FF7C21CED53F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TaxPeriod1Axis" xlink:label="loc_cae_TaxPeriod1Axis_EBDD6404E79FEC5D9003FF7C21CE446B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable_23E4CBE8406A8845E145FF7C21CED53F" xlink:to="loc_cae_TaxPeriod1Axis_EBDD6404E79FEC5D9003FF7C21CE446B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TaxPeriod1Domain" xlink:label="loc_cae_TaxPeriod1Domain_956697C9FADE0E8C21ACFF7C21CEF64D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_TaxPeriod1Axis_EBDD6404E79FEC5D9003FF7C21CE446B" xlink:to="loc_cae_TaxPeriod1Domain_956697C9FADE0E8C21ACFF7C21CEF64D_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TaxPeriod1Domain" xlink:label="loc_cae_TaxPeriod1Domain_956697C9FADE0E8C21ACFF7C21CEF64D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_TaxPeriod1Axis_EBDD6404E79FEC5D9003FF7C21CE446B" xlink:to="loc_cae_TaxPeriod1Domain_956697C9FADE0E8C21ACFF7C21CEF64D" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TaxYear2019Member" xlink:label="loc_cae_TaxYear2019Member_7FFAEEC043ABB8335399FF7C21CFABBC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_TaxPeriod1Domain_956697C9FADE0E8C21ACFF7C21CEF64D" xlink:to="loc_cae_TaxYear2019Member_7FFAEEC043ABB8335399FF7C21CFABBC" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TaxYear2020Member" xlink:label="loc_cae_TaxYear2020Member_13B676D3DD3E2F9BEE7AFF7C21CF855B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_TaxPeriod1Domain_956697C9FADE0E8C21ACFF7C21CEF64D" xlink:to="loc_cae_TaxYear2020Member_13B676D3DD3E2F9BEE7AFF7C21CF855B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TaxYear2021Member" xlink:label="loc_cae_TaxYear2021Member_0D69B7F632C1EF8D4DE5FF7C21CF4CC2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_TaxPeriod1Domain_956697C9FADE0E8C21ACFF7C21CEF64D" xlink:to="loc_cae_TaxYear2021Member_0D69B7F632C1EF8D4DE5FF7C21CF4CC2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TaxYear2022Member" xlink:label="loc_cae_TaxYear2022Member_46B84E0B2BA39CD3EAABFF7C21D079E1" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_TaxPeriod1Domain_956697C9FADE0E8C21ACFF7C21CEF64D" xlink:to="loc_cae_TaxYear2022Member_46B84E0B2BA39CD3EAABFF7C21D079E1" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TaxYear2023Member" xlink:label="loc_cae_TaxYear2023Member_08BC2D40D7D0F8E3E7F9FF7C21D068E8" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_TaxPeriod1Domain_956697C9FADE0E8C21ACFF7C21CEF64D" xlink:to="loc_cae_TaxYear2023Member_08BC2D40D7D0F8E3E7F9FF7C21D068E8" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TaxYear2024Member" xlink:label="loc_cae_TaxYear2024Member_006345163C79DE93658BFF7C21D0CC21" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_TaxPeriod1Domain_956697C9FADE0E8C21ACFF7C21CEF64D" xlink:to="loc_cae_TaxYear2024Member_006345163C79DE93658BFF7C21D0CC21" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TaxYear20242037Member" xlink:label="loc_cae_TaxYear20242037Member_CEE693AA15FFD147E3D2FF7C21D06F8F" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_TaxPeriod1Domain_956697C9FADE0E8C21ACFF7C21CEF64D" xlink:to="loc_cae_TaxYear20242037Member_CEE693AA15FFD147E3D2FF7C21D06F8F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_IndefiniteTaxYearMember" xlink:label="loc_cae_IndefiniteTaxYearMember_3EE34E8A3338D4E1DFC7FF7C21D197EA" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_TaxPeriod1Domain_956697C9FADE0E8C21ACFF7C21CEF64D" xlink:to="loc_cae_IndefiniteTaxYearMember_3EE34E8A3338D4E1DFC7FF7C21D197EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised" xlink:label="loc_ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised_4B3C1406F61BF19EED1BFF7C21D181C8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_742CBB0BEBEB1C7B680DFF7C21D15010" xlink:to="loc_ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised_4B3C1406F61BF19EED1BFF7C21D181C8" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_UnusedTaxLossesForWhichDeferredTaxAssetRecognised" xlink:label="loc_cae_UnusedTaxLossesForWhichDeferredTaxAssetRecognised_F0DF5BDA597A3D39F9A0FF7C21D16B47" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems_742CBB0BEBEB1C7B680DFF7C21D15010" xlink:to="loc_cae_UnusedTaxLossesForWhichDeferredTaxAssetRecognised_F0DF5BDA597A3D39F9A0FF7C21D16B47" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/IncomeTaxesReconciliationOfIncomeTaxesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/IncomeTaxesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/IntangibleAssets" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/IntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems" xlink:label="loc_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems_CA12DE7480D66EEEDBF71E8CBD415960" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable" xlink:label="loc_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable_2933188DD48695ED1D301E8CBD3C7E7A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems_CA12DE7480D66EEEDBF71E8CBD415960" xlink:to="loc_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable_2933188DD48695ED1D301E8CBD3C7E7A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MethodsOfGenerationAxis" xlink:label="loc_ifrs-full_MethodsOfGenerationAxis_A0B0C27EABD2F804CC301E8CBD3C4E3B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable_2933188DD48695ED1D301E8CBD3C7E7A" xlink:to="loc_ifrs-full_MethodsOfGenerationAxis_A0B0C27EABD2F804CC301E8CBD3C4E3B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MethodsOfGenerationMember" xlink:label="loc_ifrs-full_MethodsOfGenerationMember_BB870AEB6B999250FAB61E8CBD3C6F96_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MethodsOfGenerationAxis_A0B0C27EABD2F804CC301E8CBD3C4E3B" xlink:to="loc_ifrs-full_MethodsOfGenerationMember_BB870AEB6B999250FAB61E8CBD3C6F96_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MethodsOfGenerationMember" xlink:label="loc_ifrs-full_MethodsOfGenerationMember_BB870AEB6B999250FAB61E8CBD3C6F96" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MethodsOfGenerationAxis_A0B0C27EABD2F804CC301E8CBD3C4E3B" xlink:to="loc_ifrs-full_MethodsOfGenerationMember_BB870AEB6B999250FAB61E8CBD3C6F96" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InternallyGeneratedMember" xlink:label="loc_ifrs-full_InternallyGeneratedMember_DE185DEBB1A5BD16533A1E8CBD3D8257" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MethodsOfGenerationMember_BB870AEB6B999250FAB61E8CBD3C6F96" xlink:to="loc_ifrs-full_InternallyGeneratedMember_DE185DEBB1A5BD16533A1E8CBD3D8257" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NotInternallyGeneratedMember" xlink:label="loc_ifrs-full_NotInternallyGeneratedMember_2DD5C3C998C0310C19A21E8CBD3DD15C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MethodsOfGenerationMember_BB870AEB6B999250FAB61E8CBD3C6F96" xlink:to="loc_ifrs-full_NotInternallyGeneratedMember_2DD5C3C998C0310C19A21E8CBD3DD15C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis" xlink:label="loc_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis_1B429E86485C327E51D11E8CBD3DDCE0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable_2933188DD48695ED1D301E8CBD3C7E7A" xlink:to="loc_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis_1B429E86485C327E51D11E8CBD3DDCE0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsAndGoodwillMember" xlink:label="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_98EE8DD1271329050AC81E8CBD3D4198_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis_1B429E86485C327E51D11E8CBD3DDCE0" xlink:to="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_98EE8DD1271329050AC81E8CBD3D4198_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsAndGoodwillMember" xlink:label="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_98EE8DD1271329050AC81E8CBD3D4198" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis_1B429E86485C327E51D11E8CBD3DDCE0" xlink:to="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_98EE8DD1271329050AC81E8CBD3D4198" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GoodwillMember" xlink:label="loc_ifrs-full_GoodwillMember_C00A5407071A3F389F241E8CBD3D3F30" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_98EE8DD1271329050AC81E8CBD3D4198" xlink:to="loc_ifrs-full_GoodwillMember_C00A5407071A3F389F241E8CBD3D3F30" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CapitalisedDevelopmentExpenditureMember" xlink:label="loc_ifrs-full_CapitalisedDevelopmentExpenditureMember_854C99036BA5D641A31F1E8CBD3ED5BC" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_98EE8DD1271329050AC81E8CBD3D4198" xlink:to="loc_ifrs-full_CapitalisedDevelopmentExpenditureMember_854C99036BA5D641A31F1E8CBD3ED5BC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CustomerrelatedIntangibleAssetsMember" xlink:label="loc_ifrs-full_CustomerrelatedIntangibleAssetsMember_713E7B0DAE1BB92638931E8CBD3EBACE" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_98EE8DD1271329050AC81E8CBD3D4198" xlink:to="loc_ifrs-full_CustomerrelatedIntangibleAssetsMember_713E7B0DAE1BB92638931E8CBD3EBACE" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ERPandOtherSoftwareMember" xlink:label="loc_cae_ERPandOtherSoftwareMember_8C513BF2760A02BE88C71E8CBD3EDC0B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_98EE8DD1271329050AC81E8CBD3D4198" xlink:to="loc_cae_ERPandOtherSoftwareMember_8C513BF2760A02BE88C71E8CBD3EDC0B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TechnologybasedIntangibleAssetsMember" xlink:label="loc_ifrs-full_TechnologybasedIntangibleAssetsMember_DA78CAC7FBBC96B18D751E8CBD3E7BEC" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_98EE8DD1271329050AC81E8CBD3D4198" xlink:to="loc_ifrs-full_TechnologybasedIntangibleAssetsMember_DA78CAC7FBBC96B18D751E8CBD3E7BEC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherIntangibleAssetsMember" xlink:label="loc_ifrs-full_OtherIntangibleAssetsMember_C8F10E86B65C7644E89C1E8CBD3F361A" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_98EE8DD1271329050AC81E8CBD3D4198" xlink:to="loc_ifrs-full_OtherIntangibleAssetsMember_C8F10E86B65C7644E89C1E8CBD3F361A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_AC48C75966D0436252071E8CBD3F447B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable_2933188DD48695ED1D301E8CBD3C7E7A" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_AC48C75966D0436252071E8CBD3F447B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CarryingAmountMember" xlink:label="loc_ifrs-full_CarryingAmountMember_629E579EEB913785C8861E8CBD3FE52B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_AC48C75966D0436252071E8CBD3F447B" xlink:to="loc_ifrs-full_CarryingAmountMember_629E579EEB913785C8861E8CBD3FE52B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CarryingAmountMember" xlink:label="loc_ifrs-full_CarryingAmountMember_629E579EEB913785C8861E8CBD3FE52B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_AC48C75966D0436252071E8CBD3F447B" xlink:to="loc_ifrs-full_CarryingAmountMember_629E579EEB913785C8861E8CBD3FE52B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GrossCarryingAmountMember" xlink:label="loc_ifrs-full_GrossCarryingAmountMember_AE397B93DB4E21E8D6A51E8CBD3F6BCF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_629E579EEB913785C8861E8CBD3FE52B" xlink:to="loc_ifrs-full_GrossCarryingAmountMember_AE397B93DB4E21E8D6A51E8CBD3F6BCF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AccumulatedDepreciationAndAmortisationMember" xlink:label="loc_ifrs-full_AccumulatedDepreciationAndAmortisationMember_A5CB61081899EFAF5EB61E8CBD3F8EDD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_629E579EEB913785C8861E8CBD3FE52B" xlink:to="loc_ifrs-full_AccumulatedDepreciationAndAmortisationMember_A5CB61081899EFAF5EB61E8CBD3F8EDD" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_IncomeStatementLocation1Axis" xlink:label="loc_cae_IncomeStatementLocation1Axis_9F365B67DFA1DB118A2F1E8CBD404E3C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillTable_2933188DD48695ED1D301E8CBD3C7E7A" xlink:to="loc_cae_IncomeStatementLocation1Axis_9F365B67DFA1DB118A2F1E8CBD404E3C" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_IncomeStatementLocation1Domain" xlink:label="loc_cae_IncomeStatementLocation1Domain_657A5569C2AC95570B7B1E8CBD4034C0_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_IncomeStatementLocation1Axis_9F365B67DFA1DB118A2F1E8CBD404E3C" xlink:to="loc_cae_IncomeStatementLocation1Domain_657A5569C2AC95570B7B1E8CBD4034C0_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_IncomeStatementLocation1Domain" xlink:label="loc_cae_IncomeStatementLocation1Domain_657A5569C2AC95570B7B1E8CBD4034C0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_IncomeStatementLocation1Axis_9F365B67DFA1DB118A2F1E8CBD404E3C" xlink:to="loc_cae_IncomeStatementLocation1Domain_657A5569C2AC95570B7B1E8CBD4034C0" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CostOfRevenueMember" xlink:label="loc_cae_CostOfRevenueMember_1868D19595FDC56A49851E8CBD402EDB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_IncomeStatementLocation1Domain_657A5569C2AC95570B7B1E8CBD4034C0" xlink:to="loc_cae_CostOfRevenueMember_1868D19595FDC56A49851E8CBD402EDB" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ResearchAndDevelopmentExpensesMember" xlink:label="loc_cae_ResearchAndDevelopmentExpensesMember_F92CA67EB4FA3051FC411E8CBD41A737" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_IncomeStatementLocation1Domain_657A5569C2AC95570B7B1E8CBD4034C0" xlink:to="loc_cae_ResearchAndDevelopmentExpensesMember_F92CA67EB4FA3051FC411E8CBD41A737" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SellingGeneralAndAdministrativeExpenses1Member" xlink:label="loc_cae_SellingGeneralAndAdministrativeExpenses1Member_3076C78360A72BBFC9571E8CBD41CDF4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_IncomeStatementLocation1Domain_657A5569C2AC95570B7B1E8CBD4034C0" xlink:to="loc_cae_SellingGeneralAndAdministrativeExpenses1Member_3076C78360A72BBFC9571E8CBD41CDF4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract" xlink:label="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract_AF68BAA19881687F17A61E8CBD410114" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems_CA12DE7480D66EEEDBF71E8CBD415960" xlink:to="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract_AF68BAA19881687F17A61E8CBD410114" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsAndGoodwill" xlink:label="loc_ifrs-full_IntangibleAssetsAndGoodwill_7D34408F80120D914D491E8CBD411088" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract_AF68BAA19881687F17A61E8CBD410114" xlink:to="loc_ifrs-full_IntangibleAssetsAndGoodwill_7D34408F80120D914D491E8CBD411088" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill" xlink:label="loc_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill_372E9EF687BFCB4C8EC71E8CBD4253B7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract_AF68BAA19881687F17A61E8CBD410114" xlink:to="loc_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill_372E9EF687BFCB4C8EC71E8CBD4253B7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsAndGoodwill" xlink:label="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsAndGoodwill_9334F284197795B950D91E8CBD422A01" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract_AF68BAA19881687F17A61E8CBD410114" xlink:to="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsAndGoodwill_9334F284197795B950D91E8CBD422A01" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DisposalAndRemeasurementOfInterestInInvestment" xlink:label="loc_cae_DisposalAndRemeasurementOfInterestInInvestment_EBF12604AA4BF25B82D61E8CBD429610" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract_AF68BAA19881687F17A61E8CBD410114" xlink:to="loc_cae_DisposalAndRemeasurementOfInterestInInvestment_EBF12604AA4BF25B82D61E8CBD429610" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill" xlink:label="loc_ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill_9B1DC6AB1BBCAFBA828B1E8CBD42D738" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract_AF68BAA19881687F17A61E8CBD410114" xlink:to="loc_ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill_9B1DC6AB1BBCAFBA828B1E8CBD42D738" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesIntangibleAssetsAndGoodwill" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesIntangibleAssetsAndGoodwill_BFA4614BD7AD2540766D1E8CBD423092" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract_AF68BAA19881687F17A61E8CBD410114" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesIntangibleAssetsAndGoodwill_BFA4614BD7AD2540766D1E8CBD423092" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsAndGoodwill" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsAndGoodwill_00FB547B492CBF78A45D1E8CBD436C4C" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsAndGoodwillAbstract_AF68BAA19881687F17A61E8CBD410114" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsAndGoodwill_00FB547B492CBF78A45D1E8CBD436C4C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AmortisationExpense" xlink:label="loc_ifrs-full_AmortisationExpense_B257AED7CE5BCB700DB01E8CBD43444A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems_CA12DE7480D66EEEDBF71E8CBD415960" xlink:to="loc_ifrs-full_AmortisationExpense_B257AED7CE5BCB700DB01E8CBD43444A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_RemainingUsefulLivesOrAmortisationRatesIntangibleAssetsOtherThanGoodwillPeriod" xlink:label="loc_cae_RemainingUsefulLivesOrAmortisationRatesIntangibleAssetsOtherThanGoodwillPeriod_F3DBBD39E46B9E5503CE1E8CBD43E065" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems_CA12DE7480D66EEEDBF71E8CBD415960" xlink:to="loc_cae_RemainingUsefulLivesOrAmortisationRatesIntangibleAssetsOtherThanGoodwillPeriod_F3DBBD39E46B9E5503CE1E8CBD43E065" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberOfIntangibleAssetsWithIndefiniteUsefulLifeOtherThanGoodwill" xlink:label="loc_cae_NumberOfIntangibleAssetsWithIndefiniteUsefulLifeOtherThanGoodwill_6618AFAA3EDC01841F171E8CBD439F23" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems_CA12DE7480D66EEEDBF71E8CBD415960" xlink:to="loc_cae_NumberOfIntangibleAssetsWithIndefiniteUsefulLifeOtherThanGoodwill_6618AFAA3EDC01841F171E8CBD439F23" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/IntangibleAssetsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/Inventories" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/InventoriesCostOfSalesDetails" xlink:type="extended">
    <link:loc xlink:href="cae-20180331.xsd#cae_ScheduleofInventoryLineItems" xlink:label="loc_cae_ScheduleofInventoryLineItems_6B95766F0CB44153C7CBB6B87D360415" xlink:type="locator" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ScheduleofInventoryTable" xlink:label="loc_cae_ScheduleofInventoryTable_DF56BD451EA47F755321B6B87D310FA1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cae_ScheduleofInventoryLineItems_6B95766F0CB44153C7CBB6B87D360415" xlink:to="loc_cae_ScheduleofInventoryTable_DF56BD451EA47F755321B6B87D310FA1" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TypesofInventoryAxis" xlink:label="loc_cae_TypesofInventoryAxis_D1290D84C0E74DB27876B6B87D31EDF9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cae_ScheduleofInventoryTable_DF56BD451EA47F755321B6B87D310FA1" xlink:to="loc_cae_TypesofInventoryAxis_D1290D84C0E74DB27876B6B87D31EDF9" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TypesofInventoryDomain" xlink:label="loc_cae_TypesofInventoryDomain_0B7822AE1FD337CFCDABB6B87D3184E5_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_TypesofInventoryAxis_D1290D84C0E74DB27876B6B87D31EDF9" xlink:to="loc_cae_TypesofInventoryDomain_0B7822AE1FD337CFCDABB6B87D3184E5_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TypesofInventoryDomain" xlink:label="loc_cae_TypesofInventoryDomain_0B7822AE1FD337CFCDABB6B87D3184E5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_TypesofInventoryAxis_D1290D84C0E74DB27876B6B87D31EDF9" xlink:to="loc_cae_TypesofInventoryDomain_0B7822AE1FD337CFCDABB6B87D3184E5" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_WorkInProgressMember" xlink:label="loc_cae_WorkInProgressMember_3133B07069B9C912E24FB6B87D31EFF5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_TypesofInventoryDomain_0B7822AE1FD337CFCDABB6B87D3184E5" xlink:to="loc_cae_WorkInProgressMember_3133B07069B9C912E24FB6B87D31EFF5" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_RawMaterialsSuppliesAndManufacturedProductsMember" xlink:label="loc_cae_RawMaterialsSuppliesAndManufacturedProductsMember_061D2E3522EF9FE00CF7B6B87D314C0D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_TypesofInventoryDomain_0B7822AE1FD337CFCDABB6B87D3184E5" xlink:to="loc_cae_RawMaterialsSuppliesAndManufacturedProductsMember_061D2E3522EF9FE00CF7B6B87D314C0D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CostOfInventoriesRecognisedAsExpenseDuringPeriod" xlink:label="loc_ifrs-full_CostOfInventoriesRecognisedAsExpenseDuringPeriod_DF0B438CF0ABB216FBABB6B87D37AD1E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_ScheduleofInventoryLineItems_6B95766F0CB44153C7CBB6B87D360415" xlink:to="loc_ifrs-full_CostOfInventoriesRecognisedAsExpenseDuringPeriod_DF0B438CF0ABB216FBABB6B87D37AD1E" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/InventoriesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/InventoriesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/NatureOfOperationsAndSummaryOfSignificantAccountingPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/NatureOfOperationsAndSummaryOfSignificantAccountingPoliciesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_AF3D5D5EDA4A428B49121E8CBDD90758" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_D498E4AEEABBCDF95EFB1E8CBDCD1604" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_AF3D5D5EDA4A428B49121E8CBDD90758" xlink:to="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_D498E4AEEABBCDF95EFB1E8CBDCD1604" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:label="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_E08396DA61B32B8A17871E8CBDCEA6D1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_D498E4AEEABBCDF95EFB1E8CBDCD1604" xlink:to="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_E08396DA61B32B8A17871E8CBDCEA6D1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PropertyPlantAndEquipmentMember" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentMember_1F69C79408966C080BC71E8CBDCE1F56_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_E08396DA61B32B8A17871E8CBDCEA6D1" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentMember_1F69C79408966C080BC71E8CBDCE1F56_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PropertyPlantAndEquipmentMember" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentMember_1F69C79408966C080BC71E8CBDCE1F56" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_E08396DA61B32B8A17871E8CBDCEA6D1" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentMember_1F69C79408966C080BC71E8CBDCE1F56" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BuildingsMember" xlink:label="loc_ifrs-full_BuildingsMember_8B3ACA79631FDCB5E2601E8CBDCEE15B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_1F69C79408966C080BC71E8CBDCE1F56" xlink:to="loc_ifrs-full_BuildingsMember_8B3ACA79631FDCB5E2601E8CBDCEE15B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SimulatorsMember" xlink:label="loc_cae_SimulatorsMember_B9736918134A628D22611E8CBDCF8EE5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_1F69C79408966C080BC71E8CBDCE1F56" xlink:to="loc_cae_SimulatorsMember_B9736918134A628D22611E8CBDCF8EE5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MachineryMember" xlink:label="loc_ifrs-full_MachineryMember_B8D9683119499CDC50251E8CBDCFF273" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_1F69C79408966C080BC71E8CBDCE1F56" xlink:to="loc_ifrs-full_MachineryMember_B8D9683119499CDC50251E8CBDCFF273" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AircraftMember" xlink:label="loc_ifrs-full_AircraftMember_DC334079F0702E8AC00C1E8CBDCFBC0A" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_1F69C79408966C080BC71E8CBDCE1F56" xlink:to="loc_ifrs-full_AircraftMember_DC334079F0702E8AC00C1E8CBDCFBC0A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AircraftEnginesMember" xlink:label="loc_cae_AircraftEnginesMember_F1D0C5115FF065FF38011E8CBDCFF92B" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_1F69C79408966C080BC71E8CBDCE1F56" xlink:to="loc_cae_AircraftEnginesMember_F1D0C5115FF065FF38011E8CBDCFF92B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis" xlink:label="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_F55696F96F0562171BF11E8CBDCF973F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_D498E4AEEABBCDF95EFB1E8CBDCD1604" xlink:to="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_F55696F96F0562171BF11E8CBDCF973F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwillMember" xlink:label="loc_ifrs-full_IntangibleAssetsOtherThanGoodwillMember_93736A7421318F5063C81E8CBDD0E3C1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_F55696F96F0562171BF11E8CBDCF973F" xlink:to="loc_ifrs-full_IntangibleAssetsOtherThanGoodwillMember_93736A7421318F5063C81E8CBDD0E3C1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwillMember" xlink:label="loc_ifrs-full_IntangibleAssetsOtherThanGoodwillMember_93736A7421318F5063C81E8CBDD0E3C1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis_F55696F96F0562171BF11E8CBDCF973F" xlink:to="loc_ifrs-full_IntangibleAssetsOtherThanGoodwillMember_93736A7421318F5063C81E8CBDD0E3C1" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CapitalizeddevelopmentcostsMember" xlink:label="loc_cae_CapitalizeddevelopmentcostsMember_D1B16011468DE72898CB1E8CBDD0BC8A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IntangibleAssetsOtherThanGoodwillMember_93736A7421318F5063C81E8CBDD0E3C1" xlink:to="loc_cae_CapitalizeddevelopmentcostsMember_D1B16011468DE72898CB1E8CBDD0BC8A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CustomerrelatedIntangibleAssetsMember" xlink:label="loc_ifrs-full_CustomerrelatedIntangibleAssetsMember_FBC88477CE72BB05926B1E8CBDD0C68C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IntangibleAssetsOtherThanGoodwillMember_93736A7421318F5063C81E8CBDD0E3C1" xlink:to="loc_ifrs-full_CustomerrelatedIntangibleAssetsMember_FBC88477CE72BB05926B1E8CBDD0C68C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ComputerSoftwareMember" xlink:label="loc_ifrs-full_ComputerSoftwareMember_FDE060925BBE60351E5D1E8CBDD1AC91" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IntangibleAssetsOtherThanGoodwillMember_93736A7421318F5063C81E8CBDD0E3C1" xlink:to="loc_ifrs-full_ComputerSoftwareMember_FDE060925BBE60351E5D1E8CBDD1AC91" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TechnologybasedIntangibleAssetsMember" xlink:label="loc_ifrs-full_TechnologybasedIntangibleAssetsMember_0CA56F3B3273A448106E1E8CBDD1E3CC" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IntangibleAssetsOtherThanGoodwillMember_93736A7421318F5063C81E8CBDD0E3C1" xlink:to="loc_ifrs-full_TechnologybasedIntangibleAssetsMember_0CA56F3B3273A448106E1E8CBDD1E3CC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherIntangibleAssetsMember" xlink:label="loc_ifrs-full_OtherIntangibleAssetsMember_B84681EB63064186D40B1E8CBDD104C5" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IntangibleAssetsOtherThanGoodwillMember_93736A7421318F5063C81E8CBDD0E3C1" xlink:to="loc_ifrs-full_OtherIntangibleAssetsMember_B84681EB63064186D40B1E8CBDD104C5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfFinancialInstrumentsAxis" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_168F0B35A8EA69C63BB11E8CBDD2B52E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_D498E4AEEABBCDF95EFB1E8CBDCD1604" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_168F0B35A8EA69C63BB11E8CBDD2B52E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfFinancialInstrumentsMember" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_FE62C0F67EA5EE226EB51E8CBDD7121F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_168F0B35A8EA69C63BB11E8CBDD2B52E" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_FE62C0F67EA5EE226EB51E8CBDD7121F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfFinancialInstrumentsMember" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_FE62C0F67EA5EE226EB51E8CBDD7121F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_168F0B35A8EA69C63BB11E8CBDD2B52E" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_FE62C0F67EA5EE226EB51E8CBDD7121F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_GovernmentRoyaltiesMember" xlink:label="loc_cae_GovernmentRoyaltiesMember_E93D457A568D72A211091E8CBDD7F5C5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsMember_FE62C0F67EA5EE226EB51E8CBDD7121F" xlink:to="loc_cae_GovernmentRoyaltiesMember_E93D457A568D72A211091E8CBDD7F5C5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangeAxis" xlink:label="loc_ifrs-full_RangeAxis_D50EA9248826032920EE1E8CBDD8AAC7" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_D498E4AEEABBCDF95EFB1E8CBDCD1604" xlink:to="loc_ifrs-full_RangeAxis_D50EA9248826032920EE1E8CBDD8AAC7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="loc_ifrs-full_RangesMember_B80C8CC7475F7930C9701E8CBDD8E3F2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