<?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.cabotog.com/role/AdditionalBalanceSheetInformation" xlink:href="cog-20180630.xsd#AdditionalBalanceSheetInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/AdditionalBalanceSheetInformationScheduleOfAdditionalBalanceSheetInformationDetails" xlink:href="cog-20180630.xsd#AdditionalBalanceSheetInformationScheduleOfAdditionalBalanceSheetInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/AdditionalBalanceSheetInformationTables" xlink:href="cog-20180630.xsd#AdditionalBalanceSheetInformationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/AssetRetirementObligations" xlink:href="cog-20180630.xsd#AssetRetirementObligations" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/AssetRetirementObligationsNarrativeDetails" xlink:href="cog-20180630.xsd#AssetRetirementObligationsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/AssetRetirementObligationsScheduleOfAroDetails" xlink:href="cog-20180630.xsd#AssetRetirementObligationsScheduleOfAroDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/AssetRetirementObligationsTables" xlink:href="cog-20180630.xsd#AssetRetirementObligationsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/CapitalStock" xlink:href="cog-20180630.xsd#CapitalStock" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/CapitalStockNarrativeDetails" xlink:href="cog-20180630.xsd#CapitalStockNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/CommitmentsAndContingencies" xlink:href="cog-20180630.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/CondensedConsolidatedBalanceSheetUnaudited" xlink:href="cog-20180630.xsd#CondensedConsolidatedBalanceSheetUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/CondensedConsolidatedBalanceSheetUnauditedParenthetical" xlink:href="cog-20180630.xsd#CondensedConsolidatedBalanceSheetUnauditedParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/CondensedConsolidatedStatementOfCashFlowsUnaudited" xlink:href="cog-20180630.xsd#CondensedConsolidatedStatementOfCashFlowsUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/CondensedConsolidatedStatementOfOperationsUnaudited" xlink:href="cog-20180630.xsd#CondensedConsolidatedStatementOfOperationsUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/DebtAndCreditAgreements" xlink:href="cog-20180630.xsd#DebtAndCreditAgreements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/DebtAndCreditAgreementsNarrativeDetails" xlink:href="cog-20180630.xsd#DebtAndCreditAgreementsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/DebtAndCreditAgreementsScheduleOfDebtDetails" xlink:href="cog-20180630.xsd#DebtAndCreditAgreementsScheduleOfDebtDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/DebtAndCreditAgreementsTables" xlink:href="cog-20180630.xsd#DebtAndCreditAgreementsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/DerivativeInstrumentsAndHedgingActivities" xlink:href="cog-20180630.xsd#DerivativeInstrumentsAndHedgingActivities" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/DerivativeInstrumentsAndHedgingActivitiesEffectOfDerivativeInstrumentsOnCondensedConsolidatedBalanceSheetDetails" xlink:href="cog-20180630.xsd#DerivativeInstrumentsAndHedgingActivitiesEffectOfDerivativeInstrumentsOnCondensedConsolidatedBalanceSheetDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/DerivativeInstrumentsAndHedgingActivitiesEffectOfDerivativeInstrumentsOnCondensedConsolidatedStatementOfOperationsDetails" xlink:href="cog-20180630.xsd#DerivativeInstrumentsAndHedgingActivitiesEffectOfDerivativeInstrumentsOnCondensedConsolidatedStatementOfOperationsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/DerivativeInstrumentsAndHedgingActivitiesOffsettingOfDerivativeAssetsAndLiabilitiesInCondensedConsolidatedBalanceSheetDetails" xlink:href="cog-20180630.xsd#DerivativeInstrumentsAndHedgingActivitiesOffsettingOfDerivativeAssetsAndLiabilitiesInCondensedConsolidatedBalanceSheetDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/DerivativeInstrumentsAndHedgingActivitiesOutstandingCommodityDerivativesDetails" xlink:href="cog-20180630.xsd#DerivativeInstrumentsAndHedgingActivitiesOutstandingCommodityDerivativesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/DerivativeInstrumentsAndHedgingActivitiesTables" xlink:href="cog-20180630.xsd#DerivativeInstrumentsAndHedgingActivitiesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/DocumentAndEntityInformation" xlink:href="cog-20180630.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/EarningsPerCommonShare" xlink:href="cog-20180630.xsd#EarningsPerCommonShare" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/EarningsPerCommonShareCalculationOfWeightedAverageSharesExcludedFromDilutedEpsDetails" xlink:href="cog-20180630.xsd#EarningsPerCommonShareCalculationOfWeightedAverageSharesExcludedFromDilutedEpsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/EarningsPerCommonShareScheduleOfEpsDetails" xlink:href="cog-20180630.xsd#EarningsPerCommonShareScheduleOfEpsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/EarningsPerCommonShareTables" xlink:href="cog-20180630.xsd#EarningsPerCommonShareTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/EquityMethodInvestments" xlink:href="cog-20180630.xsd#EquityMethodInvestments" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/EquityMethodInvestmentsActivityRelatedToEquityMethodInvestmentsDetails" xlink:href="cog-20180630.xsd#EquityMethodInvestmentsActivityRelatedToEquityMethodInvestmentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/EquityMethodInvestmentsTables" xlink:href="cog-20180630.xsd#EquityMethodInvestmentsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/FairValueMeasurements" xlink:href="cog-20180630.xsd#FairValueMeasurements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/FairValueMeasurementsFairValueOfOtherFinancialInstrumentsDetails" xlink:href="cog-20180630.xsd#FairValueMeasurementsFairValueOfOtherFinancialInstrumentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/FairValueMeasurementsFinancialAssetsAndLiabilitiesRecurringDetails" xlink:href="cog-20180630.xsd#FairValueMeasurementsFinancialAssetsAndLiabilitiesRecurringDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/FairValueMeasurementsNarrativeDetails" xlink:href="cog-20180630.xsd#FairValueMeasurementsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/FairValueMeasurementsReconciliationOfChangesInFairValueOfFinancialAssetsAndLiabilitiesDetails" xlink:href="cog-20180630.xsd#FairValueMeasurementsReconciliationOfChangesInFairValueOfFinancialAssetsAndLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/FairValueMeasurementsTables" xlink:href="cog-20180630.xsd#FairValueMeasurementsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/FinancialStatementPresentation" xlink:href="cog-20180630.xsd#FinancialStatementPresentation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/FinancialStatementPresentationDisaggregationOfRevenueDetails" xlink:href="cog-20180630.xsd#FinancialStatementPresentationDisaggregationOfRevenueDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/FinancialStatementPresentationNarrativeDetails" xlink:href="cog-20180630.xsd#FinancialStatementPresentationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/FinancialStatementPresentationPolicies" xlink:href="cog-20180630.xsd#FinancialStatementPresentationPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/FinancialStatementPresentationTables" xlink:href="cog-20180630.xsd#FinancialStatementPresentationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/IncomeTaxes" xlink:href="cog-20180630.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/IncomeTaxesNarrativeDetails" xlink:href="cog-20180630.xsd#IncomeTaxesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/PropertiesAndEquipmentNet" xlink:href="cog-20180630.xsd#PropertiesAndEquipmentNet" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/PropertiesAndEquipmentNetNarrativeDetails" xlink:href="cog-20180630.xsd#PropertiesAndEquipmentNetNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/PropertiesAndEquipmentNetScheduleOfPropertyAndEquipmentNetDetails" xlink:href="cog-20180630.xsd#PropertiesAndEquipmentNetScheduleOfPropertyAndEquipmentNetDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/PropertiesAndEquipmentNetTables" xlink:href="cog-20180630.xsd#PropertiesAndEquipmentNetTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/StockBasedCompensation" xlink:href="cog-20180630.xsd#StockBasedCompensation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/StockBasedCompensationAssumptionsForTsrSharesDetails" xlink:href="cog-20180630.xsd#StockBasedCompensationAssumptionsForTsrSharesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/StockBasedCompensationNarrativeDetails" xlink:href="cog-20180630.xsd#StockBasedCompensationNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.cabotog.com/role/StockBasedCompensationTables" xlink:href="cog-20180630.xsd#StockBasedCompensationTables" 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.cabotog.com/role/AdditionalBalanceSheetInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/AdditionalBalanceSheetInformationScheduleOfAdditionalBalanceSheetInformationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/AdditionalBalanceSheetInformationTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/AssetRetirementObligations" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/AssetRetirementObligationsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_40A9E5E1A816C96933F15BBC1635CE16" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_B1820183616765DE8BB65BBC16347BD4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_40A9E5E1A816C96933F15BBC1635CE16" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_B1820183616765DE8BB65BBC16347BD4" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_53DE044E003789FE61ED5BBC16343B36" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_B1820183616765DE8BB65BBC16347BD4" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_53DE044E003789FE61ED5BBC16343B36" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