_D50EA9248826032920EE1E8CBDD8AAC7" xlink:to="loc_ifrs-full_RangesMember_B80C8CC7475F7930C9701E8CBDD8E3F2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="loc_ifrs-full_RangesMember_B80C8CC7475F7930C9701E8CBDD8E3F2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_D50EA9248826032920EE1E8CBDD8AAC7" xlink:to="loc_ifrs-full_RangesMember_B80C8CC7475F7930C9701E8CBDD8E3F2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BottomOfRangeMember" xlink:label="loc_ifrs-full_BottomOfRangeMember_A51B19DA04F5731DE3071E8CBDD86E77" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesMember_B80C8CC7475F7930C9701E8CBDD8E3F2" xlink:to="loc_ifrs-full_BottomOfRangeMember_A51B19DA04F5731DE3071E8CBDD86E77" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TopOfRangeMember" xlink:label="loc_ifrs-full_TopOfRangeMember_EFEFCE82FAEAA940A3DE1E8CBDD998C5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesMember_B80C8CC7475F7930C9701E8CBDD8E3F2" xlink:to="loc_ifrs-full_TopOfRangeMember_EFEFCE82FAEAA940A3DE1E8CBDD998C5" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberOfOperatingSegments1" xlink:label="loc_cae_NumberOfOperatingSegments1_6E7CE1BCA4F8698CD8511E8CBDD9619B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_AF3D5D5EDA4A428B49121E8CBDD90758" xlink:to="loc_cae_NumberOfOperatingSegments1_6E7CE1BCA4F8698CD8511E8CBDD9619B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DepreciationMethodPropertyPlantAndEquipment" xlink:label="loc_ifrs-full_DepreciationMethodPropertyPlantAndEquipment_EC0D221C37DBDBAA4C161E8CBDD97251" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_AF3D5D5EDA4A428B49121E8CBDD90758" xlink:to="loc_ifrs-full_DepreciationMethodPropertyPlantAndEquipment_EC0D221C37DBDBAA4C161E8CBDD97251" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DepreciationRatesPropertyPlantAndEquipment" xlink:label="loc_cae_DepreciationRatesPropertyPlantAndEquipment_C1B0F4D5B200EE296F4E1E8CBDD9CB38" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_AF3D5D5EDA4A428B49121E8CBDD90758" xlink:to="loc_cae_DepreciationRatesPropertyPlantAndEquipment_C1B0F4D5B200EE296F4E1E8CBDD9CB38" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_UsefulLivesPropertyPlantAndEquipment" xlink:label="loc_cae_UsefulLivesPropertyPlantAndEquipment_873F4DE5C0687FCD64291E8CBDDAAC42" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_AF3D5D5EDA4A428B49121E8CBDD90758" xlink:to="loc_cae_UsefulLivesPropertyPlantAndEquipment_873F4DE5C0687FCD64291E8CBDDAAC42" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_UtilizationRatePropertyPlantAndEquipment" xlink:label="loc_cae_UtilizationRatePropertyPlantAndEquipment_8CBD174D0B628E362FAF1E8CBDDADB47" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_AF3D5D5EDA4A428B49121E8CBDD90758" xlink:to="loc_cae_UtilizationRatePropertyPlantAndEquipment_8CBD174D0B628E362FAF1E8CBDDADB47" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AmortisationMethodIntangibleAssetsOtherThanGoodwill" xlink:label="loc_ifrs-full_AmortisationMethodIntangibleAssetsOtherThanGoodwill_C8AA4F836C8E58749D031E8CBDDA9404" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_AF3D5D5EDA4A428B49121E8CBDD90758" xlink:to="loc_ifrs-full_AmortisationMethodIntangibleAssetsOtherThanGoodwill_C8AA4F836C8E58749D031E8CBDDA9404" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_UsefulLivesIntangibleAssetsOtherThanGoodwill" xlink:label="loc_cae_UsefulLivesIntangibleAssetsOtherThanGoodwill_423F289170788AD7AD9C1E8CBDDA90A8" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_AF3D5D5EDA4A428B49121E8CBDD90758" xlink:to="loc_cae_UsefulLivesIntangibleAssetsOtherThanGoodwill_423F289170788AD7AD9C1E8CBDDA90A8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections" xlink:label="loc_ifrs-full_DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections_06A08BB4DCC96EE9C3CA1E8CBDDAFFD2" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_AF3D5D5EDA4A428B49121E8CBDD90758" xlink:to="loc_ifrs-full_DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections_06A08BB4DCC96EE9C3CA1E8CBDDAFFD2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DescriptionOfDiscountRatesUsedInCurrentEstimateOfValueInUse" xlink:label="loc_ifrs-full_DescriptionOfDiscountRatesUsedInCurrentEstimateOfValueInUse_460FD332F9A2A7056DA11E8CBDDA8E6B" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_AF3D5D5EDA4A428B49121E8CBDD90758" xlink:to="loc_ifrs-full_DescriptionOfDiscountRatesUsedInCurrentEstimateOfValueInUse_460FD332F9A2A7056DA11E8CBDDA8E6B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_IncreaseDecreaseInRoyaltyObligationImpactOfOnePercentChangeInGrowthRate" xlink:label="loc_cae_IncreaseDecreaseInRoyaltyObligationImpactOfOnePercentChangeInGrowthRate_8FD51C4373874CC1D2441E8CBDDB3405" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_AF3D5D5EDA4A428B49121E8CBDD90758" xlink:to="loc_cae_IncreaseDecreaseInRoyaltyObligationImpactOfOnePercentChangeInGrowthRate_8FD51C4373874CC1D2441E8CBDDB3405" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MinimumFinanceLeasePaymentsPayable" xlink:label="loc_ifrs-full_MinimumFinanceLeasePaymentsPayable_47D0876A22D811DBA17A1E8CBDDB57EE" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_AF3D5D5EDA4A428B49121E8CBDD90758" xlink:to="loc_ifrs-full_MinimumFinanceLeasePaymentsPayable_47D0876A22D811DBA17A1E8CBDDB57EE" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/NatureOfOperationsAndSummaryOfSignificantAccountingPoliciesPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/NatureOfOperationsAndSummaryOfSignificantAccountingPoliciesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/OperatingSegmentsAndGeographicInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/OperatingSegmentsAndGeographicInformationAssetsAndLiabilitiesEmployedBySegmentDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_ACD826C0D447A00096194ED9490BBB4D" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_4543F6B03EC9734DEBB34ED9490A7AF6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_ACD826C0D447A00096194ED9490BBB4D" xlink:to="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_4543F6B03EC9734DEBB34ED9490A7AF6" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentConsolidationItemsAxis" xlink:label="loc_ifrs-full_SegmentConsolidationItemsAxis_F8607334DC7CB9B6444F4ED9490A735F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_4543F6B03EC9734DEBB34ED9490A7AF6" xlink:to="loc_ifrs-full_SegmentConsolidationItemsAxis_F8607334DC7CB9B6444F4ED9490A735F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:label="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_6610418EBAFF360BC98D4ED9490B936C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentConsolidationItemsAxis_F8607334DC7CB9B6444F4ED9490A735F" xlink:to="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_6610418EBAFF360BC98D4ED9490B936C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:label="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_6610418EBAFF360BC98D4ED9490B936C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentConsolidationItemsAxis_F8607334DC7CB9B6444F4ED9490A735F" xlink:to="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_6610418EBAFF360BC98D4ED9490B936C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OperatingSegmentsMember" xlink:label="loc_ifrs-full_OperatingSegmentsMember_CDEF52ABDD979C6D2C5E4EE3FCC06F1B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_6610418EBAFF360BC98D4ED9490B936C" xlink:to="loc_ifrs-full_OperatingSegmentsMember_CDEF52ABDD979C6D2C5E4EE3FCC06F1B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_UnallocatedAmountsMember" xlink:label="loc_ifrs-full_UnallocatedAmountsMember_791681B4620CCFB143C24EE3FCD58F7C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_6610418EBAFF360BC98D4ED9490B936C" xlink:to="loc_ifrs-full_UnallocatedAmountsMember_791681B4620CCFB143C24EE3FCD58F7C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentsAxis" xlink:label="loc_ifrs-full_SegmentsAxis_A64A58E9588118C763844ED9490B823A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_4543F6B03EC9734DEBB34ED9490A7AF6" xlink:to="loc_ifrs-full_SegmentsAxis_A64A58E9588118C763844ED9490B823A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentsMember" xlink:label="loc_ifrs-full_SegmentsMember_76A77E7FA866BC11D2054ED9490BCB98_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentsAxis_A64A58E9588118C763844ED9490B823A" xlink:to="loc_ifrs-full_SegmentsMember_76A77E7FA866BC11D2054ED9490BCB98_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentsMember" xlink:label="loc_ifrs-full_SegmentsMember_76A77E7FA866BC11D2054ED9490BCB98" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentsAxis_A64A58E9588118C763844ED9490B823A" xlink:to="loc_ifrs-full_SegmentsMember_76A77E7FA866BC11D2054ED9490BCB98" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CivilAviationTrainingSolutionsMember" xlink:label="loc_cae_CivilAviationTrainingSolutionsMember_A2D5FA5A72EA12B585384ED9490BCF05" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsMember_76A77E7FA866BC11D2054ED9490BCB98" xlink:to="loc_cae_CivilAviationTrainingSolutionsMember_A2D5FA5A72EA12B585384ED9490BCF05" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DefenseandSecurityMember" xlink:label="loc_cae_DefenseandSecurityMember_3C2AA2CC4004C62F62234ED9490BB45E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsMember_76A77E7FA866BC11D2054ED9490BCB98" xlink:to="loc_cae_DefenseandSecurityMember_3C2AA2CC4004C62F62234ED9490BB45E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_HealthcareMember" xlink:label="loc_cae_HealthcareMember_ED06A538C3F46FB1C1604ED9490B3932" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsMember_76A77E7FA866BC11D2054ED9490BCB98" xlink:to="loc_cae_HealthcareMember_ED06A538C3F46FB1C1604ED9490B3932" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Assets" xlink:label="loc_ifrs-full_Assets_0438FA01DACF31D48C8B4ED9490B106E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_ACD826C0D447A00096194ED9490BBB4D" xlink:to="loc_ifrs-full_Assets_0438FA01DACF31D48C8B4ED9490B106E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Liabilities" xlink:label="loc_ifrs-full_Liabilities_21AED7D13BB36C5D484F4ED9490BAEAD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_ACD826C0D447A00096194ED9490BBB4D" xlink:to="loc_ifrs-full_Liabilities_21AED7D13BB36C5D484F4ED9490BAEAD" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/OperatingSegmentsAndGeographicInformationCapitalExpendituresDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_7F665CF91B8E015369BBDAB90E831330" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_29A9DD4EECE3E786C649DAB90E7B9D47" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_7F665CF91B8E015369BBDAB90E831330" xlink:to="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_29A9DD4EECE3E786C649DAB90E7B9D47" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentConsolidationItemsAxis" xlink:label="loc_ifrs-full_SegmentConsolidationItemsAxis_4BC14684EE6951A80884DB168D7EB567" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_29A9DD4EECE3E786C649DAB90E7B9D47" xlink:to="loc_ifrs-full_SegmentConsolidationItemsAxis_4BC14684EE6951A80884DB168D7EB567" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:label="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_76A9732AB056CADC05CFDB168D81160D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentConsolidationItemsAxis_4BC14684EE6951A80884DB168D7EB567" xlink:to="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_76A9732AB056CADC05CFDB168D81160D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:label="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_76A9732AB056CADC05CFDB168D81160D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentConsolidationItemsAxis_4BC14684EE6951A80884DB168D7EB567" xlink:to="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_76A9732AB056CADC05CFDB168D81160D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OperatingSegmentsMember" xlink:label="loc_ifrs-full_OperatingSegmentsMember_4927624F766392D465A3DB168EAE0DA1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_76A9732AB056CADC05CFDB168D81160D" xlink:to="loc_ifrs-full_OperatingSegmentsMember_4927624F766392D465A3DB168EAE0DA1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentsAxis" xlink:label="loc_ifrs-full_SegmentsAxis_364C18FF4063A65AE463DAB90E7C8120" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_29A9DD4EECE3E786C649DAB90E7B9D47" xlink:to="loc_ifrs-full_SegmentsAxis_364C18FF4063A65AE463DAB90E7C8120" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentsMember" xlink:label="loc_ifrs-full_SegmentsMember_7F019CF91A2B7EFDBBD6DAB90E8114C5_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentsAxis_364C18FF4063A65AE463DAB90E7C8120" xlink:to="loc_ifrs-full_SegmentsMember_7F019CF91A2B7EFDBBD6DAB90E8114C5_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentsMember" xlink:label="loc_ifrs-full_SegmentsMember_7F019CF91A2B7EFDBBD6DAB90E8114C5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentsAxis_364C18FF4063A65AE463DAB90E7C8120" xlink:to="loc_ifrs-full_SegmentsMember_7F019CF91A2B7EFDBBD6DAB90E8114C5" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CivilAviationTrainingSolutionsMember" xlink:label="loc_cae_CivilAviationTrainingSolutionsMember_6D868F70934722BDADA5DAB90E827F44" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsMember_7F019CF91A2B7EFDBBD6DAB90E8114C5" xlink:to="loc_cae_CivilAviationTrainingSolutionsMember_6D868F70934722BDADA5DAB90E827F44" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DefenseandSecurityMember" xlink:label="loc_cae_DefenseandSecurityMember_4304CA5853A0C963CBB1DAB90E823415" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsMember_7F019CF91A2B7EFDBBD6DAB90E8114C5" xlink:to="loc_cae_DefenseandSecurityMember_4304CA5853A0C963CBB1DAB90E823415" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_HealthcareMember" xlink:label="loc_cae_HealthcareMember_2FFB2B630A6F31E91547DAB90E83B709" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsMember_7F019CF91A2B7EFDBBD6DAB90E8114C5" xlink:to="loc_cae_HealthcareMember_2FFB2B630A6F31E91547DAB90E83B709" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PaymentstoAcquireProductiveAssets" xlink:label="loc_cae_PaymentstoAcquireProductiveAssets_7CCF6CCDF2069A5D4F73DAB90E83E014" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_7F665CF91B8E015369BBDAB90E831330" xlink:to="loc_cae_PaymentstoAcquireProductiveAssets_7CCF6CCDF2069A5D4F73DAB90E83E014" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/OperatingSegmentsAndGeographicInformationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/OperatingSegmentsAndGeographicInformationGeographicInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_51EEDDC00EE16F62F1199C9D29533CBD" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_5156735790CB66BDB8769C9D295195C1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_51EEDDC00EE16F62F1199C9D29533CBD" xlink:to="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_5156735790CB66BDB8769C9D295195C1" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GeographicalAreasAxis" xlink:label="loc_ifrs-full_GeographicalAreasAxis_FECDFBF1514D4B31B9519C9D29514803" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_5156735790CB66BDB8769C9D295195C1" xlink:to="loc_ifrs-full_GeographicalAreasAxis_FECDFBF1514D4B31B9519C9D29514803" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GeographicalAreasMember" xlink:label="loc_ifrs-full_GeographicalAreasMember_84A5C6EC5A9AC30D69539C9D29519E7E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_GeographicalAreasAxis_FECDFBF1514D4B31B9519C9D29514803" xlink:to="loc_ifrs-full_GeographicalAreasMember_84A5C6EC5A9AC30D69539C9D29519E7E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GeographicalAreasMember" xlink:label="loc_ifrs-full_GeographicalAreasMember_84A5C6EC5A9AC30D69539C9D29519E7E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_GeographicalAreasAxis_FECDFBF1514D4B31B9519C9D29514803" xlink:to="loc_ifrs-full_GeographicalAreasMember_84A5C6EC5A9AC30D69539C9D29519E7E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_CA" xlink:label="loc_country_CA_241D3EFD59A8935331B59C9D2952CDD0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_84A5C6EC5A9AC30D69539C9D29519E7E" xlink:to="loc_country_CA_241D3EFD59A8935331B59C9D2952CDD0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_US" xlink:label="loc_country_US_A7CE4F11606BD1743A489C9D29520E63" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_84A5C6EC5A9AC30D69539C9D29519E7E" xlink:to="loc_country_US_A7CE4F11606BD1743A489C9D29520E63" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_BR" xlink:label="loc_country_BR_2481EF133800BB09EFAF9C9D29521C86" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_84A5C6EC5A9AC30D69539C9D29519E7E" xlink:to="loc_country_BR_2481EF133800BB09EFAF9C9D29521C86" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_GB" xlink:label="loc_country_GB_37CB61B01027EDDD058E9C9D29521890" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_84A5C6EC5A9AC30D69539C9D29519E7E" xlink:to="loc_country_GB_37CB61B01027EDDD058E9C9D29521890" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_DE" xlink:label="loc_country_DE_111B9D44FD56906906909C9D295240E2" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_84A5C6EC5A9AC30D69539C9D29519E7E" xlink:to="loc_country_DE_111B9D44FD56906906909C9D295240E2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_LU" xlink:label="loc_country_LU_80E867CEC02E2BE79CF79C9D2952B5DA" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_84A5C6EC5A9AC30D69539C9D29519E7E" xlink:to="loc_country_LU_80E867CEC02E2BE79CF79C9D2952B5DA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_NL" xlink:label="loc_country_NL_9307134796837D0ACEFD9C9D29526AEA" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_84A5C6EC5A9AC30D69539C9D29519E7E" xlink:to="loc_country_NL_9307134796837D0ACEFD9C9D29526AEA" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_OtherEuropeanCountriesMember" xlink:label="loc_cae_OtherEuropeanCountriesMember_8BE0D3626B516BB2811B9C9D2952CF1D" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_84A5C6EC5A9AC30D69539C9D29519E7E" xlink:to="loc_cae_OtherEuropeanCountriesMember_8BE0D3626B516BB2811B9C9D2952CF1D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_MY" xlink:label="loc_country_MY_022CA52FCF42AC88D3079C9D6530F9A7" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_84A5C6EC5A9AC30D69539C9D29519E7E" xlink:to="loc_country_MY_022CA52FCF42AC88D3079C9D6530F9A7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_AE" xlink:label="loc_country_AE_9213147914EEC087DECF9C9D2952414E" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_84A5C6EC5A9AC30D69539C9D29519E7E" xlink:to="loc_country_AE_9213147914EEC087DECF9C9D2952414E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_CN" xlink:label="loc_country_CN_027EC4D4F24A9555B73C9C9D295290E1" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_84A5C6EC5A9AC30D69539C9D29519E7E" xlink:to="loc_country_CN_027EC4D4F24A9555B73C9C9D295290E1" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_OtherAsianCountriesMember" xlink:label="loc_cae_OtherAsianCountriesMember_19D5F0EB568D428B5DE59C9D29538B8B" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_84A5C6EC5A9AC30D69539C9D29519E7E" xlink:to="loc_cae_OtherAsianCountriesMember_19D5F0EB568D428B5DE59C9D29538B8B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd#country_AU" xlink:label="loc_country_AU_35494A0AD8F76C701DC79C9D2953EB3D" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_84A5C6EC5A9AC30D69539C9D29519E7E" xlink:to="loc_country_AU_35494A0AD8F76C701DC79C9D2953EB3D" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_OtherCountriesMember" xlink:label="loc_cae_OtherCountriesMember_E3B9ECE70DA3407E46DB9C9D2953586F" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasMember_84A5C6EC5A9AC30D69539C9D29519E7E" xlink:to="loc_cae_OtherCountriesMember_E3B9ECE70DA3407E46DB9C9D2953586F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Revenue" xlink:label="loc_ifrs-full_Revenue_1AF343EC8C7774D3D98D9C9D29538837" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_51EEDDC00EE16F62F1199C9D29533CBD" xlink:to="loc_ifrs-full_Revenue_1AF343EC8C7774D3D98D9C9D29538837" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NoncurrentAssetsOtherThanFinancialInstrumentsandDeferredTaxAssets" xlink:label="loc_cae_NoncurrentAssetsOtherThanFinancialInstrumentsandDeferredTaxAssets_F91B3DE2023B853F50F79C9D2953C40A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_51EEDDC00EE16F62F1199C9D29533CBD" xlink:to="loc_cae_NoncurrentAssetsOtherThanFinancialInstrumentsandDeferredTaxAssets_F91B3DE2023B853F50F79C9D2953C40A" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/OperatingSegmentsAndGeographicInformationOperatingProfitDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_84B303AB9D9DB02CFEFDFF7C1FC4A683" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_1E344C0C4CC0E8764A02FF7C1FC28CA6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_84B303AB9D9DB02CFEFDFF7C1FC4A683" xlink:to="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_1E344C0C4CC0E8764A02FF7C1FC28CA6" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentConsolidationItemsAxis" xlink:label="loc_ifrs-full_SegmentConsolidationItemsAxis_A32B59BC0FA111715E0DFF7C1FC23556" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_1E344C0C4CC0E8764A02FF7C1FC28CA6" xlink:to="loc_ifrs-full_SegmentConsolidationItemsAxis_A32B59BC0FA111715E0DFF7C1FC23556" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:label="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_09097C3AFA3F4074FEF9FF7C1FC3F4B0_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentConsolidationItemsAxis_A32B59BC0FA111715E0DFF7C1FC23556" xlink:to="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_09097C3AFA3F4074FEF9FF7C1FC3F4B0_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:label="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_09097C3AFA3F4074FEF9FF7C1FC3F4B0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentConsolidationItemsAxis_A32B59BC0FA111715E0DFF7C1FC23556" xlink:to="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_09097C3AFA3F4074FEF9FF7C1FC3F4B0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OperatingSegmentsMember" xlink:label="loc_ifrs-full_OperatingSegmentsMember_81390349222C91500955FF7C1FC3D9B2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_09097C3AFA3F4074FEF9FF7C1FC3F4B0" xlink:to="loc_ifrs-full_OperatingSegmentsMember_81390349222C91500955FF7C1FC3D9B2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProfitLossFromOperatingActivities" xlink:label="loc_ifrs-full_ProfitLossFromOperatingActivities_26600E2FC8E8F4A8B3D7FF7C1FC4B0A4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_84B303AB9D9DB02CFEFDFF7C1FC4A683" xlink:to="loc_ifrs-full_ProfitLossFromOperatingActivities_26600E2FC8E8F4A8B3D7FF7C1FC4B0A4" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_RestructuringIntegrationAndAcquisitionCosts" xlink:label="loc_cae_RestructuringIntegrationAndAcquisitionCosts_ACC3C3E9169F7A8467BAFF7C1FC4EBB9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_84B303AB9D9DB02CFEFDFF7C1FC4A683" xlink:to="loc_cae_RestructuringIntegrationAndAcquisitionCosts_ACC3C3E9169F7A8467BAFF7C1FC4EBB9" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/OperatingSegmentsAndGeographicInformationProductsAndServicesInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_9923867751FABFD5A6356D188DF27384" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_11BE24DED3043AE1CF926D188DF19AD2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_9923867751FABFD5A6356D188DF27384" xlink:to="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_11BE24DED3043AE1CF926D188DF19AD2" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProductsAndServicesAxis" xlink:label="loc_ifrs-full_ProductsAndServicesAxis_DB612606F14027597BDD6D188DF2B8EB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_11BE24DED3043AE1CF926D188DF19AD2" xlink:to="loc_ifrs-full_ProductsAndServicesAxis_DB612606F14027597BDD6D188DF2B8EB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProductsAndServicesMember" xlink:label="loc_ifrs-full_ProductsAndServicesMember_171DA44E16885DAAB47F6D188DF23EBF_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ProductsAndServicesAxis_DB612606F14027597BDD6D188DF2B8EB" xlink:to="loc_ifrs-full_ProductsAndServicesMember_171DA44E16885DAAB47F6D188DF23EBF_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProductsAndServicesMember" xlink:label="loc_ifrs-full_ProductsAndServicesMember_171DA44E16885DAAB47F6D188DF23EBF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ProductsAndServicesAxis_DB612606F14027597BDD6D188DF2B8EB" xlink:to="loc_ifrs-full_ProductsAndServicesMember_171DA44E16885DAAB47F6D188DF23EBF" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SimulationProductsMember" xlink:label="loc_cae_SimulationProductsMember_F2F9BE9BD1D531226DA86D188DF2EDBC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ProductsAndServicesMember_171DA44E16885DAAB47F6D188DF23EBF" xlink:to="loc_cae_SimulationProductsMember_F2F9BE9BD1D531226DA86D188DF2EDBC" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TrainingandServicesMember" xlink:label="loc_cae_TrainingandServicesMember_1B2807B88C0A4B667E0C6D188DF25493" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ProductsAndServicesMember_171DA44E16885DAAB47F6D188DF23EBF" xlink:to="loc_cae_TrainingandServicesMember_1B2807B88C0A4B667E0C6D188DF25493" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Revenue" xlink:label="loc_ifrs-full_Revenue_C9F966DE34B2C96A81116D188DF20C90" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_9923867751FABFD5A6356D188DF27384" xlink:to="loc_ifrs-full_Revenue_C9F966DE34B2C96A81116D188DF20C90" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/OperatingSegmentsAndGeographicInformationResultsBySegmentDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_D38F9ADC553F0F30BE769B55920CFB71" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_9D599EF0DB01428FA60D9B55920B42D7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_D38F9ADC553F0F30BE769B55920CFB71" xlink:to="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_9D599EF0DB01428FA60D9B55920B42D7" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentConsolidationItemsAxis" xlink:label="loc_ifrs-full_SegmentConsolidationItemsAxis_ED523A93A03B72F265109B55920BCD9E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_9D599EF0DB01428FA60D9B55920B42D7" xlink:to="loc_ifrs-full_SegmentConsolidationItemsAxis_ED523A93A03B72F265109B55920BCD9E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:label="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_0CF93CEAF8765F50D1479B55920BD60C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentConsolidationItemsAxis_ED523A93A03B72F265109B55920BCD9E" xlink:to="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_0CF93CEAF8765F50D1479B55920BD60C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForSegmentConsolidationItemsMember" xlink:label="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_0CF93CEAF8765F50D1479B55920BD60C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentConsolidationItemsAxis_ED523A93A03B72F265109B55920BCD9E" xlink:to="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_0CF93CEAF8765F50D1479B55920BD60C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OperatingSegmentsMember" xlink:label="loc_ifrs-full_OperatingSegmentsMember_DCAC83EF99734C1CF9F39B55920B263A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSegmentConsolidationItemsMember_0CF93CEAF8765F50D1479B55920BD60C" xlink:to="loc_ifrs-full_OperatingSegmentsMember_DCAC83EF99734C1CF9F39B55920B263A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentsAxis" xlink:label="loc_ifrs-full_SegmentsAxis_C034AA4E1DD142D707D19B55920CC40D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_9D599EF0DB01428FA60D9B55920B42D7" xlink:to="loc_ifrs-full_SegmentsAxis_C034AA4E1DD142D707D19B55920CC40D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentsMember" xlink:label="loc_ifrs-full_SegmentsMember_81137A9824C1F5F30E249B55920C83C1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentsAxis_C034AA4E1DD142D707D19B55920CC40D" xlink:to="loc_ifrs-full_SegmentsMember_81137A9824C1F5F30E249B55920C83C1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SegmentsMember" xlink:label="loc_ifrs-full_SegmentsMember_81137A9824C1F5F30E249B55920C83C1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentsAxis_C034AA4E1DD142D707D19B55920CC40D" xlink:to="loc_ifrs-full_SegmentsMember_81137A9824C1F5F30E249B55920C83C1" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CivilAviationTrainingSolutionsMember" xlink:label="loc_cae_CivilAviationTrainingSolutionsMember_81ED782289A23F1F4CEE9B55920CDC4A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsMember_81137A9824C1F5F30E249B55920C83C1" xlink:to="loc_cae_CivilAviationTrainingSolutionsMember_81ED782289A23F1F4CEE9B55920CDC4A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DefenseandSecurityMember" xlink:label="loc_cae_DefenseandSecurityMember_773B945D8F06BEBD8BD49B55920CBBF0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsMember_81137A9824C1F5F30E249B55920C83C1" xlink:to="loc_cae_DefenseandSecurityMember_773B945D8F06BEBD8BD49B55920CBBF0" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_HealthcareMember" xlink:label="loc_cae_HealthcareMember_76B995DA70EEFC4D48209B55920C5D16" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsMember_81137A9824C1F5F30E249B55920C83C1" xlink:to="loc_cae_HealthcareMember_76B995DA70EEFC4D48209B55920C5D16" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_Revenue" xlink:label="loc_ifrs-full_Revenue_785A22F56EC8F7E7882F9B55920C1D76" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_D38F9ADC553F0F30BE769B55920CFB71" xlink:to="loc_ifrs-full_Revenue_785A22F56EC8F7E7882F9B55920C1D76" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DepreciationandAmortizationExpensePropertyPlantandEquipment" xlink:label="loc_cae_DepreciationandAmortizationExpensePropertyPlantandEquipment_887025D1599B1DB320F79B55920C1F03" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_D38F9ADC553F0F30BE769B55920CFB71" xlink:to="loc_cae_DepreciationandAmortizationExpensePropertyPlantandEquipment_887025D1599B1DB320F79B55920C1F03" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DepreciationandAmortizationExpenseIntangibleandOtherAssets" xlink:label="loc_cae_DepreciationandAmortizationExpenseIntangibleandOtherAssets_E6BEEF3EE5D3BCAE5DD19B55920C883F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_D38F9ADC553F0F30BE769B55920CFB71" xlink:to="loc_cae_DepreciationandAmortizationExpenseIntangibleandOtherAssets_E6BEEF3EE5D3BCAE5DD19B55920C883F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ImpairmentLossOnNonFinancialAssets" xlink:label="loc_cae_ImpairmentLossOnNonFinancialAssets_812E6C5028CDB970B29F9B55920CD107" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_D38F9ADC553F0F30BE769B55920CFB71" xlink:to="loc_cae_ImpairmentLossOnNonFinancialAssets_812E6C5028CDB970B29F9B55920CD107" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_WritedownsReversalsOfInventories" xlink:label="loc_ifrs-full_WritedownsReversalsOfInventories_0606B24EB9C5144D7E729B55920CE29F" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_D38F9ADC553F0F30BE769B55920CFB71" xlink:to="loc_ifrs-full_WritedownsReversalsOfInventories_0606B24EB9C5144D7E729B55920CE29F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossTradeReceivables" xlink:label="loc_ifrs-full_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossTradeReceivables_AF827457B9616553C3949B55920C88BF" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_D38F9ADC553F0F30BE769B55920CFB71" xlink:to="loc_ifrs-full_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossTradeReceivables_AF827457B9616553C3949B55920C88BF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod" xlink:label="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_9A4E077BDE7C397D36BC9B55920C780E" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_D38F9ADC553F0F30BE769B55920CFB71" xlink:to="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_9A4E077BDE7C397D36BC9B55920C780E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProfitLossFromOperatingActivities" xlink:label="loc_ifrs-full_ProfitLossFromOperatingActivities_1297661C1AC8577371CF9B55920C2345" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_D38F9ADC553F0F30BE769B55920CFB71" xlink:to="loc_ifrs-full_ProfitLossFromOperatingActivities_1297661C1AC8577371CF9B55920C2345" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/OperatingSegmentsAndGeographicInformationTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/OtherAssets" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/OtherAssetsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/OtherAssetsInvestmentsInFinanceLeaseContractsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLessorLineItems" xlink:label="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLessorLineItems_57B5A6777AE966328CD049BF390E5E45" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLessorTable" xlink:label="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLessorTable_39E1B5F8DE2AF58D077F49BF390DD8BA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLessorLineItems_57B5A6777AE966328CD049BF390E5E45" xlink:to="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLessorTable_39E1B5F8DE2AF58D077F49BF390DD8BA" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MaturityAxis" xlink:label="loc_ifrs-full_MaturityAxis_9B2569BA98469422BF6849BF395B4E07" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLessorTable_39E1B5F8DE2AF58D077F49BF390DD8BA" xlink:to="loc_ifrs-full_MaturityAxis_9B2569BA98469422BF6849BF395B4E07" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="loc_ifrs-full_AggregatedTimeBandsMember_668FB02F158D91F0339549BF39631ECC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MaturityAxis_9B2569BA98469422BF6849BF395B4E07" xlink:to="loc_ifrs-full_AggregatedTimeBandsMember_668FB02F158D91F0339549BF39631ECC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="loc_ifrs-full_AggregatedTimeBandsMember_668FB02F158D91F0339549BF39631ECC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MaturityAxis_9B2569BA98469422BF6849BF395B4E07" xlink:to="loc_ifrs-full_AggregatedTimeBandsMember_668FB02F158D91F0339549BF39631ECC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NotLaterThanOneYearMember" xlink:label="loc_ifrs-full_NotLaterThanOneYearMember_B79A5977BDE43C56D38C49BF3991DB2A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_668FB02F158D91F0339549BF39631ECC" xlink:to="loc_ifrs-full_NotLaterThanOneYearMember_B79A5977BDE43C56D38C49BF3991DB2A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember" xlink:label="loc_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember_166AC352534574375DA649BF39AE3487" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_668FB02F158D91F0339549BF39631ECC" xlink:to="loc_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember_166AC352534574375DA649BF39AE3487" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanFiveYearsMember" xlink:label="loc_ifrs-full_LaterThanFiveYearsMember_96C546B018953170373549BF39CBC5AB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_668FB02F158D91F0339549BF39631ECC" xlink:to="loc_ifrs-full_LaterThanFiveYearsMember_96C546B018953170373549BF39CBC5AB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GrossInvestmentInFinanceLease" xlink:label="loc_ifrs-full_GrossInvestmentInFinanceLease_69B06D76018FA6BAF9C349BF392BF5F5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLessorLineItems_57B5A6777AE966328CD049BF390E5E45" xlink:to="loc_ifrs-full_GrossInvestmentInFinanceLease_69B06D76018FA6BAF9C349BF392BF5F5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MinimumFinanceLeasePaymentsReceivableAtPresentValue" xlink:label="loc_ifrs-full_MinimumFinanceLeasePaymentsReceivableAtPresentValue_F71829B89049CAD1B29F49BF39445FA2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinanceLeaseAndOperatingLeaseByLessorLineItems_57B5A6777AE966328CD049BF390E5E45" xlink:to="loc_ifrs-full_MinimumFinanceLeasePaymentsReceivableAtPresentValue_F71829B89049CAD1B29F49BF39445FA2" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/OtherAssetsPaymentReceivablesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/OtherAssetsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/OtherGainsNet" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/OtherGainsNetDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfBusinessCombinationsLineItems" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_A8E9A18D5371C3D13686B285CBE387EF" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfBusinessCombinationsTable" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_F7242975EBB65BB42022B285CBE2BEA9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_A8E9A18D5371C3D13686B285CBE387EF" xlink:to="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_F7242975EBB65BB42022B285CBE2BEA9" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis" xlink:label="loc_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis_6F7383DCDD50E7511D40B285CBE2E9D1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_F7242975EBB65BB42022B285CBE2BEA9" xlink:to="loc_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis_6F7383DCDD50E7511D40B285CBE2E9D1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsAndGoodwillMember" xlink:label="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_FEA3259FE69479A65B43B285CBE29C59_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis_6F7383DCDD50E7511D40B285CBE2E9D1" xlink:to="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_FEA3259FE69479A65B43B285CBE29C59_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IntangibleAssetsAndGoodwillMember" xlink:label="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_FEA3259FE69479A65B43B285CBE29C59" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis_6F7383DCDD50E7511D40B285CBE2E9D1" xlink:to="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_FEA3259FE69479A65B43B285CBE29C59" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GoodwillMember" xlink:label="loc_ifrs-full_GoodwillMember_48EE7C41418C6CB7B132B285CBE26C2B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IntangibleAssetsAndGoodwillMember_FEA3259FE69479A65B43B285CBE29C59" xlink:to="loc_ifrs-full_GoodwillMember_48EE7C41418C6CB7B132B285CBE26C2B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfAssetsAxis" xlink:label="loc_ifrs-full_ClassesOfAssetsAxis_A9DA5F292DBFBC850A77B285CBE28B77" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_F7242975EBB65BB42022B285CBE2BEA9" xlink:to="loc_ifrs-full_ClassesOfAssetsAxis_A9DA5F292DBFBC850A77B285CBE28B77" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfAssetsMember" xlink:label="loc_ifrs-full_ClassesOfAssetsMember_4EC076F3D236D9788C8EB285CBE244FA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfAssetsAxis_A9DA5F292DBFBC850A77B285CBE28B77" xlink:to="loc_ifrs-full_ClassesOfAssetsMember_4EC076F3D236D9788C8EB285CBE244FA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfAssetsMember" xlink:label="loc_ifrs-full_ClassesOfAssetsMember_4EC076F3D236D9788C8EB285CBE244FA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfAssetsAxis_A9DA5F292DBFBC850A77B285CBE28B77" xlink:to="loc_ifrs-full_ClassesOfAssetsMember_4EC076F3D236D9788C8EB285CBE244FA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InvestmentsAccountedForUsingEquityMethodMember" xlink:label="loc_ifrs-full_InvestmentsAccountedForUsingEquityMethodMember_0035E3086362D2BA3B90B285CBE20199" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsMember_4EC076F3D236D9788C8EB285CBE244FA" xlink:to="loc_ifrs-full_InvestmentsAccountedForUsingEquityMethodMember_0035E3086362D2BA3B90B285CBE20199" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BusinessCombinationsAxis" xlink:label="loc_ifrs-full_BusinessCombinationsAxis_C899E74D0FA3ECC74E1BB285CBE2B8A7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_F7242975EBB65BB42022B285CBE2BEA9" xlink:to="loc_ifrs-full_BusinessCombinationsAxis_C899E74D0FA3ECC74E1BB285CBE2B8A7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForBusinessCombinationsMember" xlink:label="loc_ifrs-full_EntitysTotalForBusinessCombinationsMember_F3A78C5751C59CA9771DB285CBE21760_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_C899E74D0FA3ECC74E1BB285CBE2B8A7" xlink:to="loc_ifrs-full_EntitysTotalForBusinessCombinationsMember_F3A78C5751C59CA9771DB285CBE21760_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForBusinessCombinationsMember" xlink:label="loc_ifrs-full_EntitysTotalForBusinessCombinationsMember_F3A78C5751C59CA9771DB285CBE21760" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_C899E74D0FA3ECC74E1BB285CBE2B8A7" xlink:to="loc_ifrs-full_EntitysTotalForBusinessCombinationsMember_F3A78C5751C59CA9771DB285CBE21760" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AsianAviationCentreofExcellenceSdn.Bhd.Member" xlink:label="loc_cae_AsianAviationCentreofExcellenceSdn.Bhd.Member_DEA08C16C1977D1D70A1B285CBE2FC6C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForBusinessCombinationsMember_F3A78C5751C59CA9771DB285CBE21760" xlink:to="loc_cae_AsianAviationCentreofExcellenceSdn.Bhd.Member_DEA08C16C1977D1D70A1B285CBE2FC6C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_JointVenturesAxis" xlink:label="loc_ifrs-full_JointVenturesAxis_D655520FE3EDB323168CB285CBE3FDA5" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_F7242975EBB65BB42022B285CBE2BEA9" xlink:to="loc_ifrs-full_JointVenturesAxis_D655520FE3EDB323168CB285CBE3FDA5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForJointVenturesMember" xlink:label="loc_ifrs-full_EntitysTotalForJointVenturesMember_5377586BC55F4D961B28B285CBE3048B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_JointVenturesAxis_D655520FE3EDB323168CB285CBE3FDA5" xlink:to="loc_ifrs-full_EntitysTotalForJointVenturesMember_5377586BC55F4D961B28B285CBE3048B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForJointVenturesMember" xlink:label="loc_ifrs-full_EntitysTotalForJointVenturesMember_5377586BC55F4D961B28B285CBE3048B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_JointVenturesAxis_D655520FE3EDB323168CB285CBE3FDA5" xlink:to="loc_ifrs-full_EntitysTotalForJointVenturesMember_5377586BC55F4D961B28B285CBE3048B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ZhuhaiXiangYiAviationTechnologyCompanyLimitedMember" xlink:label="loc_cae_ZhuhaiXiangYiAviationTechnologyCompanyLimitedMember_5E11A71A69BD22595E22B285CBE35C87" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_5377586BC55F4D961B28B285CBE3048B" xlink:to="loc_cae_ZhuhaiXiangYiAviationTechnologyCompanyLimitedMember_5E11A71A69BD22595E22B285CBE35C87" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AsianAviationCentreofExcellenceSdn.Bhd.Member" xlink:label="loc_cae_AsianAviationCentreofExcellenceSdn.Bhd.Member_4F8D3B906BDD89EBD43DB285CBE3EB0F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_5377586BC55F4D961B28B285CBE3048B" xlink:to="loc_cae_AsianAviationCentreofExcellenceSdn.Bhd.Member_4F8D3B906BDD89EBD43DB285CBE3EB0F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EquityMethodInvestmentSoldPercent" xlink:label="loc_cae_EquityMethodInvestmentSoldPercent_A6D0C091BCB087FC01EBB285CBE3DAB2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_A8E9A18D5371C3D13686B285CBE387EF" xlink:to="loc_cae_EquityMethodInvestmentSoldPercent_A6D0C091BCB087FC01EBB285CBE3DAB2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProceedsFromSalesOfInvestmentsAccountedForUsingEquityMethod" xlink:label="loc_ifrs-full_ProceedsFromSalesOfInvestmentsAccountedForUsingEquityMethod_D708F723A44914C8F887B285CBE377C1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_A8E9A18D5371C3D13686B285CBE387EF" xlink:to="loc_ifrs-full_ProceedsFromSalesOfInvestmentsAccountedForUsingEquityMethod_D708F723A44914C8F887B285CBE377C1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisposalsIntangibleAssetsAndGoodwill" xlink:label="loc_ifrs-full_DisposalsIntangibleAssetsAndGoodwill_1C54DA0983AAB41A4F03B285CBE364E7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_A8E9A18D5371C3D13686B285CBE387EF" xlink:to="loc_ifrs-full_DisposalsIntangibleAssetsAndGoodwill_1C54DA0983AAB41A4F03B285CBE364E7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ImpairmentLossRecognisedInProfitOrLoss" xlink:label="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss_0654CADD69CDAE5625A6B285CBE32576" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_A8E9A18D5371C3D13686B285CBE387EF" xlink:to="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss_0654CADD69CDAE5625A6B285CBE32576" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GainsLossesOnDisposalsOfInvestments" xlink:label="loc_ifrs-full_GainsLossesOnDisposalsOfInvestments_BB3224C9B17FFE2815E6B285CBE4BE8B" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_A8E9A18D5371C3D13686B285CBE387EF" xlink:to="loc_ifrs-full_GainsLossesOnDisposalsOfInvestments_BB3224C9B17FFE2815E6B285CBE4BE8B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProportionOfOwnershipInterestInJointVenture" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInJointVenture_B28421CEBCDC4DAF3B46B285CBE4844D" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_A8E9A18D5371C3D13686B285CBE387EF" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInJointVenture_B28421CEBCDC4DAF3B46B285CBE4844D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_350A3E54A7D528A470C5B285CBE4D596" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_A8E9A18D5371C3D13686B285CBE387EF" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_350A3E54A7D528A470C5B285CBE4D596" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GainLossRecognisedAsResultOfRemeasuringToFairValueEquityInterestInAcquireeHeldByAcquirerBeforeBusinessCombination" xlink:label="loc_ifrs-full_GainLossRecognisedAsResultOfRemeasuringToFairValueEquityInterestInAcquireeHeldByAcquirerBeforeBusinessCombination_4E05C2B606F555241D22B285CBE4C98B" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_A8E9A18D5371C3D13686B285CBE387EF" xlink:to="loc_ifrs-full_GainLossRecognisedAsResultOfRemeasuringToFairValueEquityInterestInAcquireeHeldByAcquirerBeforeBusinessCombination_4E05C2B606F555241D22B285CBE4C98B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_RemeasurementOfEquityMethodInvestmentsCosts" xlink:label="loc_cae_RemeasurementOfEquityMethodInvestmentsCosts_54A2BC47DAA8FF7A8746B285CBE424DE" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_A8E9A18D5371C3D13686B285CBE387EF" xlink:to="loc_cae_RemeasurementOfEquityMethodInvestmentsCosts_54A2BC47DAA8FF7A8746B285CBE424DE" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_RestructuringIntegrationAndAcquisitionCosts" xlink:label="loc_cae_RestructuringIntegrationAndAcquisitionCosts_A89C46A0D50516073D12B285CBE4804A" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_A8E9A18D5371C3D13686B285CBE387EF" xlink:to="loc_cae_RestructuringIntegrationAndAcquisitionCosts_A89C46A0D50516073D12B285CBE4804A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ImpairmentLoss" xlink:label="loc_ifrs-full_ImpairmentLoss_5FA7874E7BC193FE295AB285CBE40141" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_A8E9A18D5371C3D13686B285CBE387EF" xlink:to="loc_ifrs-full_ImpairmentLoss_5FA7874E7BC193FE295AB285CBE40141" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_GainLossesOnRemeasurementOfEquityMethodInvestments" xlink:label="loc_cae_GainLossesOnRemeasurementOfEquityMethodInvestments_0A8D94EE9E1F2E05CD27B285CBE4B9A2" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_A8E9A18D5371C3D13686B285CBE387EF" xlink:to="loc_cae_GainLossesOnRemeasurementOfEquityMethodInvestments_0A8D94EE9E1F2E05CD27B285CBE4B9A2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ReorganizationAndOtherCosts" xlink:label="loc_cae_ReorganizationAndOtherCosts_0D979A9328E8CAEAA3DCB285CBE4A8BB" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_A8E9A18D5371C3D13686B285CBE387EF" xlink:to="loc_cae_ReorganizationAndOtherCosts_0D979A9328E8CAEAA3DCB285CBE4A8BB" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_GainLossOnRemeasurementOfEquityMethodInvestmentsNetOfReorganizationCosts" xlink:label="loc_cae_GainLossOnRemeasurementOfEquityMethodInvestmentsNetOfReorganizationCosts_42B9AFE302FB3DC45EA3B285CBE4E161" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_A8E9A18D5371C3D13686B285CBE387EF" xlink:to="loc_cae_GainLossOnRemeasurementOfEquityMethodInvestmentsNetOfReorganizationCosts_42B9AFE302FB3DC45EA3B285CBE4E161" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/OtherGainsNetGainsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/OtherGainsNetTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/PropertyPlantAndEquipment" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/PropertyPlantAndEquipmentDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_9D7655D3457016E09C9C1E8CBD595CCE" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_16540BFD3B9BB03C9D9B1E8CBD540E24" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_9D7655D3457016E09C9C1E8CBD595CCE" xlink:to="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_16540BFD3B9BB03C9D9B1E8CBD540E24" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis" xlink:label="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_CA6B967A0D309459830B1E8CBD542973" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_16540BFD3B9BB03C9D9B1E8CBD540E24" xlink:to="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_CA6B967A0D309459830B1E8CBD542973" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PropertyPlantAndEquipmentMember" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentMember_085BB6AE6E87152A24401E8CBD544035_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_CA6B967A0D309459830B1E8CBD542973" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentMember_085BB6AE6E87152A24401E8CBD544035_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PropertyPlantAndEquipmentMember" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentMember_085BB6AE6E87152A24401E8CBD544035" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_CA6B967A0D309459830B1E8CBD542973" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentMember_085BB6AE6E87152A24401E8CBD544035" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LandMember" xlink:label="loc_ifrs-full_LandMember_444A3CC325613155B2211E8CBD559719" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_085BB6AE6E87152A24401E8CBD544035" xlink:to="loc_ifrs-full_LandMember_444A3CC325613155B2211E8CBD559719" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BuildingsMember" xlink:label="loc_ifrs-full_BuildingsMember_471D128B9692EFB34F0B1E8CBD55AAF9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_085BB6AE6E87152A24401E8CBD544035" xlink:to="loc_ifrs-full_BuildingsMember_471D128B9692EFB34F0B1E8CBD55AAF9" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SimulatorsMember" xlink:label="loc_cae_SimulatorsMember_AD9BE72DFA675463299C1E8CBD5544E6" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_085BB6AE6E87152A24401E8CBD544035" xlink:to="loc_cae_SimulatorsMember_AD9BE72DFA675463299C1E8CBD5544E6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MachineryMember" xlink:label="loc_ifrs-full_MachineryMember_2B2D36D081D9395E5D111E8CBD556075" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_085BB6AE6E87152A24401E8CBD544035" xlink:to="loc_ifrs-full_MachineryMember_2B2D36D081D9395E5D111E8CBD556075" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AircraftAndAircraftEnginesMember" xlink:label="loc_cae_AircraftAndAircraftEnginesMember_F47EE880A0DB57452C531E8CBD55438E" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_085BB6AE6E87152A24401E8CBD544035" xlink:to="loc_cae_AircraftAndAircraftEnginesMember_F47EE880A0DB57452C531E8CBD55438E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AssetsUnderFinanceLeaseMember" xlink:label="loc_cae_AssetsUnderFinanceLeaseMember_81CF816709B2A1E4842B1E8CBD5678DD" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_085BB6AE6E87152A24401E8CBD544035" xlink:to="loc_cae_AssetsUnderFinanceLeaseMember_81CF816709B2A1E4842B1E8CBD5678DD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ConstructionInProgressMember" xlink:label="loc_ifrs-full_ConstructionInProgressMember_27084B3AD291D8E16FE41E8CBD56ABB1" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_085BB6AE6E87152A24401E8CBD544035" xlink:to="loc_ifrs-full_ConstructionInProgressMember_27084B3AD291D8E16FE41E8CBD56ABB1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PropertyPlantAndEquipmentUnderOperatingLeasesMember" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentUnderOperatingLeasesMember_ED7EF6E080D9EB5CD3DD1E8CBD563B6F" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_085BB6AE6E87152A24401E8CBD544035" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentUnderOperatingLeasesMember_ED7EF6E080D9EB5CD3DD1E8CBD563B6F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SimulatorsUnderFinanceLeaseMember" xlink:label="loc_cae_SimulatorsUnderFinanceLeaseMember_E9A4589235C2BA5840D71E8CBD561ED2" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_085BB6AE6E87152A24401E8CBD544035" xlink:to="loc_cae_SimulatorsUnderFinanceLeaseMember_E9A4589235C2BA5840D71E8CBD561ED2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_BuildingsUnderFinanceLeaseMember" xlink:label="loc_cae_BuildingsUnderFinanceLeaseMember_27A5F9DF6669D2689F471E8CBD56AF64" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_085BB6AE6E87152A24401E8CBD544035" xlink:to="loc_cae_BuildingsUnderFinanceLeaseMember_27A5F9DF6669D2689F471E8CBD56AF64" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PropertyPlantandEquipmentUnderFinanceLeaseMember" xlink:label="loc_cae_PropertyPlantandEquipmentUnderFinanceLeaseMember_092A5DF5EFCA7837421C1E8CBD56416E" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_085BB6AE6E87152A24401E8CBD544035" xlink:to="loc_cae_PropertyPlantandEquipmentUnderFinanceLeaseMember_092A5DF5EFCA7837421C1E8CBD56416E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_9BA429AD852EFB343D791E8CBD57B957" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_16540BFD3B9BB03C9D9B1E8CBD540E24" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_9BA429AD852EFB343D791E8CBD57B957" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CarryingAmountMember" xlink:label="loc_ifrs-full_CarryingAmountMember_DA0D0773CCFA2E6898331E8CBD57040A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_9BA429AD852EFB343D791E8CBD57B957" xlink:to="loc_ifrs-full_CarryingAmountMember_DA0D0773CCFA2E6898331E8CBD57040A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CarryingAmountMember" xlink:label="loc_ifrs-full_CarryingAmountMember_DA0D0773CCFA2E6898331E8CBD57040A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_9BA429AD852EFB343D791E8CBD57B957" xlink:to="loc_ifrs-full_CarryingAmountMember_DA0D0773CCFA2E6898331E8CBD57040A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_GrossCarryingAmountMember" xlink:label="loc_ifrs-full_GrossCarryingAmountMember_46605E56A7BBC24499261E8CBD577868" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_DA0D0773CCFA2E6898331E8CBD57040A" xlink:to="loc_ifrs-full_GrossCarryingAmountMember_46605E56A7BBC24499261E8CBD577868" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AccumulatedDepreciationAndAmortisationMember" xlink:label="loc_ifrs-full_AccumulatedDepreciationAndAmortisationMember_78EF7A16C4F2D803AD881E8CBD585F58" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_DA0D0773CCFA2E6898331E8CBD57040A" xlink:to="loc_ifrs-full_AccumulatedDepreciationAndAmortisationMember_78EF7A16C4F2D803AD881E8CBD585F58" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MaturityAxis" xlink:label="loc_ifrs-full_MaturityAxis_EF331275ED503CDD56FA1E8CBD58D990" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_16540BFD3B9BB03C9D9B1E8CBD540E24" xlink:to="loc_ifrs-full_MaturityAxis_EF331275ED503CDD56FA1E8CBD58D990" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="loc_ifrs-full_AggregatedTimeBandsMember_CDFC71EC86ED111723451E8CBD58E952_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MaturityAxis_EF331275ED503CDD56FA1E8CBD58D990" xlink:to="loc_ifrs-full_AggregatedTimeBandsMember_CDFC71EC86ED111723451E8CBD58E952_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AggregatedTimeBandsMember" xlink:label="loc_ifrs-full_AggregatedTimeBandsMember_CDFC71EC86ED111723451E8CBD58E952" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MaturityAxis_EF331275ED503CDD56FA1E8CBD58D990" xlink:to="loc_ifrs-full_AggregatedTimeBandsMember_CDFC71EC86ED111723451E8CBD58E952" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NotLaterThanOneYearMember" xlink:label="loc_ifrs-full_NotLaterThanOneYearMember_B20E6B932842507441E61E8CBD58FD63" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_CDFC71EC86ED111723451E8CBD58E952" xlink:to="loc_ifrs-full_NotLaterThanOneYearMember_B20E6B932842507441E61E8CBD58FD63" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember" xlink:label="loc_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember_B2F8069A7136416A7A241E8CBD58A836" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_CDFC71EC86ED111723451E8CBD58E952" xlink:to="loc_ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember_B2F8069A7136416A7A241E8CBD58A836" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LaterThanFiveYearsMember" xlink:label="loc_ifrs-full_LaterThanFiveYearsMember_04E3B1BD068D4AA947E01E8CBD597745" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AggregatedTimeBandsMember_CDFC71EC86ED111723451E8CBD58E952" xlink:to="loc_ifrs-full_LaterThanFiveYearsMember_04E3B1BD068D4AA947E01E8CBD597745" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract" xlink:label="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_7D15832E9CEC5BFA24641E8CBD59224D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_9D7655D3457016E09C9C1E8CBD595CCE" xlink:to="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_7D15832E9CEC5BFA24641E8CBD59224D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PropertyPlantAndEquipment" xlink:label="loc_ifrs-full_PropertyPlantAndEquipment_1B71AD1DDA5E3133DC461E8CBD59AF2C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_7D15832E9CEC5BFA24641E8CBD59224