_895D01DDF39AF73AD7885BBC1634C4C0_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_53DE044E003789FE61ED5BBC16343B36" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_895D01DDF39AF73AD7885BBC1634C4C0_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_895D01DDF39AF73AD7885BBC1634C4C0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_53DE044E003789FE61ED5BBC16343B36" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_895D01DDF39AF73AD7885BBC1634C4C0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccruedLiabilitiesMember" xlink:label="loc_us-gaap_AccruedLiabilitiesMember_00B23835E830512421D45BBC1635A722" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_895D01DDF39AF73AD7885BBC1634C4C0" xlink:to="loc_us-gaap_AccruedLiabilitiesMember_00B23835E830512421D45BBC1635A722" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetRetirementObligationCurrent" xlink:label="loc_us-gaap_AssetRetirementObligationCurrent_D5A29FBCDD853C898E875BBC1635B7BF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_40A9E5E1A816C96933F15BBC1635CE16" xlink:to="loc_us-gaap_AssetRetirementObligationCurrent_D5A29FBCDD853C898E875BBC1635B7BF" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cabotog.com/role/AssetRetirementObligationsScheduleOfAroDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/AssetRetirementObligationsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/CapitalStock" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/CapitalStockNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventLineItems" xlink:label="loc_us-gaap_SubsequentEventLineItems_A501D7671066F7D4EA6CD7B284A6AD9C" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTable" xlink:label="loc_us-gaap_SubsequentEventTable_2F796DBA9E5754756C45D7B284A6621E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_A501D7671066F7D4EA6CD7B284A6AD9C" xlink:to="loc_us-gaap_SubsequentEventTable_2F796DBA9E5754756C45D7B284A6621E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_5BDD1691BEA2DEC649F7D7B284A63E67" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_2F796DBA9E5754756C45D7B284A6621E" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_5BDD1691BEA2DEC649F7D7B284A63E67" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_E8B7FA3E2659AD60F085D7B284A6EAFF_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_5BDD1691BEA2DEC649F7D7B284A63E67" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_E8B7FA3E2659AD60F085D7B284A6EAFF_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_E8B7FA3E2659AD60F085D7B284A6EAFF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_5BDD1691BEA2DEC649F7D7B284A63E67" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_E8B7FA3E2659AD60F085D7B284A6EAFF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_325D690CC2621B702C01D7B284A61BB5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_E8B7FA3E2659AD60F085D7B284A6EAFF" xlink:to="loc_us-gaap_SubsequentEventMember_325D690CC2621B702C01D7B284A61BB5" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_StockRepurchaseProgramIncrementalNumberOfSharesAuthorizedToBeRepurchased" xlink:label="loc_cog_StockRepurchaseProgramIncrementalNumberOfSharesAuthorizedToBeRepurchased_AB19240AFE9C06C9C732D7B284A686DA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_A501D7671066F7D4EA6CD7B284A6AD9C" xlink:to="loc_cog_StockRepurchaseProgramIncrementalNumberOfSharesAuthorizedToBeRepurchased_AB19240AFE9C06C9C732D7B284A686DA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased" xlink:label="loc_us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_DD57C429394D6CB3C143D7B284A6C64A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_A501D7671066F7D4EA6CD7B284A6AD9C" xlink:to="loc_us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_DD57C429394D6CB3C143D7B284A6C64A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TreasuryStockSharesAcquired" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_8C36C40E89D4A9DB2370D7B284A6E558" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_A501D7671066F7D4EA6CD7B284A6AD9C" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_8C36C40E89D4A9DB2370D7B284A6E558" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodValue" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_44BE48C16D5E866BCA12D7B284A6D1EB" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_A501D7671066F7D4EA6CD7B284A6AD9C" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_44BE48C16D5E866BCA12D7B284A6D1EB" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cabotog.