D" xlink:to="loc_ifrs-full_PropertyPlantAndEquipment_1B71AD1DDA5E3133DC461E8CBD59AF2C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:label="loc_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment_1C00A3847FEEB5563B1F1E8CBD5AA352" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_7D15832E9CEC5BFA24641E8CBD59224D" xlink:to="loc_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment_1C00A3847FEEB5563B1F1E8CBD5AA352" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment" xlink:label="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment_1F22155C2E3FB1E9E52D1E8CBD5A7BB4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_7D15832E9CEC5BFA24641E8CBD59224D" xlink:to="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment_1F22155C2E3FB1E9E52D1E8CBD5A7BB4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisposalsPropertyPlantAndEquipment" xlink:label="loc_ifrs-full_DisposalsPropertyPlantAndEquipment_177FCAB7B755C4B4A6A91E8CBD5A7B72" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_7D15832E9CEC5BFA24641E8CBD59224D" xlink:to="loc_ifrs-full_DisposalsPropertyPlantAndEquipment_177FCAB7B755C4B4A6A91E8CBD5A7B72" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DepreciationPropertyPlantAndEquipment" xlink:label="loc_ifrs-full_DepreciationPropertyPlantAndEquipment_1534D85ECD8CA0C8A3871E8CBD5A7824" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_7D15832E9CEC5BFA24641E8CBD59224D" xlink:to="loc_ifrs-full_DepreciationPropertyPlantAndEquipment_1534D85ECD8CA0C8A3871E8CBD5A7824" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment" xlink:label="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment_F9E3EA2330BC414D69CB1E8CBD5A5D2E" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_7D15832E9CEC5BFA24641E8CBD59224D" xlink:to="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLossPropertyPlantAndEquipment_F9E3EA2330BC414D69CB1E8CBD5A5D2E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesPropertyPlantAndEquipment" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesPropertyPlantAndEquipment_8F4A7591C779F1D195C51E8CBD5AD644" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_7D15832E9CEC5BFA24641E8CBD59224D" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesPropertyPlantAndEquipment_8F4A7591C779F1D195C51E8CBD5AD644" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment_0F00DEF8C731A9EC7FDA1E8CBD5B3618" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_7D15832E9CEC5BFA24641E8CBD59224D" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment_0F00DEF8C731A9EC7FDA1E8CBD5B3618" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AmortizationPeriodPropertyPlantAndEquipment" xlink:label="loc_cae_AmortizationPeriodPropertyPlantAndEquipment_1DDEBDCA0061EA6C43791E8CBD5BCA3A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_9D7655D3457016E09C9C1E8CBD595CCE" xlink:to="loc_cae_AmortizationPeriodPropertyPlantAndEquipment_1DDEBDCA0061EA6C43791E8CBD5BCA3A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PropertyPlantAndEquipmentPledgedAsSecurity" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentPledgedAsSecurity_C04CA29A7FF50D5DBC0A1E8CBD5B2AC9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_9D7655D3457016E09C9C1E8CBD595CCE" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentPledgedAsSecurity_C04CA29A7FF50D5DBC0A1E8CBD5B2AC9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MinimumLeasePaymentsReceivableUnderNoncancellableOperatingLease" xlink:label="loc_ifrs-full_MinimumLeasePaymentsReceivableUnderNoncancellableOperatingLease_1142C8D0E52815CE181D1E8CBD5B3551" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_9D7655D3457016E09C9C1E8CBD595CCE" xlink:to="loc_ifrs-full_MinimumLeasePaymentsReceivableUnderNoncancellableOperatingLease_1142C8D0E52815CE181D1E8CBD5B3551" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RecognisedFinanceLeaseAsAssets" xlink:label="loc_ifrs-full_RecognisedFinanceLeaseAsAssets_0EE5A289DAECBB11E4A61E8CBD5B3510" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_9D7655D3457016E09C9C1E8CBD595CCE" xlink:to="loc_ifrs-full_RecognisedFinanceLeaseAsAssets_0EE5A289DAECBB11E4A61E8CBD5B3510" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/PropertyPlantAndEquipmentTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/Provisions" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/ProvisionsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOtherProvisionsLineItems" xlink:label="loc_ifrs-full_DisclosureOfOtherProvisionsLineItems_E0358B08D715681113181E8CBCFDF02A" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfOtherProvisionsTable" xlink:label="loc_ifrs-full_DisclosureOfOtherProvisionsTable_1E3362512BA312FF579B1E8CBCFA4C2D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfOtherProvisionsLineItems_E0358B08D715681113181E8CBCFDF02A" xlink:to="loc_ifrs-full_DisclosureOfOtherProvisionsTable_1E3362512BA312FF579B1E8CBCFA4C2D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangeAxis" xlink:label="loc_ifrs-full_RangeAxis_70415B318A35C9BAF2C61E8CBCFA0CB9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOtherProvisionsTable_1E3362512BA312FF579B1E8CBCFA4C2D" xlink:to="loc_ifrs-full_RangeAxis_70415B318A35C9BAF2C61E8CBCFA0CB9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="loc_ifrs-full_RangesMember_7BBD15B344890DB35AB81E8CBCFBF729_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_70415B318A35C9BAF2C61E8CBCFA0CB9" xlink:to="loc_ifrs-full_RangesMember_7BBD15B344890DB35AB81E8CBCFBF729_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="loc_ifrs-full_RangesMember_7BBD15B344890DB35AB81E8CBCFBF729" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_70415B318A35C9BAF2C61E8CBCFA0CB9" xlink:to="loc_ifrs-full_RangesMember_7BBD15B344890DB35AB81E8CBCFBF729" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BottomOfRangeMember" xlink:label="loc_ifrs-full_BottomOfRangeMember_7F1A3EC6DEC4FB2F60091E8CBCFBA09C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesMember_7BBD15B344890DB35AB81E8CBCFBF729" xlink:to="loc_ifrs-full_BottomOfRangeMember_7F1A3EC6DEC4FB2F60091E8CBCFBA09C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TopOfRangeMember" xlink:label="loc_ifrs-full_TopOfRangeMember_160B16D8D532FC1639001E8CBCFB8E86" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesMember_7BBD15B344890DB35AB81E8CBCFBF729" xlink:to="loc_ifrs-full_TopOfRangeMember_160B16D8D532FC1639001E8CBCFB8E86" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfProvisionsAxis" xlink:label="loc_ifrs-full_ClassesOfProvisionsAxis_6FF71CB8D529FEC134191E8CBCFB1C4B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOtherProvisionsTable_1E3362512BA312FF579B1E8CBCFA4C2D" xlink:to="loc_ifrs-full_ClassesOfProvisionsAxis_6FF71CB8D529FEC134191E8CBCFB1C4B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherProvisionsMember" xlink:label="loc_ifrs-full_OtherProvisionsMember_F4D42627545230106A9A1E8CBCFC8D12_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfProvisionsAxis_6FF71CB8D529FEC134191E8CBCFB1C4B" xlink:to="loc_ifrs-full_OtherProvisionsMember_F4D42627545230106A9A1E8CBCFC8D12_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherProvisionsMember" xlink:label="loc_ifrs-full_OtherProvisionsMember_F4D42627545230106A9A1E8CBCFC8D12" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfProvisionsAxis_6FF71CB8D529FEC134191E8CBCFB1C4B" xlink:to="loc_ifrs-full_OtherProvisionsMember_F4D42627545230106A9A1E8CBCFC8D12" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember" xlink:label="loc_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember_177ED5F829D183D6A1A41E8CBCFCE232" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_OtherProvisionsMember_F4D42627545230106A9A1E8CBCFC8D12" xlink:to="loc_ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember_177ED5F829D183D6A1A41E8CBCFCE232" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RestructuringProvisionMember" xlink:label="loc_ifrs-full_RestructuringProvisionMember_3BCD637C71214EF50F501E8CBCFC8DED" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_OtherProvisionsMember_F4D42627545230106A9A1E8CBCFC8D12" xlink:to="loc_ifrs-full_RestructuringProvisionMember_3BCD637C71214EF50F501E8CBCFC8DED" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LegalProceedingsProvisionMember" xlink:label="loc_ifrs-full_LegalProceedingsProvisionMember_539D54FFA0F85B4F9BBE1E8CBCFC7D7B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_OtherProvisionsMember_F4D42627545230106A9A1E8CBCFC8D12" xlink:to="loc_ifrs-full_LegalProceedingsProvisionMember_539D54FFA0F85B4F9BBE1E8CBCFC7D7B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_WarrantyProvisionMember" xlink:label="loc_ifrs-full_WarrantyProvisionMember_43354443CA9582E1B5E51E8CBCFDF1DC" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_OtherProvisionsMember_F4D42627545230106A9A1E8CBCFC8D12" xlink:to="loc_ifrs-full_WarrantyProvisionMember_43354443CA9582E1B5E51E8CBCFDF1DC" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ContingentConsiderationProvisionMember" xlink:label="loc_cae_ContingentConsiderationProvisionMember_11D6DC83A7E1E18491291E8CBCFD1BFC" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_OtherProvisionsMember_F4D42627545230106A9A1E8CBCFC8D12" xlink:to="loc_cae_ContingentConsiderationProvisionMember_11D6DC83A7E1E18491291E8CBCFD1BFC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_MiscellaneousOtherProvisionsMember" xlink:label="loc_ifrs-full_MiscellaneousOtherProvisionsMember_B489E3B545CD8609E39E1E8CBCFD00A7" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_OtherProvisionsMember_F4D42627545230106A9A1E8CBCFC8D12" xlink:to="loc_ifrs-full_MiscellaneousOtherProvisionsMember_B489E3B545CD8609E39E1E8CBCFD00A7" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ExpectedWarrantyClaimsPeriod" xlink:label="loc_cae_ExpectedWarrantyClaimsPeriod_290BED731EC227CF62D91E8CBCFDE0D8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOtherProvisionsLineItems_E0358B08D715681113181E8CBCFDF02A" xlink:to="loc_cae_ExpectedWarrantyClaimsPeriod_290BED731EC227CF62D91E8CBCFDE0D8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ReconciliationOfChangesInOtherProvisionsAbstract" xlink:label="loc_ifrs-full_ReconciliationOfChangesInOtherProvisionsAbstract_DD3B1063171BC0B42EF61E8CBCFE1786" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOtherProvisionsLineItems_E0358B08D715681113181E8CBCFDF02A" xlink:to="loc_ifrs-full_ReconciliationOfChangesInOtherProvisionsAbstract_DD3B1063171BC0B42EF61E8CBCFE1786" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherProvisions" xlink:label="loc_ifrs-full_OtherProvisions_23C536E47A559AF2B68D1E8CBCFE379F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInOtherProvisionsAbstract_DD3B1063171BC0B42EF61E8CBCFE1786" xlink:to="loc_ifrs-full_OtherProvisions_23C536E47A559AF2B68D1E8CBCFE379F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AdditionalProvisionsOtherProvisions" xlink:label="loc_ifrs-full_AdditionalProvisionsOtherProvisions_5B2734B15E88B075C02B1E8CBCFE2009" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInOtherProvisionsAbstract_DD3B1063171BC0B42EF61E8CBCFE1786" xlink:to="loc_ifrs-full_AdditionalProvisionsOtherProvisions_5B2734B15E88B075C02B1E8CBCFE2009" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_AcquisitionsThroughBusinessCombinationsOtherProvisions" xlink:label="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsOtherProvisions_77851F48CAAD17E570601E8CBCFE883B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInOtherProvisionsAbstract_DD3B1063171BC0B42EF61E8CBCFE1786" xlink:to="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsOtherProvisions_77851F48CAAD17E570601E8CBCFE883B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProvisionUsedOtherProvisions" xlink:label="loc_ifrs-full_ProvisionUsedOtherProvisions_A3C9E2BC43833DF3CFD71E8CBCFEC9A1" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInOtherProvisionsAbstract_DD3B1063171BC0B42EF61E8CBCFE1786" xlink:to="loc_ifrs-full_ProvisionUsedOtherProvisions_A3C9E2BC43833DF3CFD71E8CBCFEC9A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_UnusedProvisionReversedOtherProvisions" xlink:label="loc_ifrs-full_UnusedProvisionReversedOtherProvisions_052E1A4AA23F28398FDD1E8CBCFF20B5" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInOtherProvisionsAbstract_DD3B1063171BC0B42EF61E8CBCFE1786" xlink:to="loc_ifrs-full_UnusedProvisionReversedOtherProvisions_052E1A4AA23F28398FDD1E8CBCFF20B5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesOtherProvisions" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesOtherProvisions_2E18E8BA16090FE0BE771E8CBCFFEB29" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInOtherProvisionsAbstract_DD3B1063171BC0B42EF61E8CBCFE1786" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesOtherProvisions_2E18E8BA16090FE0BE771E8CBCFFEB29" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherShorttermProvisions" xlink:label="loc_ifrs-full_OtherShorttermProvisions_030BD0E4B4E0D9A7AB6F1E8CBCFF9DA3" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOtherProvisionsLineItems_E0358B08D715681113181E8CBCFDF02A" xlink:to="loc_ifrs-full_OtherShorttermProvisions_030BD0E4B4E0D9A7AB6F1E8CBCFF9DA3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherLongtermProvisions" xlink:label="loc_ifrs-full_OtherLongtermProvisions_13DD2F1261AF6C74A7811E8CBCFFF861" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOtherProvisionsLineItems_E0358B08D715681113181E8CBCFDF02A" xlink:to="loc_ifrs-full_OtherLongtermProvisions_13DD2F1261AF6C74A7811E8CBCFFF861" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/ProvisionsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/RelatedPartyRelationships" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/RelatedPartyRelationshipsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:label="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_0D73678ECA655570D9121E48A59262C6" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable" xlink:label="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_C11424567F2BC98050EC1E48A563E343" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_0D73678ECA655570D9121E48A59262C6" xlink:to="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_C11424567F2BC98050EC1E48A563E343" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesAxis" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_0A1F2AFE71CC40C3F7261E48A564C05B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_C11424567F2BC98050EC1E48A563E343" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_0A1F2AFE71CC40C3F7261E48A564C05B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForSubsidiariesMember" xlink:label="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_0A1F2AFE71CC40C3F7261E48A564C05B" xlink:to="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForSubsidiariesMember" xlink:label="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_0A1F2AFE71CC40C3F7261E48A564C05B" xlink:to="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AACEVietnamLimitedLiabilityCompanyMember" xlink:label="loc_cae_AACEVietnamLimitedLiabilityCompanyMember_9F4F00999C0BD20EDB301E48A565D812" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_AACEVietnamLimitedLiabilityCompanyMember_9F4F00999C0BD20EDB301E48A565D812" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEKualaLumpurSdnBdhMember" xlink:label="loc_cae_CAEKualaLumpurSdnBdhMember_0D21FEA3600D6F60338B1E48A5654244" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEKualaLumpurSdnBdhMember_0D21FEA3600D6F60338B1E48A5654244" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AsianAviationCentreofExcellenceSingaporePteLtdMember" xlink:label="loc_cae_AsianAviationCentreofExcellenceSingaporePteLtdMember_7C7A0F230433FC547F841E48A5656A6C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_AsianAviationCentreofExcellenceSingaporePteLtdMember_7C7A0F230433FC547F841E48A5656A6C" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEUKplcMember" xlink:label="loc_cae_CAEUKplcMember_BA98D488DB9E5295783A1E48A566BE71" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEUKplcMember_BA98D488DB9E5295783A1E48A566BE71" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEUSInc.Member" xlink:label="loc_cae_CAEUSInc.Member_92C6726DEBF2F7AC092D1E48A5662AD5" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEUSInc.Member_92C6726DEBF2F7AC092D1E48A5662AD5" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEAircrewTrainingServicesplcMember" xlink:label="loc_cae_CAEAircrewTrainingServicesplcMember_4E639D372F01E644DD3E1E48A566F2D4" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEAircrewTrainingServicesplcMember_4E639D372F01E644DD3E1E48A566F2D4" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEAustraliaPtyLtd.Member" xlink:label="loc_cae_CAEAustraliaPtyLtd.Member_E098ADB148DE39DB6D971E48A5676312" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEAustraliaPtyLtd.Member_E098ADB148DE39DB6D971E48A5676312" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEAviationServicesPteLtd.Member" xlink:label="loc_cae_CAEAviationServicesPteLtd.Member_D2E3C42357A522E2C5D21E48A567F422" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEAviationServicesPteLtd.Member_D2E3C42357A522E2C5D21E48A567F422" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEAviationTrainingB.V.Member" xlink:label="loc_cae_CAEAviationTrainingB.V.Member_90D2C4A62F7B01EE34271E48A568D6A3" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEAviationTrainingB.V.Member_90D2C4A62F7B01EE34271E48A568D6A3" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEAviationTrainingChileLimitadaMember" xlink:label="loc_cae_CAEAviationTrainingChileLimitadaMember_2A3C7A68FC3C4FA5AA131E48A568A36A" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEAviationTrainingChileLimitadaMember_2A3C7A68FC3C4FA5AA131E48A568A36A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEAviationTrainingPeruS.A.Member" xlink:label="loc_cae_CAEAviationTrainingPeruS.A.Member_B5A01F0650EB9E8E7A671E48A56865A3" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEAviationTrainingPeruS.A.Member_B5A01F0650EB9E8E7A671E48A56865A3" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEBruneiMultiPurposeTrainingCentreSdnBhdMember" xlink:label="loc_cae_CAEBruneiMultiPurposeTrainingCentreSdnBhdMember_4733E387CD6050849D951E48A5681715" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEBruneiMultiPurposeTrainingCentreSdnBhdMember_4733E387CD6050849D951E48A5681715" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAECenterAmsterdamB.V.Member" xlink:label="loc_cae_CAECenterAmsterdamB.V.Member_97CE7C7C78EE86F21BF11E48A5698A19" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAECenterAmsterdamB.V.Member_97CE7C7C78EE86F21BF11E48A5698A19" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAECenterBrusselsN.V.Member" xlink:label="loc_cae_CAECenterBrusselsN.V.Member_ED61C096BDC6FB951F2D1E48A569E194" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAECenterBrusselsN.V.Member_ED61C096BDC6FB951F2D1E48A569E194" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAECentreCopenhagenASMember" xlink:label="loc_cae_CAECentreCopenhagenASMember_7B2854F66D15F395C49B1E48A569DC6E" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAECentreCopenhagenASMember_7B2854F66D15F395C49B1E48A569DC6E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAECentreHongKongLimitedMember" xlink:label="loc_cae_CAECentreHongKongLimitedMember_E33E9B349618CED1EB401E48A5695779" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAECentreHongKongLimitedMember_E33E9B349618CED1EB401E48A5695779" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAECentreOsloASMember" xlink:label="loc_cae_CAECentreOsloASMember_B012D2A6387F571DF1101E48A56A46B3" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAECentreOsloASMember_B012D2A6387F571DF1101E48A56A46B3" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAECentreStockholmABMember" xlink:label="loc_cae_CAECentreStockholmABMember_1DE80BB297A3510E80F41E48A56A9FB2" xlink:type="locator" />
    <link:definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAECentreStockholmABMember_1DE80BB297A3510E80F41E48A56A9FB2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAECFTB.V.Member" xlink:label="loc_cae_CAECFTB.V.Member_5111F6A525ED92708BB61E48A56A78BA" xlink:type="locator" />
    <link:definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAECFTB.V.Member_5111F6A525ED92708BB61E48A56A78BA" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAECFTKoreaLtd.Member" xlink:label="loc_cae_CAECFTKoreaLtd.Member_BA50B72D75AC4C0D479B1E48A56ACACE" xlink:type="locator" />
    <link:definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAECFTKoreaLtd.Member_BA50B72D75AC4C0D479B1E48A56ACACE" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAECivilAviationTrainingSolutionsInc.Member" xlink:label="loc_cae_CAECivilAviationTrainingSolutionsInc.Member_19E8D334D6E9830983471E48A56AA682" xlink:type="locator" />
    <link:definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAECivilAviationTrainingSolutionsInc.Member_19E8D334D6E9830983471E48A56AA682" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEElectronikGmbHMember" xlink:label="loc_cae_CAEElectronikGmbHMember_DEBF2AAC2ABC86E0D7C21E48A56B2BDB" xlink:type="locator" />
    <link:definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEElectronikGmbHMember_DEBF2AAC2ABC86E0D7C21E48A56B2BDB" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEEurocoS.r.l.Member" xlink:label="loc_cae_CAEEurocoS.r.l.Member_AA29C100CFFFBC25409C1E48A56BA741" xlink:type="locator" />
    <link:definitionArc order="23" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEEurocoS.r.l.Member_AA29C100CFFFBC25409C1E48A56BA741" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEFlightSimulatorServicesSdn.Bhd.Member" xlink:label="loc_cae_CAEFlightSimulatorServicesSdn.Bhd.Member_F14FBFFEA7727FAB855F1E48A56BF854" xlink:type="locator" />
    <link:definitionArc order="24" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEFlightSimulatorServicesSdn.Bhd.Member_F14FBFFEA7727FAB855F1E48A56BF854" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEFlightTrainingCenterMexicoS.A.deC.V.Member" xlink:label="loc_cae_CAEFlightTrainingCenterMexicoS.A.deC.V.Member_B2EAD33A0A195B5A53441E48A56CBA99" xlink:type="locator" />
    <link:definitionArc order="25" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEFlightTrainingCenterMexicoS.A.deC.V.Member_B2EAD33A0A195B5A53441E48A56CBA99" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEGlobalAcademyvoraSAMember" xlink:label="loc_cae_CAEGlobalAcademyvoraSAMember_3A5B323793CDBD16D9B41E48A56C5378" xlink:type="locator" />
    <link:definitionArc order="26" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEGlobalAcademyvoraSAMember_3A5B323793CDBD16D9B41E48A56C5378" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEHealthcareCanadaInc.Member" xlink:label="loc_cae_CAEHealthcareCanadaInc.Member_95BF721A006B260A17D71E48A56CE221" xlink:type="locator" />
    <link:definitionArc order="27" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEHealthcareCanadaInc.Member_95BF721A006B260A17D71E48A56CE221" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEHealthcareInc.Member" xlink:label="loc_cae_CAEHealthcareInc.Member_B6EA2F786BA1FC9377C61E48A56C57AE" xlink:type="locator" />
    <link:definitionArc order="28" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEHealthcareInc.Member_B6EA2F786BA1FC9377C61E48A56C57AE" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEHoldingsLimitedMember" xlink:label="loc_cae_CAEHoldingsLimitedMember_4EB21A0F6DF0338ADBFE1E48A56CC465" xlink:type="locator" />
    <link:definitionArc order="29" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEHoldingsLimitedMember_4EB21A0F6DF0338ADBFE1E48A56CC465" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEIndiaPrivateLimitedMember" xlink:label="loc_cae_CAEIndiaPrivateLimitedMember_9EB032454DDE14BCA6841E48A56D2953" xlink:type="locator" />
    <link:definitionArc order="30" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEIndiaPrivateLimitedMember_9EB032454DDE14BCA6841E48A56D2953" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEIntegratedEnterpriseSolutionsAustraliaPtyLtd.Member" xlink:label="loc_cae_CAEIntegratedEnterpriseSolutionsAustraliaPtyLtd.Member_67E6E7095E3F430FC8E81E48A56D8FE2" xlink:type="locator" />
    <link:definitionArc order="31" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEIntegratedEnterpriseSolutionsAustraliaPtyLtd.Member_67E6E7095E3F430FC8E81E48A56D8FE2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEInternationalHoldingsLimitedMember" xlink:label="loc_cae_CAEInternationalHoldingsLimitedMember_0DA903535A657B2A47271E48A56DB270" xlink:type="locator" />
    <link:definitionArc order="32" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEInternationalHoldingsLimitedMember_0DA903535A657B2A47271E48A56DB270" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAELuxembourgAcquisitionS.r.l.Member" xlink:label="loc_cae_CAELuxembourgAcquisitionS.r.l.Member_5244632FA355B375E6E51E48A56E1AB2" xlink:type="locator" />
    <link:definitionArc order="33" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAELuxembourgAcquisitionS.r.l.Member_5244632FA355B375E6E51E48A56E1AB2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAELuxembourgFinancingS.r.l.Member" xlink:label="loc_cae_CAELuxembourgFinancingS.r.l.Member_18A5F5441AE9676BFFD31E48A56E4071" xlink:type="locator" />
    <link:definitionArc order="34" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAELuxembourgFinancingS.r.l.Member_18A5F5441AE9676BFFD31E48A56E4071" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEMaritimeMiddleEastLLCMember" xlink:label="loc_cae_CAEMaritimeMiddleEastLLCMember_B1F723C077DD0DC29C491E48A56EA37E" xlink:type="locator" />
    <link:definitionArc order="35" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEMaritimeMiddleEastLLCMember_B1F723C077DD0DC29C491E48A56EA37E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEMiddleEastL.L.C.Member" xlink:label="loc_cae_CAEMiddleEastL.L.C.Member_FFB6745D4DB8CA77B0411E48A56EF51A" xlink:type="locator" />
    <link:definitionArc order="36" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEMiddleEastL.L.C.Member_FFB6745D4DB8CA77B0411E48A56EF51A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEMilitaryAviationTrainingInc.Member" xlink:label="loc_cae_CAEMilitaryAviationTrainingInc.Member_28D023928A5B681568781E48A56F1BE8" xlink:type="locator" />
    <link:definitionArc order="37" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEMilitaryAviationTrainingInc.Member_28D023928A5B681568781E48A56F1BE8" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAENewZealandPtyLtd.Member" xlink:label="loc_cae_CAENewZealandPtyLtd.Member_EEBD08F73021F9FF19E01E48A56F9DA0" xlink:type="locator" />
    <link:definitionArc order="38" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAENewZealandPtyLtd.Member_EEBD08F73021F9FF19E01E48A56F9DA0" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAENorthEastTrainingInc.Member" xlink:label="loc_cae_CAENorthEastTrainingInc.Member_4E3CD9B29E6DCE5BB3561E48A56FE6FB" xlink:type="locator" />
    <link:definitionArc order="39" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAENorthEastTrainingInc.Member_4E3CD9B29E6DCE5BB3561E48A56FE6FB" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEOxfordAviationAcademyAmsterdamB.V.Member" xlink:label="loc_cae_CAEOxfordAviationAcademyAmsterdamB.V.Member_D2A65176CC4B75564DBC1E48A56F37A0" xlink:type="locator" />
    <link:definitionArc order="40" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEOxfordAviationAcademyAmsterdamB.V.Member_D2A65176CC4B75564DBC1E48A56F37A0" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEOxfordAviationAcademyPhoenixInc.Member" xlink:label="loc_cae_CAEOxfordAviationAcademyPhoenixInc.Member_5877FC32213D4E61675B1E48A5703173" xlink:type="locator" />
    <link:definitionArc order="41" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEOxfordAviationAcademyPhoenixInc.Member_5877FC32213D4E61675B1E48A5703173" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEServicesItaliaS.r.l.Member" xlink:label="loc_cae_CAEServicesItaliaS.r.l.Member_7CF263D99B0E4E3C82EA1E48A570A861" xlink:type="locator" />
    <link:definitionArc order="42" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEServicesItaliaS.r.l.Member_7CF263D99B0E4E3C82EA1E48A570A861" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEServiciosGlobalesdeInstruccindeVueloEspaaS.L.Member" xlink:label="loc_cae_CAEServiciosGlobalesdeInstruccindeVueloEspaaS.L.Member_AB7FFD8ECBB878F511A71E48A5712F64" xlink:type="locator" />
    <link:definitionArc order="43" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEServiciosGlobalesdeInstruccindeVueloEspaaS.L.Member_AB7FFD8ECBB878F511A71E48A5712F64" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEShanghaiCompanyLimitedMember" xlink:label="loc_cae_CAEShanghaiCompanyLimitedMember_3F2A754BDC2B324C316E1E48A571ED74" xlink:type="locator" />
    <link:definitionArc order="44" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEShanghaiCompanyLimitedMember_3F2A754BDC2B324C316E1E48A571ED74" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAESimuFliteInc.Member" xlink:label="loc_cae_CAESimuFliteInc.Member_419BD5FD618B55CAA3FE1E48A571190B" xlink:type="locator" />
    <link:definitionArc order="45" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAESimuFliteInc.Member_419BD5FD618B55CAA3FE1E48A571190B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAESimulationTechnologiesPrivateLimitedMember" xlink:label="loc_cae_CAESimulationTechnologiesPrivateLimitedMember_BA57D0BD9F718206855E1E48A571AD0A" xlink:type="locator" />
    <link:definitionArc order="46" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAESimulationTechnologiesPrivateLimitedMember_BA57D0BD9F718206855E1E48A571AD0A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAESimulatorServicesInc.Member" xlink:label="loc_cae_CAESimulatorServicesInc.Member_B6FFEC76FBCA8FD2E7B51E48A572E619" xlink:type="locator" />
    <link:definitionArc order="47" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAESimulatorServicesInc.Member_B6FFEC76FBCA8FD2E7B51E48A572E619" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAESingaporeS.E.A.PteLtd.Member" xlink:label="loc_cae_CAESingaporeS.E.A.PteLtd.Member_AC37B66EE265F2111CA11E48A5725A9A" xlink:type="locator" />
    <link:definitionArc order="48" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAESingaporeS.E.A.PteLtd.Member_AC37B66EE265F2111CA11E48A5725A9A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAESouthAmericaFlightTrainingdoBrasilLtda.Member" xlink:label="loc_cae_CAESouthAmericaFlightTrainingdoBrasilLtda.Member_92A6A3AB52462C3842CA1E48A5721194" xlink:type="locator" />
    <link:definitionArc order="49" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAESouthAmericaFlightTrainingdoBrasilLtda.Member_92A6A3AB52462C3842CA1E48A5721194" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAESTSLimitedMember" xlink:label="loc_cae_CAESTSLimitedMember_7E18524673D0510BF4DB1E48A572FC4A" xlink:type="locator" />
    <link:definitionArc order="50" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAESTSLimitedMember_7E18524673D0510BF4DB1E48A572FC4A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAETrainingServicesBrusselsNVMember" xlink:label="loc_cae_CAETrainingServicesBrusselsNVMember_9A6CBAFE4A8BC461ABA91E48A57381F3" xlink:type="locator" />
    <link:definitionArc order="51" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAETrainingServicesBrusselsNVMember_9A6CBAFE4A8BC461ABA91E48A57381F3" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAETrainingServicesUKLtd.Member" xlink:label="loc_cae_CAETrainingServicesUKLtd.Member_0D98AF5437E555DB46821E48A5739793" xlink:type="locator" />
    <link:definitionArc order="52" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAETrainingServicesUKLtd.Member_0D98AF5437E555DB46821E48A5739793" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAETrainingNorwayASMember" xlink:label="loc_cae_CAETrainingNorwayASMember_EB8760E9F266FEF2F3961E48A5737E8E" xlink:type="locator" />
    <link:definitionArc order="53" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAETrainingNorwayASMember_EB8760E9F266FEF2F3961E48A5737E8E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEUSAInc.Member" xlink:label="loc_cae_CAEUSAInc.Member_3771FE271A3CF6DCE4921E48A574C2DC" xlink:type="locator" />
    <link:definitionArc order="54" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEUSAInc.Member_3771FE271A3CF6DCE4921E48A574C2DC" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEVerwaltungsgesellschaftmbHMember" xlink:label="loc_cae_CAEVerwaltungsgesellschaftmbHMember_4898886999F0D4B239B11E48A57457CE" xlink:type="locator" />
    <link:definitionArc order="55" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_CAEVerwaltungsgesellschaftmbHMember_4898886999F0D4B239B11E48A57457CE" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FlightSimulatorCapitalL.P.Member" xlink:label="loc_cae_FlightSimulatorCapitalL.P.Member_5D86BE7ADF253999CE251E48A5742F8C" xlink:type="locator" />
    <link:definitionArc order="56" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_FlightSimulatorCapitalL.P.Member_5D86BE7ADF253999CE251E48A5742F8C" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_OxfordAviationAcademyOxfordLimitedMember" xlink:label="loc_cae_OxfordAviationAcademyOxfordLimitedMember_B52E0EE823973EC3671A1E48A574B77C" xlink:type="locator" />
    <link:definitionArc order="57" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_OxfordAviationAcademyOxfordLimitedMember_B52E0EE823973EC3671A1E48A574B77C" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ParcAviationLimitedMember" xlink:label="loc_cae_ParcAviationLimitedMember_DD920010863CF1C1BE4A1E48A5743CD2" xlink:type="locator" />
    <link:definitionArc order="58" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_ParcAviationLimitedMember_DD920010863CF1C1BE4A1E48A5743CD2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ParcAviationEngineeringServicesLtdMember" xlink:label="loc_cae_ParcAviationEngineeringServicesLtdMember_16F41BDD5E52B9E7CB5E1E48A575D30B" xlink:type="locator" />
    <link:definitionArc order="59" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_ParcAviationEngineeringServicesLtdMember_16F41BDD5E52B9E7CB5E1E48A575D30B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ParcAviationUKLtdMember" xlink:label="loc_cae_ParcAviationUKLtdMember_95C8F73E2A7051905E111E48A5752BD0" xlink:type="locator" />
    <link:definitionArc order="60" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_ParcAviationUKLtdMember_95C8F73E2A7051905E111E48A5752BD0" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ParcInterimLimitedMember" xlink:label="loc_cae_ParcInterimLimitedMember_177F71C4880A13ADD3B61E48A5751E56" xlink:type="locator" />
    <link:definitionArc order="61" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_ParcInterimLimitedMember_177F71C4880A13ADD3B61E48A5751E56" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PresagisCanadaInc.Member" xlink:label="loc_cae_PresagisCanadaInc.Member_F61143FF4B8055A262A21E48A5760FB1" xlink:type="locator" />
    <link:definitionArc order="62" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_PresagisCanadaInc.Member_F61143FF4B8055A262A21E48A5760FB1" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PresagisEuropeS.A.Member" xlink:label="loc_cae_PresagisEuropeS.A.Member_36388CF75570A246E7FD1E48A576AE0B" xlink:type="locator" />
    <link:definitionArc order="63" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_PresagisEuropeS.A.Member_36388CF75570A246E7FD1E48A576AE0B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PresagisUSAInc.Member" xlink:label="loc_cae_PresagisUSAInc.Member_D3F1CEA4B1BF66FEA7631E48A5766BD6" xlink:type="locator" />
    <link:definitionArc order="64" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_PresagisUSAInc.Member_D3F1CEA4B1BF66FEA7631E48A5766BD6" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ServiciosdeInstruccindeVueloS.L.Member" xlink:label="loc_cae_ServiciosdeInstruccindeVueloS.L.Member_167F69F12561F06E1D2F1E48A5762CD4" xlink:type="locator" />
    <link:definitionArc order="65" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_ServiciosdeInstruccindeVueloS.L.Member_167F69F12561F06E1D2F1E48A5762CD4" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SIMIndustriesBrasilAdministracaodeCentrosdeTreinamentoLtda.Member" xlink:label="loc_cae_SIMIndustriesBrasilAdministracaodeCentrosdeTreinamentoLtda.Member_0763F565533AEEB3D5611E48A5772C1C" xlink:type="locator" />
    <link:definitionArc order="66" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_SIMIndustriesBrasilAdministracaodeCentrosdeTreinamentoLtda.Member_0763F565533AEEB3D5611E48A5772C1C" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SIVOpsTrainingS.L.Member" xlink:label="loc_cae_SIVOpsTrainingS.L.Member_249EFEB1E1D48596903E1E48A577FFEA" xlink:type="locator" />
    <link:definitionArc order="67" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForSubsidiariesMember_8731B746511B6096EBF21E48A5647780" xlink:to="loc_cae_SIVOpsTrainingS.L.Member_249EFEB1E1D48596903E1E48A577FFEA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_JointVenturesAxis" xlink:label="loc_ifrs-full_JointVenturesAxis_EB57316ACC06849C0B211E48A5773BF2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_C11424567F2BC98050EC1E48A563E343" xlink:to="loc_ifrs-full_JointVenturesAxis_EB57316ACC06849C0B211E48A5773BF2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForJointVenturesMember" xlink:label="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_JointVenturesAxis_EB57316ACC06849C0B211E48A5773BF2" xlink:to="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForJointVenturesMember" xlink:label="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_JointVenturesAxis_EB57316ACC06849C0B211E48A5773BF2" xlink:to="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AsianAviationCentreofExcellenceSdn.Bhd.Member" xlink:label="loc_cae_AsianAviationCentreofExcellenceSdn.Bhd.Member_CD44BCA793F9873A91721E48A578D2BA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_AsianAviationCentreofExcellenceSdn.Bhd.Member_CD44BCA793F9873A91721E48A578D2BA" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEUKplcMember" xlink:label="loc_cae_CAEUKplcMember_4349E6B5B61CB4BDEA1E1E48A5794BB4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEUKplcMember_4349E6B5B61CB4BDEA1E1E48A5794BB4" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEUSInc.Member" xlink:label="loc_cae_CAEUSInc.Member_F9239E8CBF2CDA10C5A61E48A5795E46" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEUSInc.Member_F9239E8CBF2CDA10C5A61E48A5795E46" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEAircrewTrainingServicesplcMember" xlink:label="loc_cae_CAEAircrewTrainingServicesplcMember_F5C7BDEF0D948963FF211E48A579DD8B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEAircrewTrainingServicesplcMember_F5C7BDEF0D948963FF211E48A579DD8B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEAustraliaPtyLtd.Member" xlink:label="loc_cae_CAEAustraliaPtyLtd.Member_30B52E2C7238F9D3956B1E48A57A0052" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEAustraliaPtyLtd.Member_30B52E2C7238F9D3956B1E48A57A0052" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEAviationServicesPteLtd.Member" xlink:label="loc_cae_CAEAviationServicesPteLtd.Member_27BBB86F701D0C332AEF1E48A57AEB3E" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEAviationServicesPteLtd.Member_27BBB86F701D0C332AEF1E48A57AEB3E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEAviationTrainingB.V.Member" xlink:label="loc_cae_CAEAviationTrainingB.V.Member_F7B67E213B7634B96E411E48A57B67B7" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEAviationTrainingB.V.Member_F7B67E213B7634B96E411E48A57B67B7" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEAviationTrainingChileLimitadaMember" xlink:label="loc_cae_CAEAviationTrainingChileLimitadaMember_9279087AD2418A5B27641E48A57BCB40" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEAviationTrainingChileLimitadaMember_9279087AD2418A5B27641E48A57BCB40" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEAviationTrainingPeruS.A.Member" xlink:label="loc_cae_CAEAviationTrainingPeruS.A.Member_9655680C896D4DBF23F41E48A57B776D" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEAviationTrainingPeruS.A.Member_9655680C896D4DBF23F41E48A57B776D" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEBruneiMultiPurposeTrainingCentreSdnBhdMember" xlink:label="loc_cae_CAEBruneiMultiPurposeTrainingCentreSdnBhdMember_0CE230DE1EE66F8685681E48A57CA53F" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEBruneiMultiPurposeTrainingCentreSdnBhdMember_0CE230DE1EE66F8685681E48A57CA53F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAECenterAmsterdamB.V.Member" xlink:label="loc_cae_CAECenterAmsterdamB.V.Member_3EADC0D3FD016444D0AF1E48A57C042C" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAECenterAmsterdamB.V.Member_3EADC0D3FD016444D0AF1E48A57C042C" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAECenterBrusselsN.V.Member" xlink:label="loc_cae_CAECenterBrusselsN.V.Member_CDD5219AF64284E4B32B1E48A57C1423" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAECenterBrusselsN.V.Member_CDD5219AF64284E4B32B1E48A57C1423" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAECentreCopenhagenASMember" xlink:label="loc_cae_CAECentreCopenhagenASMember_F2C758E83049B55889111E48A57CDA8E" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAECentreCopenhagenASMember_F2C758E83049B55889111E48A57CDA8E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAECentreHongKongLimitedMember" xlink:label="loc_cae_CAECentreHongKongLimitedMember_40FC71B97BFB6BC66A1C1E48A57D930F" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAECentreHongKongLimitedMember_40FC71B97BFB6BC66A1C1E48A57D930F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAECentreOsloASMember" xlink:label="loc_cae_CAECentreOsloASMember_CE2E64119D53093F3E761E48A57D4590" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAECentreOsloASMember_CE2E64119D53093F3E761E48A57D4590" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAECentreStockholmABMember" xlink:label="loc_cae_CAECentreStockholmABMember_3F97046668BC14F933E91E48A57D91DB" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAECentreStockholmABMember_3F97046668BC14F933E91E48A57D91DB" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAECFTB.V.Member" xlink:label="loc_cae_CAECFTB.V.Member_8349B4BCF208E04D20BE1E48A57E02A1" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAECFTB.V.Member_8349B4BCF208E04D20BE1E48A57E02A1" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAECFTKoreaLtd.Member" xlink:label="loc_cae_CAECFTKoreaLtd.Member_A019D6830496D74F8A2E1E48A57E512F" xlink:type="locator" />
    <link:definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAECFTKoreaLtd.Member_A019D6830496D74F8A2E1E48A57E512F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAECivilAviationTrainingSolutionsInc.Member" xlink:label="loc_cae_CAECivilAviationTrainingSolutionsInc.Member_E34F1B92B1CCE3FD86111E48A57E4639" xlink:type="locator" />
    <link:definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAECivilAviationTrainingSolutionsInc.Member_E34F1B92B1CCE3FD86111E48A57E4639" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEDelawareBuycoInc.Member" xlink:label="loc_cae_CAEDelawareBuycoInc.Member_89440A7320A22B6270DE1E48A57E5050" xlink:type="locator" />
    <link:definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEDelawareBuycoInc.Member_89440A7320A22B6270DE1E48A57E5050" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEElectronikGmbHMember" xlink:label="loc_cae_CAEElectronikGmbHMember_F7FCBECD9A9E46300D271E48A57E6484" xlink:type="locator" />
    <link:definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEElectronikGmbHMember_F7FCBECD9A9E46300D271E48A57E6484" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEEurocoS.r.l.Member" xlink:label="loc_cae_CAEEurocoS.r.l.Member_3FC4825C36FF74A4390E1E48A57F95CA" xlink:type="locator" />
    <link:definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEEurocoS.r.l.Member_3FC4825C36FF74A4390E1E48A57F95CA" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEFlightSimulatorServicesSdn.Bhd.Member" xlink:label="loc_cae_CAEFlightSimulatorServicesSdn.Bhd.Member_7F0D29095C598A01E5821E48A57FF59F" xlink:type="locator" />
    <link:definitionArc order="23" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEFlightSimulatorServicesSdn.Bhd.Member_7F0D29095C598A01E5821E48A57FF59F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEFlightTrainingCenterMexicoS.A.deC.V.Member" xlink:label="loc_cae_CAEFlightTrainingCenterMexicoS.A.deC.V.Member_B2A5F5DECBB3C04B992E1E48A57FFC4B" xlink:type="locator" />
    <link:definitionArc order="24" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEFlightTrainingCenterMexicoS.A.deC.V.Member_B2A5F5DECBB3C04B992E1E48A57FFC4B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEGlobalAcademyvoraSAMember" xlink:label="loc_cae_CAEGlobalAcademyvoraSAMember_09D110BA51829127E7321E48A580358B" xlink:type="locator" />
    <link:definitionArc order="25" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEGlobalAcademyvoraSAMember_09D110BA51829127E7321E48A580358B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEHealthcareCanadaInc.Member" xlink:label="loc_cae_CAEHealthcareCanadaInc.Member_D3AEC6AEE8BC6F13FCC41E48A58004B0" xlink:type="locator" />
    <link:definitionArc order="26" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEHealthcareCanadaInc.Member_D3AEC6AEE8BC6F13FCC41E48A58004B0" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEHealthcareInc.Member" xlink:label="loc_cae_CAEHealthcareInc.Member_15D0B4A6304ECB6ABC971E48A580009E" xlink:type="locator" />
    <link:definitionArc order="27" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEHealthcareInc.Member_15D0B4A6304ECB6ABC971E48A580009E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEHoldingsLimitedMember" xlink:label="loc_cae_CAEHoldingsLimitedMember_70C4A85759417DD687511E48A581987D" xlink:type="locator" />
    <link:definitionArc order="28" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEHoldingsLimitedMember_70C4A85759417DD687511E48A581987D" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEIndiaPrivateLimitedMember" xlink:label="loc_cae_CAEIndiaPrivateLimitedMember_ED34CC37AAE06FA959591E48A58171E3" xlink:type="locator" />
    <link:definitionArc order="29" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEIndiaPrivateLimitedMember_ED34CC37AAE06FA959591E48A58171E3" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEIntegratedEnterpriseSolutionsAustraliaPtyLtd.Member" xlink:label="loc_cae_CAEIntegratedEnterpriseSolutionsAustraliaPtyLtd.Member_4B1FC148634DFB6649671E48A581C9B0" xlink:type="locator" />
    <link:definitionArc order="30" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEIntegratedEnterpriseSolutionsAustraliaPtyLtd.Member_4B1FC148634DFB6649671E48A581C9B0" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEInternationalHoldingsLimitedMember" xlink:label="loc_cae_CAEInternationalHoldingsLimitedMember_608CC56CD5A52BCCB2851E48A5817E84" xlink:type="locator" />
    <link:definitionArc order="31" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEInternationalHoldingsLimitedMember_608CC56CD5A52BCCB2851E48A5817E84" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEInvestmentsS.r.l.Member" xlink:label="loc_cae_CAEInvestmentsS.r.l.Member_1FB755AB401F1F8239B11E48A582DEAB" xlink:type="locator" />
    <link:definitionArc order="32" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEInvestmentsS.r.l.Member_1FB755AB401F1F8239B11E48A582DEAB" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAELuxembourgAcquisitionS.r.l.Member" xlink:label="loc_cae_CAELuxembourgAcquisitionS.r.l.Member_D6BC9D3C3347AB8999561E48A5829377" xlink:type="locator" />
    <link:definitionArc order="33" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAELuxembourgAcquisitionS.r.l.Member_D6BC9D3C3347AB8999561E48A5829377" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAELuxembourgFinancingS.r.l.Member" xlink:label="loc_cae_CAELuxembourgFinancingS.r.l.Member_22DA7F19B18339077C321E48A583B17E" xlink:type="locator" />
    <link:definitionArc order="34" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAELuxembourgFinancingS.r.l.Member_22DA7F19B18339077C321E48A583B17E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEManagementLuxembourgS.r.l.Member" xlink:label="loc_cae_CAEManagementLuxembourgS.r.l.Member_DD8E5DF631E60BC0B9021E48A58346A1" xlink:type="locator" />
    <link:definitionArc order="35" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEManagementLuxembourgS.r.l.Member_DD8E5DF631E60BC0B9021E48A58346A1" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEMaritimeMiddleEastLLCMember" xlink:label="loc_cae_CAEMaritimeMiddleEastLLCMember_4CEF36E230AEC438B5AC1E48A58383D7" xlink:type="locator" />
    <link:definitionArc order="36" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEMaritimeMiddleEastLLCMember_4CEF36E230AEC438B5AC1E48A58383D7" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEMiddleEastL.L.C.Member" xlink:label="loc_cae_CAEMiddleEastL.L.C.Member_4BA7885618C185100B311E48A583D87E" xlink:type="locator" />
    <link:definitionArc order="37" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEMiddleEastL.L.C.Member_4BA7885618C185100B311E48A583D87E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEMilitaryAviationTrainingInc.Member" xlink:label="loc_cae_CAEMilitaryAviationTrainingInc.Member_E026EBAF77D1133D89801E48A584E15F" xlink:type="locator" />
    <link:definitionArc order="38" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEMilitaryAviationTrainingInc.Member_E026EBAF77D1133D89801E48A584E15F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAENewZealandPtyLtd.Member" xlink:label="loc_cae_CAENewZealandPtyLtd.Member_1BB2283404B17C46CDE81E48A5843436" xlink:type="locator" />
    <link:definitionArc order="39" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAENewZealandPtyLtd.Member_1BB2283404B17C46CDE81E48A5843436" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAENorthEastTrainingInc.Member" xlink:label="loc_cae_CAENorthEastTrainingInc.Member_50E68852324503C9C8C41E48A58445EA" xlink:type="locator" />
    <link:definitionArc order="40" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAENorthEastTrainingInc.Member_50E68852324503C9C8C41E48A58445EA" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEOxfordAviationAcademyPhoenixInc.Member" xlink:label="loc_cae_CAEOxfordAviationAcademyPhoenixInc.Member_0C17A9128DDDC752350F1E48A584A5B2" xlink:type="locator" />
    <link:definitionArc order="41" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEOxfordAviationAcademyPhoenixInc.Member_0C17A9128DDDC752350F1E48A584A5B2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEServicesItaliaS.r.l.Member" xlink:label="loc_cae_CAEServicesItaliaS.r.l.Member_AD12C3FA7B56594794E71E48A585F340" xlink:type="locator" />
    <link:definitionArc order="42" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEServicesItaliaS.r.l.Member_AD12C3FA7B56594794E71E48A585F340" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEServiciosGlobalesdeInstruccindeVueloEspaaS.L.Member" xlink:label="loc_cae_CAEServiciosGlobalesdeInstruccindeVueloEspaaS.L.Member_FCE3C7508CFE65486E191E48A585B07D" xlink:type="locator" />
    <link:definitionArc order="43" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEServiciosGlobalesdeInstruccindeVueloEspaaS.L.Member_FCE3C7508CFE65486E191E48A585B07D" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEShanghaiCompanyLimitedMember" xlink:label="loc_cae_CAEShanghaiCompanyLimitedMember_79095E2C890E01056FE31E48A5863ED7" xlink:type="locator" />
    <link:definitionArc order="44" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEShanghaiCompanyLimitedMember_79095E2C890E01056FE31E48A5863ED7" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAESimuFliteInc.Member" xlink:label="loc_cae_CAESimuFliteInc.Member_9232C46AA3B2C0FD72B41E48A586A01E" xlink:type="locator" />
    <link:definitionArc order="45" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAESimuFliteInc.Member_9232C46AA3B2C0FD72B41E48A586A01E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAESimulationTechnologiesPrivateLimitedMember" xlink:label="loc_cae_CAESimulationTechnologiesPrivateLimitedMember_73D59B2A0DD79D0E6BF61E48A5868D12" xlink:type="locator" />
    <link:definitionArc order="46" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAESimulationTechnologiesPrivateLimitedMember_73D59B2A0DD79D0E6BF61E48A5868D12" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAESimulatorServicesInc.Member" xlink:label="loc_cae_CAESimulatorServicesInc.Member_AECEB923095B06204A331E48A587A8E6" xlink:type="locator" />
    <link:definitionArc order="47" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAESimulatorServicesInc.Member_AECEB923095B06204A331E48A587A8E6" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAESingaporeS.E.A.PteLtd.Member" xlink:label="loc_cae_CAESingaporeS.E.A.PteLtd.Member_4281540CEA09A553BE631E48A587BBEF" xlink:type="locator" />
    <link:definitionArc order="48" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAESingaporeS.E.A.PteLtd.Member_4281540CEA09A553BE631E48A587BBEF" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAESouthAmericaFlightTrainingdoBrasilLtda.Member" xlink:label="loc_cae_CAESouthAmericaFlightTrainingdoBrasilLtda.Member_43AD090945949E6582BE1E48A587267E" xlink:type="locator" />
    <link:definitionArc order="49" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAESouthAmericaFlightTrainingdoBrasilLtda.Member_43AD090945949E6582BE1E48A587267E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAESTSLimitedMember" xlink:label="loc_cae_CAESTSLimitedMember_C6C4FDB622D7A354AC721E48A5875373" xlink:type="locator" />
    <link:definitionArc order="50" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAESTSLimitedMember_C6C4FDB622D7A354AC721E48A5875373" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAETrainingServicesBrusselsNVMember" xlink:label="loc_cae_CAETrainingServicesBrusselsNVMember_202DE1CFE7772CD795891E48A5886F2F" xlink:type="locator" />
    <link:definitionArc order="51" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAETrainingServicesBrusselsNVMember_202DE1CFE7772CD795891E48A5886F2F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAETrainingServicesUKLtd.Member" xlink:label="loc_cae_CAETrainingServicesUKLtd.Member_5971DBC82E3ED81DB37D1E48A58948FC" xlink:type="locator" />
    <link:definitionArc order="52" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAETrainingServicesUKLtd.Member_5971DBC82E3ED81DB37D1E48A58948FC" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAETrainingNorwayASMember" xlink:label="loc_cae_CAETrainingNorwayASMember_D516D3C9065BA393993D1E48A589699F" xlink:type="locator" />
    <link:definitionArc order="53" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAETrainingNorwayASMember_D516D3C9065BA393993D1E48A589699F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEUSAInc.Member" xlink:label="loc_cae_CAEUSAInc.Member_B08883CABADF18285FAA1E48A5899865" xlink:type="locator" />
    <link:definitionArc order="54" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEUSAInc.Member_B08883CABADF18285FAA1E48A5899865" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEVerwaltungsgesellschaftmbHMember" xlink:label="loc_cae_CAEVerwaltungsgesellschaftmbHMember_35263B5F948208E1D2A81E48A589ACD0" xlink:type="locator" />
    <link:definitionArc order="55" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEVerwaltungsgesellschaftmbHMember_35263B5F948208E1D2A81E48A589ACD0" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FlightSimulatorCapitalL.P.Member" xlink:label="loc_cae_FlightSimulatorCapitalL.P.Member_E5AE7DDEA81898859D5C1E48A58A93CC" xlink:type="locator" />
    <link:definitionArc order="56" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_FlightSimulatorCapitalL.P.Member_E5AE7DDEA81898859D5C1E48A58A93CC" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_OxfordAviationAcademyOxfordLimitedMember" xlink:label="loc_cae_OxfordAviationAcademyOxfordLimitedMember_D967CF058A19385D53711E48A58A1AA8" xlink:type="locator" />
    <link:definitionArc order="57" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_OxfordAviationAcademyOxfordLimitedMember_D967CF058A19385D53711E48A58A1AA8" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ParcAviationLimitedMember" xlink:label="loc_cae_ParcAviationLimitedMember_705341693078A9021E3C1E48A58A31EC" xlink:type="locator" />
    <link:definitionArc order="58" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_ParcAviationLimitedMember_705341693078A9021E3C1E48A58A31EC" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ParcInterimLimitedMember" xlink:label="loc_cae_ParcInterimLimitedMember_9A944CCFC8615B6848EE1E48A58A8384" xlink:type="locator" />
    <link:definitionArc order="59" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_ParcInterimLimitedMember_9A944CCFC8615B6848EE1E48A58A8384" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PresagisCanadaInc.Member" xlink:label="loc_cae_PresagisCanadaInc.Member_B123EDA6CD4F643F267B1E48A58B7557" xlink:type="locator" />
    <link:definitionArc order="60" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_PresagisCanadaInc.Member_B123EDA6CD4F643F267B1E48A58B7557" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PresagisEuropeS.A.Member" xlink:label="loc_cae_PresagisEuropeS.A.Member_C6D411C44E057AED9BE51E48A58BB848" xlink:type="locator" />
    <link:definitionArc order="61" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_PresagisEuropeS.A.Member_C6D411C44E057AED9BE51E48A58BB848" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PresagisUSAInc.Member" xlink:label="loc_cae_PresagisUSAInc.Member_385C24E9C1050D6BD7AD1E48A58CB97C" xlink:type="locator" />
    <link:definitionArc order="62" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_PresagisUSAInc.Member_385C24E9C1050D6BD7AD1E48A58CB97C" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ServiciosdeInstruccindeVueloS.L.Member" xlink:label="loc_cae_ServiciosdeInstruccindeVueloS.L.Member_05D7F8C272998D1A0E711E48A58CC890" xlink:type="locator" />
    <link:definitionArc order="63" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_ServiciosdeInstruccindeVueloS.L.Member_05D7F8C272998D1A0E711E48A58CC890" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SIMIndustriesBrasilAdministracaodeCentrosdeTreinamentoLtda.Member" xlink:label="loc_cae_SIMIndustriesBrasilAdministracaodeCentrosdeTreinamentoLtda.Member_ECAAC8F91FDC4823A3021E48A58CE55F" xlink:type="locator" />
    <link:definitionArc order="64" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_SIMIndustriesBrasilAdministracaodeCentrosdeTreinamentoLtda.Member_ECAAC8F91FDC4823A3021E48A58CE55F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SIVOpsTrainingS.L.Member" xlink:label="loc_cae_SIVOpsTrainingS.L.Member_E9FA2985B85599B73C191E48A58CC81A" xlink:type="locator" />
    <link:definitionArc order="65" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_SIVOpsTrainingS.L.Member_E9FA2985B85599B73C191E48A58CC81A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AviationTrainingNortheastAsiaB.V.Member" xlink:label="loc_cae_AviationTrainingNortheastAsiaB.V.Member_FE5D3BC7A1FBCC1B94631E48A58C5859" xlink:type="locator" />
    <link:definitionArc order="66" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_AviationTrainingNortheastAsiaB.V.Member_FE5D3BC7A1FBCC1B94631E48A58C5859" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEFlightandSimulatorServicesKoreaLtd.Member" xlink:label="loc_cae_CAEFlightandSimulatorServicesKoreaLtd.Member_8B01B833A4A55AD9AD051E48A58DE5BF" xlink:type="locator" />
    <link:definitionArc order="67" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEFlightandSimulatorServicesKoreaLtd.Member_8B01B833A4A55AD9AD051E48A58DE5BF" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEFlightTrainingIndiaPrivateLimitedMember" xlink:label="loc_cae_CAEFlightTrainingIndiaPrivateLimitedMember_9F43140B6185AABDB04E1E48A58D11FE" xlink:type="locator" />
    <link:definitionArc order="68" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEFlightTrainingIndiaPrivateLimitedMember_9F43140B6185AABDB04E1E48A58D11FE" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAELIDERTrainingdoBrasilLtda.Member" xlink:label="loc_cae_CAELIDERTrainingdoBrasilLtda.Member_D90140624030A8F099851E48A58D55C0" xlink:type="locator" />
    <link:definitionArc order="69" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAELIDERTrainingdoBrasilLtda.Member_D90140624030A8F099851E48A58D55C0" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CAEMelbourneFlightTrainingPtyLtd.Member" xlink:label="loc_cae_CAEMelbourneFlightTrainingPtyLtd.Member_20B894951A1A7133EE111E48A58EB6B9" xlink:type="locator" />
    <link:definitionArc order="70" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_CAEMelbourneFlightTrainingPtyLtd.Member_20B894951A1A7133EE111E48A58EB6B9" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ChinaSouthernWestAustraliaFlyingCollegePtyLtd.Member" xlink:label="loc_cae_ChinaSouthernWestAustraliaFlyingCollegePtyLtd.Member_E6FF87F15715D26D63B21E48A58E6963" xlink:type="locator" />
    <link:definitionArc order="71" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_ChinaSouthernWestAustraliaFlyingCollegePtyLtd.Member_E6FF87F15715D26D63B21E48A58E6963" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EmbraerCAETrainingServicesLLCMember" xlink:label="loc_cae_EmbraerCAETrainingServicesLLCMember_8DB9E5820A74C10B50BD1E48A58E3113" xlink:type="locator" />
    <link:definitionArc order="72" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_EmbraerCAETrainingServicesLLCMember_8DB9E5820A74C10B50BD1E48A58E3113" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EmiratesCAEFlightTrainingLLCMember" xlink:label="loc_cae_EmiratesCAEFlightTrainingLLCMember_CB8EDD489BEA736CCAF81E48A58EDE30" xlink:type="locator" />
    <link:definitionArc order="73" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_EmiratesCAEFlightTrainingLLCMember_CB8EDD489BEA736CCAF81E48A58EDE30" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FlightTrainingAllianceGmbHJVMember" xlink:label="loc_cae_FlightTrainingAllianceGmbHJVMember_1E9BA9FC08547CBF4C0C1E48A58F97BC" xlink:type="locator" />
    <link:definitionArc order="74" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_FlightTrainingAllianceGmbHJVMember_1E9BA9FC08547CBF4C0C1E48A58F97BC" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_HATSOFFHelicopterTrainingPrivateLimitedMember" xlink:label="loc_cae_HATSOFFHelicopterTrainingPrivateLimitedMember_7231326E80E8535A0DBC1E48A58FA4EA" xlink:type="locator" />
    <link:definitionArc order="75" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_HATSOFFHelicopterTrainingPrivateLimitedMember_7231326E80E8535A0DBC1E48A58FA4EA" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_HFTSHelicopterFlightTrainingServicesGmbHMember" xlink:label="loc_cae_HFTSHelicopterFlightTrainingServicesGmbHMember_8B9EE43B38BE9413C4C01E48A58FC4EE" xlink:type="locator" />
    <link:definitionArc order="76" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_HFTSHelicopterFlightTrainingServicesGmbHMember_8B9EE43B38BE9413C4C01E48A58FC4EE" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_JALCAEFlightTrainingCo.Ltd.Member" xlink:label="loc_cae_JALCAEFlightTrainingCo.Ltd.Member_8AA46E4E0AC3CABD77A51E48A5902EEE" xlink:type="locator" />
    <link:definitionArc order="77" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_JALCAEFlightTrainingCo.Ltd.Member_8AA46E4E0AC3CABD77A51E48A5902EEE" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NationalFlyingTrainingInstitutePrivateLimitedMember" xlink:label="loc_cae_NationalFlyingTrainingInstitutePrivateLimitedMember_6A0B14285EFEC39B974E1E48A590298C" xlink:type="locator" />
    <link:definitionArc order="78" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_NationalFlyingTrainingInstitutePrivateLimitedMember_6A0B14285EFEC39B974E1E48A590298C" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PegasusUcusEgitimMerkeziA.S.Member" xlink:label="loc_cae_PegasusUcusEgitimMerkeziA.S.Member_CD79B917FE44B4A8BC1A1E48A5908BE6" xlink:type="locator" />
    <link:definitionArc order="79" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_PegasusUcusEgitimMerkeziA.S.Member_CD79B917FE44B4A8BC1A1E48A5908BE6" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PelesysLearningSystemsInc.Member" xlink:label="loc_cae_PelesysLearningSystemsInc.Member_7AFE50AC88F1AF325F8D1E48A590AEF7" xlink:type="locator" />
    <link:definitionArc order="80" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_PelesysLearningSystemsInc.Member_7AFE50AC88F1AF325F8D1E48A590AEF7" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PhilippineAcademyofAviationTrainingMember" xlink:label="loc_cae_PhilippineAcademyofAviationTrainingMember_4AAC1251C777026371511E48A5911F03" xlink:type="locator" />
    <link:definitionArc order="81" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_PhilippineAcademyofAviationTrainingMember_4AAC1251C777026371511E48A5911F03" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_Rotorsims.r.l.Member" xlink:label="loc_cae_Rotorsims.r.l.Member_CB755A30A96772BB930D1E48A5917DEB" xlink:type="locator" />
    <link:definitionArc order="82" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_Rotorsims.r.l.Member_CB755A30A96772BB930D1E48A5917DEB" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_RotorsimUSALLCMember" xlink:label="loc_cae_RotorsimUSALLCMember_463C2BBE09121056995E1E48A591CEB9" xlink:type="locator" />
    <link:definitionArc order="83" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_RotorsimUSALLCMember_463C2BBE09121056995E1E48A591CEB9" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ZhuhaiFreeTradeZoneXiangYiAviationTechnologyCompanyLimitedMember" xlink:label="loc_cae_ZhuhaiFreeTradeZoneXiangYiAviationTechnologyCompanyLimitedMember_7B641D91B399A5587C4A1E48A591F91E" xlink:type="locator" />
    <link:definitionArc order="84" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_ZhuhaiFreeTradeZoneXiangYiAviationTechnologyCompanyLimitedMember_7B641D91B399A5587C4A1E48A591F91E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ZhuhaiXiangYiAviationTechnologyCompanyLimitedMember" xlink:label="loc_cae_ZhuhaiXiangYiAviationTechnologyCompanyLimitedMember_52F93701CCF49FD07C1D1E48A59232CC" xlink:type="locator" />
    <link:definitionArc order="85" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForJointVenturesMember_FA9D0F6268C97D7378851E48A57849CA" xlink:to="loc_cae_ZhuhaiXiangYiAviationTechnologyCompanyLimitedMember_52F93701CCF49FD07C1D1E48A59232CC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProportionOfOwnershipInterestInSubsidiary" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_8DA4A2E5B3B743D225091E48A592FC1E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_0D73678ECA655570D9121E48A59262C6" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_8DA4A2E5B3B743D225091E48A592FC1E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ProportionOfOwnershipInterestInJointVenture" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInJointVenture_24EDBC95A84A7174BF751E48A59382AF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_0D73678ECA655570D9121E48A59262C6" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInJointVenture_24EDBC95A84A7174BF751E48A59382AF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PercentageOfVotingEquityInterestsAcquired" xlink:label="loc_ifrs-full_PercentageOfVotingEquityInterestsAcquired_D72F0A23998D83251FB61E48A593929C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_0D73678ECA655570D9121E48A59262C6" xlink:to="loc_ifrs-full_PercentageOfVotingEquityInterestsAcquired_D72F0A23998D83251FB61E48A593929C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherCashPaymentsToAcquireInterestsInJointVenturesClassifiedAsInvestingActivities" xlink:label="loc_ifrs-full_OtherCashPaymentsToAcquireInterestsInJointVenturesClassifiedAsInvestingActivities_6D8B369721A20753A3EF1E48A59349A3" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_0D73678ECA655570D9121E48A59262C6" xlink:to="loc_ifrs-full_OtherCashPaymentsToAcquireInterestsInJointVenturesClassifiedAsInvestingActivities_6D8B369721A20753A3EF1E48A59349A3" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ProportionOfOwnershipInterestInJointVentureHeldByCoVenturer" xlink:label="loc_cae_ProportionOfOwnershipInterestInJointVentureHeldByCoVenturer_477285C3A73ED59428651E48A593AD78" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_0D73678ECA655570D9121E48A59262C6" xlink:to="loc_cae_ProportionOfOwnershipInterestInJointVentureHeldByCoVenturer_477285C3A73ED59428651E48A593AD78" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_UnrecognisedShareOfLossesOfJointVentures" xlink:label="loc_ifrs-full_UnrecognisedShareOfLossesOfJointVentures_91A64460F474E20F770B1E671FB3B519" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_0D73678ECA655570D9121E48A59262C6" xlink:to="loc_ifrs-full_UnrecognisedShareOfLossesOfJointVentures_91A64460F474E20F770B1E671FB3B519" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CumulativeUnrecognisedShareOfLossesOfJointVentures" xlink:label="loc_ifrs-full_CumulativeUnrecognisedShareOfLossesOfJointVentures_04EBF6A72F8B85BED7951E48A59418CA" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_0D73678ECA655570D9121E48A59262C6" xlink:to="loc_ifrs-full_CumulativeUnrecognisedShareOfLossesOfJointVentures_04EBF6A72F8B85BED7951E48A59418CA" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CumulativeUnrecognisedShareOfComprehensiveLossesofJointVentures" xlink:label="loc_cae_CumulativeUnrecognisedShareOfComprehensiveLossesofJointVentures_192E460037BE4D96AE9C1E48A59508CB" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_0D73678ECA655570D9121E48A59262C6" xlink:to="loc_cae_CumulativeUnrecognisedShareOfComprehensiveLossesofJointVentures_192E460037BE4D96AE9C1E48A59508CB" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/RelatedPartyRelationshipsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/RelatedPartyTransactions" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/RelatedPartyTransactionsCompensationOfKeyManagementPersonnelDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/RelatedPartyTransactionsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:label="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_3F55B581B4232F4F9AC4F2CCB7E97516" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable" xlink:label="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_B4B43862FA4C3441D141F2CCB7E84D98" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_3F55B581B4232F4F9AC4F2CCB7E97516" xlink:to="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_B4B43862FA4C3441D141F2CCB7E84D98" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_38C4FE29AEAF0833797EF2CCB7E857AC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_B4B43862FA4C3441D141F2CCB7E84D98" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_38C4FE29AEAF0833797EF2CCB7E857AC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:label="loc_ifrs-full_EntitysTotalForRelatedPartiesMember_E0579F5C744994601818F2CCB7E80627_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_38C4FE29AEAF0833797EF2CCB7E857AC" xlink:to="loc_ifrs-full_EntitysTotalForRelatedPartiesMember_E0579F5C744994601818F2CCB7E80627_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:label="loc_ifrs-full_EntitysTotalForRelatedPartiesMember_E0579F5C744994601818F2CCB7E80627" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_38C4FE29AEAF0833797EF2CCB7E857AC" xlink:to="loc_ifrs-full_EntitysTotalForRelatedPartiesMember_E0579F5C744994601818F2CCB7E80627" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_JointVenturesMember" xlink:label="loc_ifrs-full_JointVenturesMember_F1BFDD368AB1F1F8D88EF2CCB7E8A5D0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForRelatedPartiesMember_E0579F5C744994601818F2CCB7E80627" xlink:to="loc_ifrs-full_JointVenturesMember_F1BFDD368AB1F1F8D88EF2CCB7E8A5D0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_OtherRelatedPartiesMember" xlink:label="loc_ifrs-full_OtherRelatedPartiesMember_1D85810BFC9CB5353077F2CCB7E8BE84" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForRelatedPartiesMember_E0579F5C744994601818F2CCB7E80627" xlink:to="loc_ifrs-full_OtherRelatedPartiesMember_1D85810BFC9CB5353077F2CCB7E8BE84" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfInterestRatesAxis" xlink:label="loc_ifrs-full_TypesOfInterestRatesAxis_B835C897F2D40A5021F0F2CCB7E93F3C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_B4B43862FA4C3441D141F2CCB7E84D98" xlink:to="loc_ifrs-full_TypesOfInterestRatesAxis_B835C897F2D40A5021F0F2CCB7E93F3C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InterestRateTypesMember" xlink:label="loc_ifrs-full_InterestRateTypesMember_62AC1819D4590FD6C42DF2CCB7E90D41_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfInterestRatesAxis_B835C897F2D40A5021F0F2CCB7E93F3C" xlink:to="loc_ifrs-full_InterestRateTypesMember_62AC1819D4590FD6C42DF2CCB7E90D41_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_InterestRateTypesMember" xlink:label="loc_ifrs-full_InterestRateTypesMember_62AC1819D4590FD6C42DF2CCB7E90D41" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfInterestRatesAxis_B835C897F2D40A5021F0F2CCB7E93F3C" xlink:to="loc_ifrs-full_InterestRateTypesMember_62AC1819D4590FD6C42DF2CCB7E90D41" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FixedInterestRateMember" xlink:label="loc_ifrs-full_FixedInterestRateMember_E2123F47CDDD20E89667F2CCB7E956D0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_InterestRateTypesMember_62AC1819D4590FD6C42DF2CCB7E90D41" xlink:to="loc_ifrs-full_FixedInterestRateMember_E2123F47CDDD20E89667F2CCB7E956D0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinanceLeaseReceivables" xlink:label="loc_ifrs-full_FinanceLeaseReceivables_3EF00A33CD706F9F4DA1F2CCB7E9E32B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_3F55B581B4232F4F9AC4F2CCB7E97516" xlink:to="loc_ifrs-full_FinanceLeaseReceivables_3EF00A33CD706F9F4DA1F2CCB7E9E32B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_Financeleasereceivableinterestrate" xlink:label="loc_cae_Financeleasereceivableinterestrate_8D42628A70BADFC7670CF2CCB7E93DCA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_3F55B581B4232F4F9AC4F2CCB7E97516" xlink:to="loc_cae_Financeleasereceivableinterestrate_8D42628A70BADFC7670CF2CCB7E93DCA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LoansAndReceivables" xlink:label="loc_ifrs-full_LoansAndReceivables_EEA97876201A2F9D67ADF2CCB7E96127" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_3F55B581B4232F4F9AC4F2CCB7E97516" xlink:to="loc_ifrs-full_LoansAndReceivables_EEA97876201A2F9D67ADF2CCB7E96127" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_Loansandreceivablesinterestrate" xlink:label="loc_cae_Loansandreceivablesinterestrate_A9066E6D565C58A1B71AF2CCB7E9D4E7" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_3F55B581B4232F4F9AC4F2CCB7E97516" xlink:to="loc_cae_Loansandreceivablesinterestrate_A9066E6D565C58A1B71AF2CCB7E9D4E7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NoncurrentLoansAndReceivables" xlink:label="loc_ifrs-full_NoncurrentLoansAndReceivables_1C20EB92850BA6E2BB86F2CCB7E9427C" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_3F55B581B4232F4F9AC4F2CCB7E97516" xlink:to="loc_ifrs-full_NoncurrentLoansAndReceivables_1C20EB92850BA6E2BB86F2CCB7E9427C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ServicesReceivedRelatedPartyTransactions" xlink:label="loc_ifrs-full_ServicesReceivedRelatedPartyTransactions_8DD34EF5205FD312E8D1F2CCB7E941C7" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_3F55B581B4232F4F9AC4F2CCB7E97516" xlink:to="loc_ifrs-full_ServicesReceivedRelatedPartyTransactions_8DD34EF5205FD312E8D1F2CCB7E941C7" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/RelatedPartyTransactionsOutstandingBalancesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:label="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_182182D9CA0B4971ACCA67D61A45AA71" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable" xlink:label="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_45BA7D7C1F15302C882967D61A3CA03D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_182182D9CA0B4971ACCA67D61A45AA71" xlink:to="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_45BA7D7C1F15302C882967D61A3CA03D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_68219EC94BFB2564E59D67D61A446F3B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_45BA7D7C1F15302C882967D61A3CA03D" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_68219EC94BFB2564E59D67D61A446F3B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:label="loc_ifrs-full_EntitysTotalForRelatedPartiesMember_82E43679BAC02F922CBF67D61A459363_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_68219EC94BFB2564E59D67D61A446F3B" xlink:to="loc_ifrs-full_EntitysTotalForRelatedPartiesMember_82E43679BAC02F922CBF67D61A459363_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:label="loc_ifrs-full_EntitysTotalForRelatedPartiesMember_82E43679BAC02F922CBF67D61A459363" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_68219EC94BFB2564E59D67D61A446F3B" xlink:to="loc_ifrs-full_EntitysTotalForRelatedPartiesMember_82E43679BAC02F922CBF67D61A459363" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_JointVenturesMember" xlink:label="loc_ifrs-full_JointVenturesMember_52646850B3509387CEF867D6EDBC1C4F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForRelatedPartiesMember_82E43679BAC02F922CBF67D61A459363" xlink:to="loc_ifrs-full_JointVenturesMember_52646850B3509387CEF867D6EDBC1C4F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TradeAndOtherCurrentReceivablesDueFromRelatedParties" xlink:label="loc_ifrs-full_TradeAndOtherCurrentReceivablesDueFromRelatedParties_103C7255A7CABC048C0E67C29D076678" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_182182D9CA0B4971ACCA67D61A45AA71" xlink:to="loc_ifrs-full_TradeAndOtherCurrentReceivablesDueFromRelatedParties_103C7255A7CABC048C0E67C29D076678" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_Contractsinprogressassetsrelatedpartytransactions" xlink:label="loc_cae_Contractsinprogressassetsrelatedpartytransactions_1B66603623900F06E18667DD25656794" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_182182D9CA0B4971ACCA67D61A45AA71" xlink:to="loc_cae_Contractsinprogressassetsrelatedpartytransactions_1B66603623900F06E18667DD25656794" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_Otherassetsrelatedpartytransactions" xlink:label="loc_cae_Otherassetsrelatedpartytransactions_AFB7C3E1AA57E2D812DC67DB95C97C23" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_182182D9CA0B4971ACCA67D61A45AA71" xlink:to="loc_cae_Otherassetsrelatedpartytransactions_AFB7C3E1AA57E2D812DC67DB95C97C23" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TradeAndOtherCurrentPayablesToRelatedParties" xlink:label="loc_ifrs-full_TradeAndOtherCurrentPayablesToRelatedParties_4E26CE215F4E99D59F1267C29D0759C9" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_182182D9CA0B4971ACCA67D61A45AA71" xlink:to="loc_ifrs-full_TradeAndOtherCurrentPayablesToRelatedParties_4E26CE215F4E99D59F1267C29D0759C9" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_Contractsinprogressliabilitiesrelatedpartytransactions" xlink:label="loc_cae_Contractsinprogressliabilitiesrelatedpartytransactions_D75F0F2440902DA50E8367E0B5FC6BA9" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_182182D9CA0B4971ACCA67D61A45AA71" xlink:to="loc_cae_Contractsinprogressliabilitiesrelatedpartytransactions_D75F0F2440902DA50E8367E0B5FC6BA9" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/RelatedPartyTransactionsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/RelatedPartyTransactionsTransactionsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems" xlink:label="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_B7A84014AA3745DD271167C2ADCB47EB" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable" xlink:label="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_BD3DDD769E50D8AB967367C2ADCB6FE0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_B7A84014AA3745DD271167C2ADCB47EB" xlink:to="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_BD3DDD769E50D8AB967367C2ADCB6FE0" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_9DB79219FC518A9834DE67C2ADCB9DFC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_BD3DDD769E50D8AB967367C2ADCB6FE0" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_9DB79219FC518A9834DE67C2ADCB9DFC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:label="loc_ifrs-full_EntitysTotalForRelatedPartiesMember_A955122AA634D3CF607167C2ADCBEA8E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_9DB79219FC518A9834DE67C2ADCB9DFC" xlink:to="loc_ifrs-full_EntitysTotalForRelatedPartiesMember_A955122AA634D3CF607167C2ADCBEA8E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EntitysTotalForRelatedPartiesMember" xlink:label="loc_ifrs-full_EntitysTotalForRelatedPartiesMember_A955122AA634D3CF607167C2ADCBEA8E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_9DB79219FC518A9834DE67C2ADCB9DFC" xlink:to="loc_ifrs-full_EntitysTotalForRelatedPartiesMember_A955122AA634D3CF607167C2ADCBEA8E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_JointVenturesMember" xlink:label="loc_ifrs-full_JointVenturesMember_9E428C6132F39C15C3B867C2ADCB476C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EntitysTotalForRelatedPartiesMember_A955122AA634D3CF607167C2ADCBEA8E" xlink:to="loc_ifrs-full_JointVenturesMember_9E428C6132F39C15C3B867C2ADCB476C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RevenueFromSaleOfGoodsRelatedPartyTransactions" xlink:label="loc_ifrs-full_RevenueFromSaleOfGoodsRelatedPartyTransactions_1A967FDE19318E3EE0F567C2ADCB2A54" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_B7A84014AA3745DD271167C2ADCB47EB" xlink:to="loc_ifrs-full_RevenueFromSaleOfGoodsRelatedPartyTransactions_1A967FDE19318E3EE0F567C2ADCB2A54" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_PurchasesOfGoodsRelatedPartyTransactions" xlink:label="loc_ifrs-full_PurchasesOfGoodsRelatedPartyTransactions_E9F61E00E3C16EF8399867C2ADCD1CDD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_B7A84014AA3745DD271167C2ADCB47EB" xlink:to="loc_ifrs-full_PurchasesOfGoodsRelatedPartyTransactions_E9F61E00E3C16EF8399867C2ADCD1CDD" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_Otherincomerelatedpartytransactions" xlink:label="loc_cae_Otherincomerelatedpartytransactions_5B97B5375391DD43E55D67C2ADCD8ED7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_B7A84014AA3745DD271167C2ADCB47EB" xlink:to="loc_cae_Otherincomerelatedpartytransactions_5B97B5375391DD43E55D67C2ADCD8ED7" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/ShareBasedPayments" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/ShareBasedPaymentsAssumptionsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/ShareBasedPaymentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_51EDB94B4E5EE97181931EC7F8E1D6B5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_51EDB94B4E5EE97181931EC7F8E1D6B5" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="cae-20180331.xsd#cae_VestingPeriod1Axis" xlink:label="loc_cae_VestingPeriod1Axis_D5270724D2E590B60C981EC7F8E2D8F6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_51EDB94B4E5EE97181931EC7F8E1D6B5" xlink:to="loc_cae_VestingPeriod1Axis_D5270724D2E590B60C981EC7F8E2D8F6" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_VestingPeriod1Domain" xlink:label="loc_cae_VestingPeriod1Domain_CB175C1EC14909C4DB411EC7F8E2CF90_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_VestingPeriod1Axis_D5270724D2E590B60C981EC7F8E2D8F6" xlink:to="loc_cae_VestingPeriod1Domain_CB175C1EC14909C4DB411EC7F8E2CF90_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_VestingPeriod1Domain" xlink:label="loc_cae_VestingPeriod1Domain_CB175C1EC14909C4DB411EC7F8E2CF90" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_VestingPeriod1Axis_D5270724D2E590B60C981EC7F8E2D8F6" xlink:to="loc_cae_VestingPeriod1Domain_CB175C1EC14909C4DB411EC7F8E2CF90" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SharebasedCompensationAwardTrancheOneMember" xlink:label="loc_cae_SharebasedCompensationAwardTrancheOneMember_A0A4209BA8C346B1707B1EC7F8E28BBF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_VestingPeriod1Domain_CB175C1EC14909C4DB411EC7F8E2CF90" xlink:to="loc_cae_SharebasedCompensationAwardTrancheOneMember_A0A4209BA8C346B1707B1EC7F8E28BBF" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SharebasedCompensationAwardTrancheTwoMember" xlink:label="loc_cae_SharebasedCompensationAwardTrancheTwoMember_F174D5AC3B99623A91C21EC7F8E3A40B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_VestingPeriod1Domain_CB175C1EC14909C4DB411EC7F8E2CF90" xlink:to="loc_cae_SharebasedCompensationAwardTrancheTwoMember_F174D5AC3B99623A91C21EC7F8E3A40B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SharebasedCompensationAwardTrancheThreeMember" xlink:label="loc_cae_SharebasedCompensationAwardTrancheThreeMember_A73C56A7749C7550B5741EC7F8E31E08" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_VestingPeriod1Domain_CB175C1EC14909C4DB411EC7F8E2CF90" xlink:to="loc_cae_SharebasedCompensationAwardTrancheThreeMember_A73C56A7749C7550B5741EC7F8E31E08" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SharebasedCompensationAwardTrancheFourMember" xlink:label="loc_cae_SharebasedCompensationAwardTrancheFourMember_F9C04359E50C3C10A58E1EC7F8E36C83" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_VestingPeriod1Domain_CB175C1EC14909C4DB411EC7F8E2CF90" xlink:to="loc_cae_SharebasedCompensationAwardTrancheFourMember_F9C04359E50C3C10A58E1EC7F8E36C83" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SharebasedCompensationAwardTrancheFiveMember" xlink:label="loc_cae_SharebasedCompensationAwardTrancheFiveMember_DE1798C7360CA22247FF1EC7F8E3ADA9" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_VestingPeriod1Domain_CB175C1EC14909C4DB411EC7F8E2CF90" xlink:to="loc_cae_SharebasedCompensationAwardTrancheFiveMember_DE1798C7360CA22247FF1EC7F8E3ADA9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangeAxis" xlink:label="loc_ifrs-full_RangeAxis_4BBCAC7FE181870F7B231EC7F8E35D83" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_51EDB94B4E5EE97181931EC7F8E1D6B5" xlink:to="loc_ifrs-full_RangeAxis_4BBCAC7FE181870F7B231EC7F8E35D83" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="loc_ifrs-full_RangesMember_65848A3F8CFC993028281EC7F8E3B8B4_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_4BBCAC7FE181870F7B231EC7F8E35D83" xlink:to="loc_ifrs-full_RangesMember_65848A3F8CFC993028281EC7F8E3B8B4_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="loc_ifrs-full_RangesMember_65848A3F8CFC993028281EC7F8E3B8B4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_4BBCAC7FE181870F7B231EC7F8E35D83" xlink:to="loc_ifrs-full_RangesMember_65848A3F8CFC993028281EC7F8E3B8B4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TopOfRangeMember" xlink:label="loc_ifrs-full_TopOfRangeMember_C3B045EBD55AE518AA5B1EC7F8E49983" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesMember_65848A3F8CFC993028281EC7F8E3B8B4" xlink:to="loc_ifrs-full_TopOfRangeMember_C3B045EBD55AE518AA5B1EC7F8E49983" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BottomOfRangeMember" xlink:label="loc_ifrs-full_BottomOfRangeMember_3D8E9F8F1B610C84D3021EC7F8E457B3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesMember_65848A3F8CFC993028281EC7F8E3B8B4" xlink:to="loc_ifrs-full_BottomOfRangeMember_3D8E9F8F1B610C84D3021EC7F8E457B3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ClassesOfFinancialAssetsAxis" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsAxis_F00CBDFABEA666BAC5731EC7F8E4C2B2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_51EDB94B4E5EE97181931EC7F8E1D6B5" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsAxis_F00CBDFABEA666BAC5731EC7F8E4C2B2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialAssetsMember" xlink:label="loc_ifrs-full_FinancialAssetsMember_29A3CA193927D7FE02581EC7F8E4EA45_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_F00CBDFABEA666BAC5731EC7F8E4C2B2" xlink:to="loc_ifrs-full_FinancialAssetsMember_29A3CA193927D7FE02581EC7F8E4EA45_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_FinancialAssetsMember" xlink:label="loc_ifrs-full_FinancialAssetsMember_29A3CA193927D7FE02581EC7F8E4EA45" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_F00CBDFABEA666BAC5731EC7F8E4C2B2" xlink:to="loc_ifrs-full_FinancialAssetsMember_29A3CA193927D7FE02581EC7F8E4EA45" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EquitySwapAgreementsMember" xlink:label="loc_cae_EquitySwapAgreementsMember_23C6C6E9EC339BBB04541EC7F8E5C74F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_FinancialAssetsMember_29A3CA193927D7FE02581EC7F8E4EA45" xlink:to="loc_cae_EquitySwapAgreementsMember_23C6C6E9EC339BBB04541EC7F8E5C74F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_B8FCF3206B92D45B33C61EC7F8E58F8D" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_51EDB94B4E5EE97181931EC7F8E1D6B5" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_B8FCF3206B92D45B33C61EC7F8E58F8D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SharebasedPaymentArrangementsMember" xlink:label="loc_ifrs-full_SharebasedPaymentArrangementsMember_CC05D871D48F277D4D3A1EC7F8E5FD22_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_B8FCF3206B92D45B33C61EC7F8E58F8D" xlink:to="loc_ifrs-full_SharebasedPaymentArrangementsMember_CC05D871D48F277D4D3A1EC7F8E5FD22_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SharebasedPaymentArrangementsMember" xlink:label="loc_ifrs-full_SharebasedPaymentArrangementsMember_CC05D871D48F277D4D3A1EC7F8E5FD22" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_B8FCF3206B92D45B33C61EC7F8E58F8D" xlink:to="loc_ifrs-full_SharebasedPaymentArrangementsMember_CC05D871D48F277D4D3A1EC7F8E5FD22" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EmployeeStockOptionPlanMember" xlink:label="loc_cae_EmployeeStockOptionPlanMember_12F99A6A453EC6309AFE1EC7F8E52D23" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_CC05D871D48F277D4D3A1EC7F8E5FD22" xlink:to="loc_cae_EmployeeStockOptionPlanMember_12F99A6A453EC6309AFE1EC7F8E52D23" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EmployeeStockPurchasePlanESPPMember" xlink:label="loc_cae_EmployeeStockPurchasePlanESPPMember_836FEC3539D73F97673D1EC7F8E6F8EF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_CC05D871D48F277D4D3A1EC7F8E5FD22" xlink:to="loc_cae_EmployeeStockPurchasePlanESPPMember_836FEC3539D73F97673D1EC7F8E6F8EF" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ExecutiveDeferredShareUnitEDSUMember" xlink:label="loc_cae_ExecutiveDeferredShareUnitEDSUMember_3BE4918040778EEADF1B1EC7F8E6B5DB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_CC05D871D48F277D4D3A1EC7F8E5FD22" xlink:to="loc_cae_ExecutiveDeferredShareUnitEDSUMember_3BE4918040778EEADF1B1EC7F8E6B5DB" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DeferredShareUnitDSUMember" xlink:label="loc_cae_DeferredShareUnitDSUMember_C9059CDCDE26DB7B3E2C1EC7F8E698AE" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_CC05D871D48F277D4D3A1EC7F8E5FD22" xlink:to="loc_cae_DeferredShareUnitDSUMember_C9059CDCDE26DB7B3E2C1EC7F8E698AE" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LongTermIncentiveTimeBasedPlanMember" xlink:label="loc_cae_LongTermIncentiveTimeBasedPlanMember_28FACAA63FBB835037861EC7F8E60AB9" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_CC05D871D48F277D4D3A1EC7F8E5FD22" xlink:to="loc_cae_LongTermIncentiveTimeBasedPlanMember_28FACAA63FBB835037861EC7F8E60AB9" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LongTermIncentiveDeferredShareUnitPlanLTIDSUMember" xlink:label="loc_cae_LongTermIncentiveDeferredShareUnitPlanLTIDSUMember_69E85342A2EB0C0E2F641EC7F8E6C798" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_CC05D871D48F277D4D3A1EC7F8E5FD22" xlink:to="loc_cae_LongTermIncentiveDeferredShareUnitPlanLTIDSUMember_69E85342A2EB0C0E2F641EC7F8E6C798" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LongTermIncentiveTimeBasedRestrictedShareUnitPlanLTITBRSUMember" xlink:label="loc_cae_LongTermIncentiveTimeBasedRestrictedShareUnitPlanLTITBRSUMember_22AE78ABEFACC941ADA41EC7F8E61C2F" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_CC05D871D48F277D4D3A1EC7F8E5FD22" xlink:to="loc_cae_LongTermIncentiveTimeBasedRestrictedShareUnitPlanLTITBRSUMember_22AE78ABEFACC941ADA41EC7F8E61C2F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LongTermIncentivePerformanceBasedPlanMember" xlink:label="loc_cae_LongTermIncentivePerformanceBasedPlanMember_E729999D17664B2965FF1EC7F8E73E14" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_CC05D871D48F277D4D3A1EC7F8E5FD22" xlink:to="loc_cae_LongTermIncentivePerformanceBasedPlanMember_E729999D17664B2965FF1EC7F8E73E14" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LongTermIncentiveRestrictedShareUnitPlanLTIRSUMember" xlink:label="loc_cae_LongTermIncentiveRestrictedShareUnitPlanLTIRSUMember_AD6F70134E96C456FF491EC7F8E77BEE" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_CC05D871D48F277D4D3A1EC7F8E5FD22" xlink:to="loc_cae_LongTermIncentiveRestrictedShareUnitPlanLTIRSUMember_AD6F70134E96C456FF491EC7F8E77BEE" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LongTermIncentivePerformanceShareUnitPlanLTIPSUMember" xlink:label="loc_cae_LongTermIncentivePerformanceShareUnitPlanLTIPSUMember_EDBA93DFF29E7AA1826D1EC7F8E79505" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_CC05D871D48F277D4D3A1EC7F8E5FD22" xlink:to="loc_cae_LongTermIncentivePerformanceShareUnitPlanLTIPSUMember_EDBA93DFF29E7AA1826D1EC7F8E79505" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EmployeeServiceSharebasedCompensationAllocationofRecognizedPeriodCostsCapitalizedAmount1" xlink:label="loc_cae_EmployeeServiceSharebasedCompensationAllocationofRecognizedPeriodCostsCapitalizedAmount1_75C3BB9B046C07099B741EC7F8E74BD0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_EmployeeServiceSharebasedCompensationAllocationofRecognizedPeriodCostsCapitalizedAmount1_75C3BB9B046C07099B741EC7F8E74BD0" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_HedgingNumberofFinancialInstitutions" xlink:label="loc_cae_HedgingNumberofFinancialInstitutions_A62987CE053C14A054791EC7F8E85DE9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_HedgingNumberofFinancialInstitutions_A62987CE053C14A054791EC7F8E85DE9" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_HedgingRecoveryRecognized" xlink:label="loc_cae_HedgingRecoveryRecognized_CC4EDF294F2F7A50B3E21EC7F8E89125" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_HedgingRecoveryRecognized_CC4EDF294F2F7A50B3E21EC7F8E89125" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SubscriptionPricePercentage" xlink:label="loc_cae_SubscriptionPricePercentage_68538B0ADE343DEDD8791EC7F8E86F6E" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_SubscriptionPricePercentage_68538B0ADE343DEDD8791EC7F8E86F6E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofSharesAvailableforGrant1" xlink:label="loc_cae_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofSharesAvailableforGrant1_65EDDD42B47A05DBEAB31EC7F8E8EAF8" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofSharesAvailableforGrant1_65EDDD42B47A05DBEAB31EC7F8E8EAF8" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ExercisableOptionsPeriod" xlink:label="loc_cae_ExercisableOptionsPeriod_EDDA8956AF8F1395972C1EC7F8E8AC21" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_ExercisableOptionsPeriod_EDDA8956AF8F1395972C1EC7F8E8AC21" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NotExercisableOptionsGrantDatePeriod" xlink:label="loc_cae_NotExercisableOptionsGrantDatePeriod_D4DA5A8274834BAFE9C01EC7F8E9BC56" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_NotExercisableOptionsGrantDatePeriod_D4DA5A8274834BAFE9C01EC7F8E9BC56" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ExercisableOptionsGrantDatePeriod" xlink:label="loc_cae_ExercisableOptionsGrantDatePeriod_D164B9364CC883ECF5761EC7F8E959E3" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_ExercisableOptionsGrantDatePeriod_D164B9364CC883ECF5761EC7F8E959E3" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_WeightedAverageSharePriceForShareOptionsInSharebasedPaymentArrangementAverageMarketPrice" xlink:label="loc_cae_WeightedAverageSharePriceForShareOptionsInSharebasedPaymentArrangementAverageMarketPrice_F30667C1A3A1E55D0A721EC7F8E91663" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_WeightedAverageSharePriceForShareOptionsInSharebasedPaymentArrangementAverageMarketPrice_F30667C1A3A1E55D0A721EC7F8E91663" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment" xlink:label="loc_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment_14B2D4B21E7BD0085C101EC7F8E9378E" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_ifrs-full_KeyManagementPersonnelCompensationSharebasedPayment_14B2D4B21E7BD0085C101EC7F8E9378E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DefinedContributionPlanEmployerMatchingContributionPercent2" xlink:label="loc_cae_DefinedContributionPlanEmployerMatchingContributionPercent2_118414FBA7D7888DA4201EC7F8E9D0F9" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_DefinedContributionPlanEmployerMatchingContributionPercent2_118414FBA7D7888DA4201EC7F8E9D0F9" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DefinedContributionPlanEmployerMatchingContributionPercentofMatch1" xlink:label="loc_cae_DefinedContributionPlanEmployerMatchingContributionPercentofMatch1_E9A0666B2DB9C989E56C1EC7F8E9A896" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_DefinedContributionPlanEmployerMatchingContributionPercentofMatch1_E9A0666B2DB9C989E56C1EC7F8E9A896" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberofDaysPriorToIncentiveCompensationPayableToExecutives" xlink:label="loc_cae_NumberofDaysPriorToIncentiveCompensationPayableToExecutives_FA0BD0C4EBCF20E3AF801EC7F8EA1C71" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_NumberofDaysPriorToIncentiveCompensationPayableToExecutives_FA0BD0C4EBCF20E3AF801EC7F8EA1C71" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ValueofExecutiveDeferredShareUnitEDSUShares" xlink:label="loc_cae_ValueofExecutiveDeferredShareUnitEDSUShares_83BBE6C586BA3EA913E21EC7F8EAB8D6" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_ValueofExecutiveDeferredShareUnitEDSUShares_83BBE6C586BA3EA913E21EC7F8EAB8D6" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ValueofDeferredShareUnitDSUShares" xlink:label="loc_cae_ValueofDeferredShareUnitDSUShares_9B2ED30F963ACE94684F1EC7F8EA9BF8" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_ValueofDeferredShareUnitDSUShares_9B2ED30F963ACE94684F1EC7F8EA9BF8" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberofDaysPriorToIssuanceofDeferredSharesUnits" xlink:label="loc_cae_NumberofDaysPriorToIssuanceofDeferredSharesUnits_6BBEC0EF8C36D55E823F1EC7F8EA4FD3" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_NumberofDaysPriorToIssuanceofDeferredSharesUnits_6BBEC0EF8C36D55E823F1EC7F8EA4FD3" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberofLongTermIncentiveTimeBasedPlans" xlink:label="loc_cae_NumberofLongTermIncentiveTimeBasedPlans_28C972A96F973C80EB731EC7F8EAFDB7" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_NumberofLongTermIncentiveTimeBasedPlans_28C972A96F973C80EB731EC7F8EAFDB7" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ValueofLongTermIncentiveTimeBasedPlansShares" xlink:label="loc_cae_ValueofLongTermIncentiveTimeBasedPlansShares_E137684DF1361F1C0C5D1EC7F8EA7A7A" xlink:type="locator" />
    <link:definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_ValueofLongTermIncentiveTimeBasedPlansShares_E137684DF1361F1C0C5D1EC7F8EA7A7A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberofLongTermIncentiveTimeBasedPlansNoLongerGranted" xlink:label="loc_cae_NumberofLongTermIncentiveTimeBasedPlansNoLongerGranted_726117ADCECEDDB18AB91EC7F8EBA80D" xlink:type="locator" />
    <link:definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_NumberofLongTermIncentiveTimeBasedPlansNoLongerGranted_726117ADCECEDDB18AB91EC7F8EBA80D" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_cae_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingPeriod1_65E9CECEC9DBAFF872FB1EC7F8EBCD19" xlink:type="locator" />
    <link:definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingPeriod1_65E9CECEC9DBAFF872FB1EC7F8EBCD19" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberofLongTermIncentivePerformanceBasedPlans" xlink:label="loc_cae_NumberofLongTermIncentivePerformanceBasedPlans_8598B5AC6F36A217CE8D1EC7F8EBF8B2" xlink:type="locator" />
    <link:definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_NumberofLongTermIncentivePerformanceBasedPlans_8598B5AC6F36A217CE8D1EC7F8EBF8B2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberofLongTermIncentivePerformanceBasedPlansNoLongerGranted" xlink:label="loc_cae_NumberofLongTermIncentivePerformanceBasedPlansNoLongerGranted_524B98D376323E9FD9E31EC7F8EB776D" xlink:type="locator" />
    <link:definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_NumberofLongTermIncentivePerformanceBasedPlansNoLongerGranted_524B98D376323E9FD9E31EC7F8EB776D" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PerformanceCriteriaPercentage" xlink:label="loc_cae_PerformanceCriteriaPercentage_EDCE71AC2BB532C29D341EC7F8EBA97B" xlink:type="locator" />
    <link:definitionArc order="23" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_PerformanceCriteriaPercentage_EDCE71AC2BB532C29D341EC7F8EBA97B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingPercentage" xlink:label="loc_cae_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingPercentage_BCB191136977CA5C1F311EC7F8EB04D3" xlink:type="locator" />
    <link:definitionArc order="24" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_4B5DFE4A7BAB0C0588C51EC7F8E7F454" xlink:to="loc_cae_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardVestingPercentage_BCB191136977CA5C1F311EC7F8EB04D3" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/ShareBasedPaymentsDsuActivityDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_98EB884C9E5876D007391E484AAD5A4F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_1EE9858FD2483016EBE11E484AA5544B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_98EB884C9E5876D007391E484AAD5A4F" xlink:to="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_1EE9858FD2483016EBE11E484AA5544B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_0FDFA17A7A78E6CC116A1E484AAAE40D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_1EE9858FD2483016EBE11E484AA5544B" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_0FDFA17A7A78E6CC116A1E484AAAE40D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SharebasedPaymentArrangementsMember" xlink:label="loc_ifrs-full_SharebasedPaymentArrangementsMember_37252E59FDFEF5A31F191E484AABCEA2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_0FDFA17A7A78E6CC116A1E484AAAE40D" xlink:to="loc_ifrs-full_SharebasedPaymentArrangementsMember_37252E59FDFEF5A31F191E484AABCEA2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SharebasedPaymentArrangementsMember" xlink:label="loc_ifrs-full_SharebasedPaymentArrangementsMember_37252E59FDFEF5A31F191E484AABCEA2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_0FDFA17A7A78E6CC116A1E484AAAE40D" xlink:to="loc_ifrs-full_SharebasedPaymentArrangementsMember_37252E59FDFEF5A31F191E484AABCEA2" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DeferredShareUnitDSUMember" xlink:label="loc_cae_DeferredShareUnitDSUMember_8CDBFE10D8EF0FB242F21E484AABA9D2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_37252E59FDFEF5A31F191E484AABCEA2" xlink:to="loc_cae_DeferredShareUnitDSUMember_8CDBFE10D8EF0FB242F21E484AABA9D2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_D483C5A0F5B5C883E71B1E484AAD3356" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_98EB884C9E5876D007391E484AAD5A4F" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_D483C5A0F5B5C883E71B1E484AAD3356" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" xlink:label="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_A0AD2ECCD9E3A5A4C7541E484AAF11C6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_98EB884C9E5876D007391E484AAD5A4F" xlink:to="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_A0AD2ECCD9E3A5A4C7541E484AAF11C6" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberOfOtherEquityInstrumentsRedeemedInSharebasedPaymentArrangement" xlink:label="loc_cae_NumberOfOtherEquityInstrumentsRedeemedInSharebasedPaymentArrangement_85887444F6CA959ED0DD1E484AAFDFF4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_98EB884C9E5876D007391E484AAD5A4F" xlink:to="loc_cae_NumberOfOtherEquityInstrumentsRedeemedInSharebasedPaymentArrangement_85887444F6CA959ED0DD1E484AAFDFF4" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberOfOtherEquityInstrumentsDividendsPaidInSharebasedPaymentArrangement" xlink:label="loc_cae_NumberOfOtherEquityInstrumentsDividendsPaidInSharebasedPaymentArrangement_FC8E1AA6671B42E12DA21E484AB01B2E" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_98EB884C9E5876D007391E484AAD5A4F" xlink:to="loc_cae_NumberOfOtherEquityInstrumentsDividendsPaidInSharebasedPaymentArrangement_FC8E1AA6671B42E12DA21E484AB01B2E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberOfOtherEquityInstrumentsVestedInSharebasedPaymentArrangement" xlink:label="loc_cae_NumberOfOtherEquityInstrumentsVestedInSharebasedPaymentArrangement_CCF32A6FA4ECBA0828B11E484AB0FC39" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_98EB884C9E5876D007391E484AAD5A4F" xlink:to="loc_cae_NumberOfOtherEquityInstrumentsVestedInSharebasedPaymentArrangement_CCF32A6FA4ECBA0828B11E484AB0FC39" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/ShareBasedPaymentsEsopActivityDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_11E2E59A32774C272D9ED0AE1132B166" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_1D8F1EA89317AB70E3F7D0AE11329DA2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_11E2E59A32774C272D9ED0AE1132B166" xlink:to="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_1D8F1EA89317AB70E3F7D0AE11329DA2" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_5AF4A1A9305976D8EAD7D0AE11326370" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_1D8F1EA89317AB70E3F7D0AE11329DA2" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_5AF4A1A9305976D8EAD7D0AE11326370" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SharebasedPaymentArrangementsMember" xlink:label="loc_ifrs-full_SharebasedPaymentArrangementsMember_C492180870AD26A07CBED0AE11326A5C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_5AF4A1A9305976D8EAD7D0AE11326370" xlink:to="loc_ifrs-full_SharebasedPaymentArrangementsMember_C492180870AD26A07CBED0AE11326A5C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SharebasedPaymentArrangementsMember" xlink:label="loc_ifrs-full_SharebasedPaymentArrangementsMember_C492180870AD26A07CBED0AE11326A5C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_5AF4A1A9305976D8EAD7D0AE11326370" xlink:to="loc_ifrs-full_SharebasedPaymentArrangementsMember_C492180870AD26A07CBED0AE11326A5C" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EmployeeStockOptionPlanMember" xlink:label="loc_cae_EmployeeStockOptionPlanMember_28BB485B0EE281A2F92AD0AE1132F8DE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_C492180870AD26A07CBED0AE11326A5C" xlink:to="loc_cae_EmployeeStockOptionPlanMember_28BB485B0EE281A2F92AD0AE1132F8DE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfOutstandingShareOptions" xlink:label="loc_ifrs-full_NumberOfOutstandingShareOptions_E712DD4A1376FE7F02FCD0AE1132E80C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_11E2E59A32774C272D9ED0AE1132B166" xlink:to="loc_ifrs-full_NumberOfOutstandingShareOptions_E712DD4A1376FE7F02FCD0AE1132E80C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement_5040FD443772EEC774FAD0AE113376A4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_11E2E59A32774C272D9ED0AE1132B166" xlink:to="loc_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement_5040FD443772EEC774FAD0AE113376A4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_89427A4BD53E40967BBED0AE1133850E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_11E2E59A32774C272D9ED0AE1132B166" xlink:to="loc_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_89427A4BD53E40967BBED0AE1133850E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement_D47177FC08A760F64D58D0AE11384C16" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_11E2E59A32774C272D9ED0AE1132B166" xlink:to="loc_ifrs-full_NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement_D47177FC08A760F64D58D0AE11384C16" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement_D7B989FA55554EEB323FD0AE1138D71A" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_11E2E59A32774C272D9ED0AE1132B166" xlink:to="loc_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement_D7B989FA55554EEB323FD0AE1138D71A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement_947BF1CAB405BAB21044D0AE113397AE" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_11E2E59A32774C272D9ED0AE1132B166" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement_947BF1CAB405BAB21044D0AE113397AE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement_E528F8C8836157D24380D0AE11335B46" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_11E2E59A32774C272D9ED0AE1132B166" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement_E528F8C8836157D24380D0AE11335B46" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement_7E95FBD37E8967207177D0AE1138E525" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_11E2E59A32774C272D9ED0AE1132B166" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement_7E95FBD37E8967207177D0AE1138E525" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement_A93E9F5A4A066897907FD0AE1138DA27" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_11E2E59A32774C272D9ED0AE1132B166" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement_A93E9F5A4A066897907FD0AE1138DA27" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement_88EA795DA62B2139A4DFD0AE11381420" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_11E2E59A32774C272D9ED0AE1132B166" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement_88EA795DA62B2139A4DFD0AE11381420" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/ShareBasedPaymentsEsopSummarizedDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems" xlink:label="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems_E634E055563AFE0E306719767ECA02DD" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable" xlink:label="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable_068229D7FFBEEDB3989F19767EB683DE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems_E634E055563AFE0E306719767ECA02DD" xlink:to="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable_068229D7FFBEEDB3989F19767EB683DE" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangeAxis" xlink:label="loc_ifrs-full_RangeAxis_13F4C1BA8ADFEFEDC69C19767EB77291" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable_068229D7FFBEEDB3989F19767EB683DE" xlink:to="loc_ifrs-full_RangeAxis_13F4C1BA8ADFEFEDC69C19767EB77291" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="loc_ifrs-full_RangesMember_5B5464B0C0406F4D887A19767EB7EC55_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_13F4C1BA8ADFEFEDC69C19767EB77291" xlink:to="loc_ifrs-full_RangesMember_5B5464B0C0406F4D887A19767EB7EC55_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="loc_ifrs-full_RangesMember_5B5464B0C0406F4D887A19767EB7EC55" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_13F4C1BA8ADFEFEDC69C19767EB77291" xlink:to="loc_ifrs-full_RangesMember_5B5464B0C0406F4D887A19767EB7EC55" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BottomOfRangeMember" xlink:label="loc_ifrs-full_BottomOfRangeMember_63F59D245290F924F25619767EBDE20A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesMember_5B5464B0C0406F4D887A19767EB7EC55" xlink:to="loc_ifrs-full_BottomOfRangeMember_63F59D245290F924F25619767EBDE20A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TopOfRangeMember" xlink:label="loc_ifrs-full_TopOfRangeMember_1958AA9BD1192DC7F44519767EBE1B60" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesMember_5B5464B0C0406F4D887A19767EB7EC55" xlink:to="loc_ifrs-full_TopOfRangeMember_1958AA9BD1192DC7F44519767EBE1B60" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis" xlink:label="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis_4353EBA244AFE45E4B5F19767EBFB0A3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable_068229D7FFBEEDB3989F19767EB683DE" xlink:to="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis_4353EBA244AFE45E4B5F19767EBFB0A3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember" xlink:label="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember_3A51AB866ADE62030ECF19767EC0C3DD_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis_4353EBA244AFE45E4B5F19767EBFB0A3" xlink:to="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember_3A51AB866ADE62030ECF19767EC0C3DD_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember" xlink:label="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember_3A51AB866ADE62030ECF19767EC0C3DD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsAxis_4353EBA244AFE45E4B5F19767EBFB0A3" xlink:to="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember_3A51AB866ADE62030ECF19767EC0C3DD" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ExercisePriceRangeOneMember" xlink:label="loc_cae_ExercisePriceRangeOneMember_2F7C55A940FF597EB18D19767EC005BE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember_3A51AB866ADE62030ECF19767EC0C3DD" xlink:to="loc_cae_ExercisePriceRangeOneMember_2F7C55A940FF597EB18D19767EC005BE" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ExercisePriceRangeTwoMember" xlink:label="loc_cae_ExercisePriceRangeTwoMember_53163A7474804B3364FE19767EC1FC23" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember_3A51AB866ADE62030ECF19767EC0C3DD" xlink:to="loc_cae_ExercisePriceRangeTwoMember_53163A7474804B3364FE19767EC1FC23" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ExercisePriceRangeThreeMember" xlink:label="loc_cae_ExercisePriceRangeThreeMember_8A2E8F054160FC22376919767EC13CAD" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember_3A51AB866ADE62030ECF19767EC0C3DD" xlink:to="loc_cae_ExercisePriceRangeThreeMember_8A2E8F054160FC22376919767EC13CAD" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ExercisePriceRangeFourMember" xlink:label="loc_cae_ExercisePriceRangeFourMember_D8AE5F67C8526142E3EB19767EC217D3" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesOfExercisePricesForOutstandingShareOptionsMember_3A51AB866ADE62030ECF19767EC0C3DD" xlink:to="loc_cae_ExercisePriceRangeFourMember_D8AE5F67C8526142E3EB19767EC217D3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_844C462B7CE4E5BEB96119767EC217B4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable_068229D7FFBEEDB3989F19767EB683DE" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_844C462B7CE4E5BEB96119767EC217B4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SharebasedPaymentArrangementsMember" xlink:label="loc_ifrs-full_SharebasedPaymentArrangementsMember_BE9D15917BE6905E865819767EC9EAC4_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_844C462B7CE4E5BEB96119767EC217B4" xlink:to="loc_ifrs-full_SharebasedPaymentArrangementsMember_BE9D15917BE6905E865819767EC9EAC4_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SharebasedPaymentArrangementsMember" xlink:label="loc_ifrs-full_SharebasedPaymentArrangementsMember_BE9D15917BE6905E865819767EC9EAC4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_844C462B7CE4E5BEB96119767EC217B4" xlink:to="loc_ifrs-full_SharebasedPaymentArrangementsMember_BE9D15917BE6905E865819767EC9EAC4" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EmployeeStockOptionPlanMember" xlink:label="loc_cae_EmployeeStockOptionPlanMember_571AD33D179CB4957BB019767EC9EB7C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_BE9D15917BE6905E865819767EC9EAC4" xlink:to="loc_cae_EmployeeStockOptionPlanMember_571AD33D179CB4957BB019767EC9EB7C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ExercisePriceOfOutstandingShareOptions" xlink:label="loc_ifrs-full_ExercisePriceOfOutstandingShareOptions_78EF175F1F0B9F8667B119767ECA23DF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems_E634E055563AFE0E306719767ECA02DD" xlink:to="loc_ifrs-full_ExercisePriceOfOutstandingShareOptions_78EF175F1F0B9F8667B119767ECA23DF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfOutstandingShareOptions" xlink:label="loc_ifrs-full_NumberOfOutstandingShareOptions_7A1A5C6579449DF8348819767ECB2C45" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems_E634E055563AFE0E306719767ECA02DD" xlink:to="loc_ifrs-full_NumberOfOutstandingShareOptions_7A1A5C6579449DF8348819767ECB2C45" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_WeightedAverageRemainingContractualLifeOfOutstandingShareOptionsPeriod" xlink:label="loc_cae_WeightedAverageRemainingContractualLifeOfOutstandingShareOptionsPeriod_C64C0C2BD06B42ADC2E919767ECB38C3" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems_E634E055563AFE0E306719767ECA02DD" xlink:to="loc_cae_WeightedAverageRemainingContractualLifeOfOutstandingShareOptionsPeriod_C64C0C2BD06B42ADC2E919767ECB38C3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement_18CF9E777037516CAF0619767ECC2C56" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems_E634E055563AFE0E306719767ECA02DD" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement_18CF9E777037516CAF0619767ECC2C56" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement_71F06756F8022D49AA3A19771E204DBA" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems_E634E055563AFE0E306719767ECA02DD" xlink:to="loc_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement_71F06756F8022D49AA3A19771E204DBA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement_F2B11785D6B3287DD2DB19771F062423" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems_E634E055563AFE0E306719767ECA02DD" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement_F2B11785D6B3287DD2DB19771F062423" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/ShareBasedPaymentsLtiActivityDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_B0B31A00683E0BE44EDB1E48A77D5008" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_7ADE20AF885DA1076B951E48A77BCFB6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_B0B31A00683E0BE44EDB1E48A77D5008" xlink:to="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_7ADE20AF885DA1076B951E48A77BCFB6" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_B84043991B2BF2A36D0D1E48A77CA53E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_7ADE20AF885DA1076B951E48A77BCFB6" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_B84043991B2BF2A36D0D1E48A77CA53E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SharebasedPaymentArrangementsMember" xlink:label="loc_ifrs-full_SharebasedPaymentArrangementsMember_C946204BCD6D8A59DD891E48A77C5CBD_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_B84043991B2BF2A36D0D1E48A77CA53E" xlink:to="loc_ifrs-full_SharebasedPaymentArrangementsMember_C946204BCD6D8A59DD891E48A77C5CBD_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SharebasedPaymentArrangementsMember" xlink:label="loc_ifrs-full_SharebasedPaymentArrangementsMember_C946204BCD6D8A59DD891E48A77C5CBD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_B84043991B2BF2A36D0D1E48A77CA53E" xlink:to="loc_ifrs-full_SharebasedPaymentArrangementsMember_C946204BCD6D8A59DD891E48A77C5CBD" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LongTermIncentiveDeferredShareUnitPlanLTIDSUMember" xlink:label="loc_cae_LongTermIncentiveDeferredShareUnitPlanLTIDSUMember_FFA8B7161818B3FEAA6A1E48A77C87C9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_C946204BCD6D8A59DD891E48A77C5CBD" xlink:to="loc_cae_LongTermIncentiveDeferredShareUnitPlanLTIDSUMember_FFA8B7161818B3FEAA6A1E48A77C87C9" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LongTermIncentiveTimeBasedRestrictedShareUnitPlanLTITBRSUMember" xlink:label="loc_cae_LongTermIncentiveTimeBasedRestrictedShareUnitPlanLTITBRSUMember_681AEAD87733210379BE1E48A77D474E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_C946204BCD6D8A59DD891E48A77C5CBD" xlink:to="loc_cae_LongTermIncentiveTimeBasedRestrictedShareUnitPlanLTITBRSUMember_681AEAD87733210379BE1E48A77D474E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_DE95BED67581564D657D1E48A77D3C88" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_B0B31A00683E0BE44EDB1E48A77D5008" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_DE95BED67581564D657D1E48A77D3C88" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" xlink:label="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_9490B64FBEAAE227CAEC1E48A77E2FA8" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_B0B31A00683E0BE44EDB1E48A77D5008" xlink:to="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_9490B64FBEAAE227CAEC1E48A77E2FA8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement_C1D27C0E70AB9E1D48A91E48A77EBA9F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_B0B31A00683E0BE44EDB1E48A77D5008" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement_C1D27C0E70AB9E1D48A91E48A77EBA9F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberOfOtherEquityInstrumentsRedeemedInSharebasedPaymentArrangement" xlink:label="loc_cae_NumberOfOtherEquityInstrumentsRedeemedInSharebasedPaymentArrangement_86C77C123E08E52873E01E48A77F7670" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_B0B31A00683E0BE44EDB1E48A77D5008" xlink:to="loc_cae_NumberOfOtherEquityInstrumentsRedeemedInSharebasedPaymentArrangement_86C77C123E08E52873E01E48A77F7670" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberOfOtherEquityInstrumentsDividendsPaidInSharebasedPaymentArrangement" xlink:label="loc_cae_NumberOfOtherEquityInstrumentsDividendsPaidInSharebasedPaymentArrangement_CDCE548536CD31E879DE1E48A77FF208" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_B0B31A00683E0BE44EDB1E48A77D5008" xlink:to="loc_cae_NumberOfOtherEquityInstrumentsDividendsPaidInSharebasedPaymentArrangement_CDCE548536CD31E879DE1E48A77FF208" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberOfOtherEquityInstrumentsVestedInSharebasedPaymentArrangement" xlink:label="loc_cae_NumberOfOtherEquityInstrumentsVestedInSharebasedPaymentArrangement_45EA828CFA97FCE748321E48A77F1A59" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_B0B31A00683E0BE44EDB1E48A77D5008" xlink:to="loc_cae_NumberOfOtherEquityInstrumentsVestedInSharebasedPaymentArrangement_45EA828CFA97FCE748321E48A77F1A59" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/ShareBasedPaymentsLtiPsuActivityDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_2BC85A4AB277AC2942A01E48A7598B46" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_5A2D2790AEE3E2F851CA1E48A758946B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_2BC85A4AB277AC2942A01E48A7598B46" xlink:to="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_5A2D2790AEE3E2F851CA1E48A758946B" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_D6F148F036CE2907DDCB1E48A7586ED6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_5A2D2790AEE3E2F851CA1E48A758946B" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_D6F148F036CE2907DDCB1E48A7586ED6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SharebasedPaymentArrangementsMember" xlink:label="loc_ifrs-full_SharebasedPaymentArrangementsMember_098762F9DCE0A54F66911E48A7581227_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_D6F148F036CE2907DDCB1E48A7586ED6" xlink:to="loc_ifrs-full_SharebasedPaymentArrangementsMember_098762F9DCE0A54F66911E48A7581227_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SharebasedPaymentArrangementsMember" xlink:label="loc_ifrs-full_SharebasedPaymentArrangementsMember_098762F9DCE0A54F66911E48A7581227" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_D6F148F036CE2907DDCB1E48A7586ED6" xlink:to="loc_ifrs-full_SharebasedPaymentArrangementsMember_098762F9DCE0A54F66911E48A7581227" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LongTermIncentiveRestrictedShareUnitPlanLTIRSUMember" xlink:label="loc_cae_LongTermIncentiveRestrictedShareUnitPlanLTIRSUMember_76A2B96FA48B1EE747E71E48A7593A8B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_098762F9DCE0A54F66911E48A7581227" xlink:to="loc_cae_LongTermIncentiveRestrictedShareUnitPlanLTIRSUMember_76A2B96FA48B1EE747E71E48A7593A8B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LongTermIncentivePerformanceShareUnitPlanLTIPSUMember" xlink:label="loc_cae_LongTermIncentivePerformanceShareUnitPlanLTIPSUMember_34EA3A33FBBCE3072A471E48A7599087" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_098762F9DCE0A54F66911E48A7581227" xlink:to="loc_cae_LongTermIncentivePerformanceShareUnitPlanLTIPSUMember_34EA3A33FBBCE3072A471E48A7599087" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_B1DF7F4883C5DFFF6CAA1E48A75A9277" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_2BC85A4AB277AC2942A01E48A7598B46" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_B1DF7F4883C5DFFF6CAA1E48A75A9277" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted" xlink:label="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_4702C69D6EE9E255BD2B1E48A75AD531" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_2BC85A4AB277AC2942A01E48A7598B46" xlink:to="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_4702C69D6EE9E255BD2B1E48A75AD531" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement_625E90EE9DB5551D6DE51E48A75B9AF3" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_2BC85A4AB277AC2942A01E48A7598B46" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement_625E90EE9DB5551D6DE51E48A75B9AF3" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberOfOtherEquityInstrumentsRedeemedInSharebasedPaymentArrangement" xlink:label="loc_cae_NumberOfOtherEquityInstrumentsRedeemedInSharebasedPaymentArrangement_E01F73ACF61E78526CD31E48A75B1DB3" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_2BC85A4AB277AC2942A01E48A7598B46" xlink:to="loc_cae_NumberOfOtherEquityInstrumentsRedeemedInSharebasedPaymentArrangement_E01F73ACF61E78526CD31E48A75B1DB3" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_NumberOfOtherEquityInstrumentsVestedInSharebasedPaymentArrangement" xlink:label="loc_cae_NumberOfOtherEquityInstrumentsVestedInSharebasedPaymentArrangement_8E5A411A6ED7D51AE5251E48A75B7018" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_2BC85A4AB277AC2942A01E48A7598B46" xlink:to="loc_cae_NumberOfOtherEquityInstrumentsVestedInSharebasedPaymentArrangement_8E5A411A6ED7D51AE5251E48A75B7018" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/ShareBasedPaymentsShareBasedCompensationCostDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_8DD107627CF19694935DFF7C214A4F76" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_19E3D37CAC750A4C4001FF7C2148747F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_8DD107627CF19694935DFF7C214A4F76" xlink:to="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_19E3D37CAC750A4C4001FF7C2148747F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_71CE3678598ABCEB72DCFF7C2148D394" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_19E3D37CAC750A4C4001FF7C2148747F" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_71CE3678598ABCEB72DCFF7C2148D394" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SharebasedPaymentArrangementsMember" xlink:label="loc_ifrs-full_SharebasedPaymentArrangementsMember_CDE93AB38E73CA2F18AFFF7C2148F998_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_71CE3678598ABCEB72DCFF7C2148D394" xlink:to="loc_ifrs-full_SharebasedPaymentArrangementsMember_CDE93AB38E73CA2F18AFFF7C2148F998_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_SharebasedPaymentArrangementsMember" xlink:label="loc_ifrs-full_SharebasedPaymentArrangementsMember_CDE93AB38E73CA2F18AFFF7C2148F998" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_71CE3678598ABCEB72DCFF7C2148D394" xlink:to="loc_ifrs-full_SharebasedPaymentArrangementsMember_CDE93AB38E73CA2F18AFFF7C2148F998" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EmployeeStockPurchasePlanESPPMember" xlink:label="loc_cae_EmployeeStockPurchasePlanESPPMember_9337780FB66EE34E69FBFF7C2149A1DB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_CDE93AB38E73CA2F18AFFF7C2148F998" xlink:to="loc_cae_EmployeeStockPurchasePlanESPPMember_9337780FB66EE34E69FBFF7C2149A1DB" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DeferredShareUnitDSUMember" xlink:label="loc_cae_DeferredShareUnitDSUMember_D04BB51AB3BADC4E3D2EFF7C2149053B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_CDE93AB38E73CA2F18AFFF7C2148F998" xlink:to="loc_cae_DeferredShareUnitDSUMember_D04BB51AB3BADC4E3D2EFF7C2149053B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LongTermIncentiveDeferredShareUnitPlanLTIDSUMember" xlink:label="loc_cae_LongTermIncentiveDeferredShareUnitPlanLTIDSUMember_BBA9EE7FC7195AF3973BFF7C2149DA8A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_CDE93AB38E73CA2F18AFFF7C2148F998" xlink:to="loc_cae_LongTermIncentiveDeferredShareUnitPlanLTIDSUMember_BBA9EE7FC7195AF3973BFF7C2149DA8A" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LongTermIncentiveTimeBasedRestrictedShareUnitPlanLTITBRSUMember" xlink:label="loc_cae_LongTermIncentiveTimeBasedRestrictedShareUnitPlanLTITBRSUMember_7F0664DF07300BD660BFFF7C21499292" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_CDE93AB38E73CA2F18AFFF7C2148F998" xlink:to="loc_cae_LongTermIncentiveTimeBasedRestrictedShareUnitPlanLTITBRSUMember_7F0664DF07300BD660BFFF7C21499292" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_LongTermIncentivePerformanceShareUnitPlanLTIPSUMember" xlink:label="loc_cae_LongTermIncentivePerformanceShareUnitPlanLTIPSUMember_9B1A56BEE20F572ACF44FF7C214A4A59" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_CDE93AB38E73CA2F18AFFF7C2148F998" xlink:to="loc_cae_LongTermIncentivePerformanceShareUnitPlanLTIPSUMember_9B1A56BEE20F572ACF44FF7C214A4A59" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CashSettledShareBasedPaymentArrangementMember" xlink:label="loc_cae_CashSettledShareBasedPaymentArrangementMember_A9294E42CD0400AB6839FF7C214AF8B1" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_CDE93AB38E73CA2F18AFFF7C2148F998" xlink:to="loc_cae_CashSettledShareBasedPaymentArrangementMember_A9294E42CD0400AB6839FF7C214AF8B1" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EmployeeStockOptionPlanMember" xlink:label="loc_cae_EmployeeStockOptionPlanMember_6F38C2B639E9951A43A8FF7C214A60EB" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_CDE93AB38E73CA2F18AFFF7C2148F998" xlink:to="loc_cae_EmployeeStockOptionPlanMember_6F38C2B639E9951A43A8FF7C214A60EB" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_EquitySettledShareBasedPaymentArrangementMember" xlink:label="loc_cae_EquitySettledShareBasedPaymentArrangementMember_0B984F9768BDC8D371FAFF7C214AD7AA" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SharebasedPaymentArrangementsMember_CDE93AB38E73CA2F18AFFF7C2148F998" xlink:to="loc_cae_EquitySettledShareBasedPaymentArrangementMember_0B984F9768BDC8D371FAFF7C214AD7AA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ExpenseFromCashsettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets" xlink:label="loc_ifrs-full_ExpenseFromCashsettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets_BF6F7B4EDC0A91D6C007FF9150F89B72" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_8DD107627CF19694935DFF7C214A4F76" xlink:to="loc_ifrs-full_ExpenseFromCashsettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets_BF6F7B4EDC0A91D6C007FF9150F89B72" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ExpenseFromEquitysettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets" xlink:label="loc_ifrs-full_ExpenseFromEquitysettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets_4516FD848174E1B8424AFF91FED1AA31" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_8DD107627CF19694935DFF7C214A4F76" xlink:to="loc_ifrs-full_ExpenseFromEquitysettledSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets_4516FD848174E1B8424AFF91FED1AA31" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees" xlink:label="loc_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees_4554317FB58B883C0D00FF7C214B0A12" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_8DD107627CF19694935DFF7C214A4F76" xlink:to="loc_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees_4554317FB58B883C0D00FF7C214B0A12" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_LiabilitiesFromSharebasedPaymentTransactions2011" xlink:label="loc_ifrs-full_LiabilitiesFromSharebasedPaymentTransactions2011_0B61E71F08F21F81863FFF8FC1750C13" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_8DD107627CF19694935DFF7C214A4F76" xlink:to="loc_ifrs-full_LiabilitiesFromSharebasedPaymentTransactions2011_0B61E71F08F21F81863FFF8FC1750C13" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/ShareBasedPaymentsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/ShareBasedPaymentsTsrRelativePerformanceIndexDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_DE3054BCEF8C559CE174D0AE143C8855" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_D855357B2B9AF1789D96D0AE143BC95C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_DE3054BCEF8C559CE174D0AE143C8855" xlink:to="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_D855357B2B9AF1789D96D0AE143BC95C" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TSRQuartileAxis" xlink:label="loc_cae_TSRQuartileAxis_040A4EC5F6CDC7A00D33D0AE143BE1F1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_D855357B2B9AF1789D96D0AE143BC95C" xlink:to="loc_cae_TSRQuartileAxis_040A4EC5F6CDC7A00D33D0AE143BE1F1" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TSRQuartileDomain" xlink:label="loc_cae_TSRQuartileDomain_A19365D4FBE2706B49E2D0AE143C9F14_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_TSRQuartileAxis_040A4EC5F6CDC7A00D33D0AE143BE1F1" xlink:to="loc_cae_TSRQuartileDomain_A19365D4FBE2706B49E2D0AE143C9F14_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TSRQuartileDomain" xlink:label="loc_cae_TSRQuartileDomain_A19365D4FBE2706B49E2D0AE143C9F14" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_TSRQuartileAxis_040A4EC5F6CDC7A00D33D0AE143BE1F1" xlink:to="loc_cae_TSRQuartileDomain_A19365D4FBE2706B49E2D0AE143C9F14" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FirstQuartileMember" xlink:label="loc_cae_FirstQuartileMember_1AD153EA6FBF26FAE250D0AE143C018B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_TSRQuartileDomain_A19365D4FBE2706B49E2D0AE143C9F14" xlink:to="loc_cae_FirstQuartileMember_1AD153EA6FBF26FAE250D0AE143C018B" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TwoQuartileMember" xlink:label="loc_cae_TwoQuartileMember_AF7DFF3001EFD31D7D24D0AE143C41F4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_TSRQuartileDomain_A19365D4FBE2706B49E2D0AE143C9F14" xlink:to="loc_cae_TwoQuartileMember_AF7DFF3001EFD31D7D24D0AE143C41F4" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ThreeQuartileMember" xlink:label="loc_cae_ThreeQuartileMember_5C2EC57D30F6BCF2DB1DD0AE143C267E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_TSRQuartileDomain_A19365D4FBE2706B49E2D0AE143C9F14" xlink:to="loc_cae_ThreeQuartileMember_5C2EC57D30F6BCF2DB1DD0AE143C267E" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_FourthQuartileMember" xlink:label="loc_cae_FourthQuartileMember_DA0F4DD2F9B693D815D0D0AE143C0258" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_TSRQuartileDomain_A19365D4FBE2706B49E2D0AE143C9F14" xlink:to="loc_cae_FourthQuartileMember_DA0F4DD2F9B693D815D0D0AE143C0258" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangeAxis" xlink:label="loc_ifrs-full_RangeAxis_0D5E68631DE40B5A498AD0AE143C2BA3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_D855357B2B9AF1789D96D0AE143BC95C" xlink:to="loc_ifrs-full_RangeAxis_0D5E68631DE40B5A498AD0AE143C2BA3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="loc_ifrs-full_RangesMember_C72CC33BE7D85CF831A7D0AE143C2DCC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_0D5E68631DE40B5A498AD0AE143C2BA3" xlink:to="loc_ifrs-full_RangesMember_C72CC33BE7D85CF831A7D0AE143C2DCC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RangesMember" xlink:label="loc_ifrs-full_RangesMember_C72CC33BE7D85CF831A7D0AE143C2DCC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_0D5E68631DE40B5A498AD0AE143C2BA3" xlink:to="loc_ifrs-full_RangesMember_C72CC33BE7D85CF831A7D0AE143C2DCC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_BottomOfRangeMember" xlink:label="loc_ifrs-full_BottomOfRangeMember_3CC3197500FBD262AA6CD0AE143CD263" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesMember_C72CC33BE7D85CF831A7D0AE143C2DCC" xlink:to="loc_ifrs-full_BottomOfRangeMember_3CC3197500FBD262AA6CD0AE143CD263" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_TopOfRangeMember" xlink:label="loc_ifrs-full_TopOfRangeMember_9FE6A169B8A2058146A0D0AE143C056C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangesMember_C72CC33BE7D85CF831A7D0AE143C2DCC" xlink:to="loc_ifrs-full_TopOfRangeMember_9FE6A169B8A2058146A0D0AE143C056C" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TSRPercentilePercentage" xlink:label="loc_cae_TSRPercentilePercentage_BF11478103CC76E06D03D0AE143C177D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_DE3054BCEF8C559CE174D0AE143C8855" xlink:to="loc_cae_TSRPercentilePercentage_BF11478103CC76E06D03D0AE143C177D" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_TSRFactorPercentage" xlink:label="loc_cae_TSRFactorPercentage_51613B19BF82DB536926D0AE143CFAB3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_DE3054BCEF8C559CE174D0AE143C8855" xlink:to="loc_cae_TSRFactorPercentage_51613B19BF82DB536926D0AE143CFAB3" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/ShareCapitalEarningsPerShareAndDividends" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/ShareCapitalEarningsPerShareAndDividendsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EarningsPerShareLineItems" xlink:label="loc_ifrs-full_EarningsPerShareLineItems_DE1797C751CAE7689A3BFF7C21BDF93C" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EarningsPerShareTable" xlink:label="loc_ifrs-full_EarningsPerShareTable_BF6F8CCB772E72553C5CFF7C21BB78E9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_EarningsPerShareLineItems_DE1797C751CAE7689A3BFF7C21BDF93C" xlink:to="loc_ifrs-full_EarningsPerShareTable_BF6F8CCB772E72553C5CFF7C21BB78E9" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_C82B067793D7018DF1E3FF7C21BC13A9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_EarningsPerShareTable_BF6F8CCB772E72553C5CFF7C21BB78E9" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_C82B067793D7018DF1E3FF7C21BC13A9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EquityMember" xlink:label="loc_ifrs-full_EquityMember_9E960D325D9C50C5A6CDFF7C21BC1C28_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_C82B067793D7018DF1E3FF7C21BC13A9" xlink:to="loc_ifrs-full_EquityMember_9E960D325D9C50C5A6CDFF7C21BC1C28_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_EquityMember" xlink:label="loc_ifrs-full_EquityMember_9E960D325D9C50C5A6CDFF7C21BC1C28" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_C82B067793D7018DF1E3FF7C21BC13A9" xlink:to="loc_ifrs-full_EquityMember_9E960D325D9C50C5A6CDFF7C21BC1C28" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_RetainedEarningsMember" xlink:label="loc_ifrs-full_RetainedEarningsMember_0F6252BE2769C1525C97FF7C21BC3068" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_9E960D325D9C50C5A6CDFF7C21BC1C28" xlink:to="loc_ifrs-full_RetainedEarningsMember_0F6252BE2769C1525C97FF7C21BC3068" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ShareRepurchaseProgramType1Axis" xlink:label="loc_cae_ShareRepurchaseProgramType1Axis_EB826957506F5E3C40C9FF7C21BD0CC8" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_EarningsPerShareTable_BF6F8CCB772E72553C5CFF7C21BB78E9" xlink:to="loc_cae_ShareRepurchaseProgramType1Axis_EB826957506F5E3C40C9FF7C21BD0CC8" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ShareRepurchaseProgramType1Domain" xlink:label="loc_cae_ShareRepurchaseProgramType1Domain_F4BB48F65B27EF6D87A4FF7C21BD0531_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cae_ShareRepurchaseProgramType1Axis_EB826957506F5E3C40C9FF7C21BD0CC8" xlink:to="loc_cae_ShareRepurchaseProgramType1Domain_F4BB48F65B27EF6D87A4FF7C21BD0531_default" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_ShareRepurchaseProgramType1Domain" xlink:label="loc_cae_ShareRepurchaseProgramType1Domain_F4BB48F65B27EF6D87A4FF7C21BD0531" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cae_ShareRepurchaseProgramType1Axis_EB826957506F5E3C40C9FF7C21BD0CC8" xlink:to="loc_cae_ShareRepurchaseProgramType1Domain_F4BB48F65B27EF6D87A4FF7C21BD0531" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_PrivateShareRepurchaseAgreementMember" xlink:label="loc_cae_PrivateShareRepurchaseAgreementMember_8273CDB3F02D2E170924FF7C21BD8807" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cae_ShareRepurchaseProgramType1Domain_F4BB48F65B27EF6D87A4FF7C21BD0531" xlink:to="loc_cae_PrivateShareRepurchaseAgreementMember_8273CDB3F02D2E170924FF7C21BD8807" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_StockRepurchaseProgramNumberofSharesAuthorizedtobeRepurchased1" xlink:label="loc_cae_StockRepurchaseProgramNumberofSharesAuthorizedtobeRepurchased1_3CB299C0AD69FF9755C5FF7C21BE56F6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EarningsPerShareLineItems_DE1797C751CAE7689A3BFF7C21BDF93C" xlink:to="loc_cae_StockRepurchaseProgramNumberofSharesAuthorizedtobeRepurchased1_3CB299C0AD69FF9755C5FF7C21BE56F6" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_StockRepurchasedandRetiredDuringPeriodShares1" xlink:label="loc_cae_StockRepurchasedandRetiredDuringPeriodShares1_81F843FE7A816EB3F3FDFF7C21BEA3C4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EarningsPerShareLineItems_DE1797C751CAE7689A3BFF7C21BDF93C" xlink:to="loc_cae_StockRepurchasedandRetiredDuringPeriodShares1_81F843FE7A816EB3F3FDFF7C21BEA3C4" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_StockRepurchasedandRetiredDuringPeriodPerShare" xlink:label="loc_cae_StockRepurchasedandRetiredDuringPeriodPerShare_32B79863242897971688FF7C21BE765F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EarningsPerShareLineItems_DE1797C751CAE7689A3BFF7C21BDF93C" xlink:to="loc_cae_StockRepurchasedandRetiredDuringPeriodPerShare_32B79863242897971688FF7C21BE765F" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_StockRepurchasedandRetiredDuringPeriodValue1" xlink:label="loc_cae_StockRepurchasedandRetiredDuringPeriodValue1_BCC2E9493D023FF640B3FF7C21BF3478" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EarningsPerShareLineItems_DE1797C751CAE7689A3BFF7C21BDF93C" xlink:to="loc_cae_StockRepurchasedandRetiredDuringPeriodValue1_BCC2E9493D023FF640B3FF7C21BF3478" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.ifrs.org/taxonomy/2017-03-09/full_ifrs/full_ifrs-cor_2017-03-09.xsd#ifrs-full_NumberOfSharesIssuedAndFullyPaid" xlink:label="loc_ifrs-full_NumberOfSharesIssuedAndFullyPaid_92C60A49200E530DCD26FF7C21BFBB9C" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EarningsPerShareLineItems_DE1797C751CAE7689A3BFF7C21BDF93C" xlink:to="loc_ifrs-full_NumberOfSharesIssuedAndFullyPaid_92C60A49200E530DCD26FF7C21BFBB9C" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_AntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareShares" xlink:label="loc_cae_AntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareShares_4271660B7566452A943EFF7C21BFAA70" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EarningsPerShareLineItems_DE1797C751CAE7689A3BFF7C21BDF93C" xlink:to="loc_cae_AntidilutiveSecuritiesExcludedfromComputationofEarningsPerShareShares_4271660B7566452A943EFF7C21BFAA70" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_DividendsDeclared" xlink:label="loc_cae_DividendsDeclared_4B651485463EA926E434FF7C21BF9F8C" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EarningsPerShareLineItems_DE1797C751CAE7689A3BFF7C21BDF93C" xlink:to="loc_cae_DividendsDeclared_4B651485463EA926E434FF7C21BF9F8C" xlink:type="arc" />
    <link:loc xlink:href="cae-20180331.xsd#cae_CommonStockDividendsDeclaredPerShare" xlink:label="loc_cae_CommonStockDividendsDeclaredPerShare_E71C420A91DBD6FE507CFF7C21BFB515" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EarningsPerShareLineItems_DE1797C751CAE7689A3BFF7C21BDF93C" xlink:to="loc_cae_CommonStockDividendsDeclaredPerShare_E71C420A91DBD6FE507CFF7C21BFB515" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cae.com/role/ShareCapitalEarningsPerShareAndDividendsEarningsPerShareComputationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/ShareCapitalEarningsPerShareAndDividendsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/SupplementaryCashFlowsInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/SupplementaryCashFlowsInformationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cae.com/role/SupplementaryCashFlowsInformationTables" xlink:type="extended" />
</link:linkbase>