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/CondensedConsolidatedBalanceSheetUnaudited" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/CondensedConsolidatedBalanceSheetUnauditedParenthetical" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/CondensedConsolidatedStatementOfCashFlowsUnaudited" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/CondensedConsolidatedStatementOfOperationsUnaudited" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_9C67265FA10FB4C4947AA515FD9CE80A" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_207E76A83FB60921D38CA515FD99DB84" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_9C67265FA10FB4C4947AA515FD9CE80A" xlink:to="loc_us-gaap_StatementTable_207E76A83FB60921D38CA515FD99DB84" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RestatementAxis" xlink:label="loc_srt_RestatementAxis_65068155D7BD6EEDA8E1A515FD9AA67E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_207E76A83FB60921D38CA515FD99DB84" xlink:to="loc_srt_RestatementAxis_65068155D7BD6EEDA8E1A515FD9AA67E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RestatementDomain" xlink:label="loc_srt_RestatementDomain_E2A6A5B979A074442295A515FD9A27C4_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_65068155D7BD6EEDA8E1A515FD9AA67E" xlink:to="loc_srt_RestatementDomain_E2A6A5B979A074442295A515FD9A27C4_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RestatementDomain" xlink:label="loc_srt_RestatementDomain_E2A6A5B979A074442295A515FD9A27C4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_65068155D7BD6EEDA8E1A515FD9AA67E" xlink:to="loc_srt_RestatementDomain_E2A6A5B979A074442295A515FD9A27C4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_AB58992C95D4FC56A656A515FD9A3341" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_207E76A83FB60921D38CA515FD99DB84" xlink:to="loc_srt_ProductOrServiceAxis_AB58992C95D4FC56A656A515FD9A3341" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_540DF1314B131F261EB7A515FD9BBB05_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_AB58992C95D4FC56A656A515FD9A3341" xlink:to="loc_srt_ProductsAndServicesDomain_540DF1314B131F261EB7A515FD9BBB05_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_540DF1314B131F261EB7A515FD9BBB05" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_AB58992C95D4FC56A656A515FD9A3341" xlink:to="loc_srt_ProductsAndServicesDomain_540DF1314B131F261EB7A515FD9BBB05" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NaturalGasProductionMember" xlink:label="loc_us-gaap_NaturalGasProductionMember_53BE06BFB5B3395DADA2A515FD9BD24C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_540DF1314B131F261EB7A515FD9BBB05" xlink:to="loc_us-gaap_NaturalGasProductionMember_53BE06BFB5B3395DADA2A515FD9BD24C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OilAndCondensateMember" xlink:label="loc_us-gaap_OilAndCondensateMember_129722C2D7D4F5D6F6F5A515FD9BB0D3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_540DF1314B131F261EB7A515FD9BBB05" xlink:to="loc_us-gaap_OilAndCondensateMember_129722C2D7D4F5D6F6F5A515FD9BB0D3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NaturalGasMidstreamMember" xlink:label="loc_us-gaap_NaturalGasMidstreamMember_8918A56A5499A67B166AA515FD9BE096" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_540DF1314B131F261EB7A515FD9BBB05" xlink:to="loc_us-gaap_NaturalGasMidstreamMember_8918A56A5499A67B166AA515FD9BE096" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_OilAndGasOtherMember" xlink:label="loc_cog_OilAndGasOtherMember_C4E6DDA550C1E049D268A515FD9B490E" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_540DF1314B131F261EB7A515FD9BBB05" xlink:to="loc_cog_OilAndGasOtherMember_C4E6DDA550C1E049D268A515FD9B490E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NaturalGasGatheringTransportationMarketingAndProcessingMember" xlink:label="loc_us-gaap_NaturalGasGatheringTransportationMarketingAndProcessingMember_DB1BD5CC74836481B5F8A515FD9CCFB7" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_540DF1314B131F261EB7A515FD9BBB05" xlink:to="loc_us-gaap_NaturalGasGatheringTransportationMarketingAndProcessingMember_DB1BD5CC74836481B5F8A515FD9CCFB7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_us-gaap_RevenuesAbstract_CB478207F655161319FCA515FD9C6E7F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9C67265FA10FB4C4947AA515FD9CE80A" xlink:to="loc_us-gaap_RevenuesAbstract_CB478207F655161319FCA515FD9C6E7F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_DDB52143CF9718F61468A515FD9D0BC8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_CB478207F655161319FCA515FD9C6E7F" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_DDB52143CF9718F61468A515FD9D0BC8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GainLossOnSaleOfDerivatives" xlink:label="loc_us-gaap_GainLossOnSaleOfDerivatives_02330095BA7AAECCFF50A515FD9DE620" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_CB478207F655161319FCA515FD9C6E7F" xlink:to="loc_us-gaap_GainLossOnSaleOfDerivatives_02330095BA7AAECCFF50A515FD9DE620" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_8323A01D5A549D06EF67A515FD9DBD60" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_CB478207F655161319FCA515FD9C6E7F" xlink:to="loc_us-gaap_Revenues_8323A01D5A549D06EF67A515FD9DBD60" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingExpensesAbstract" xlink:label="loc_us-gaap_OperatingExpensesAbstract_C00030F0D9D96F035289A515FD9D50CE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9C67265FA10FB4C4947AA515FD9CE80A" xlink:to="loc_us-gaap_OperatingExpensesAbstract_C00030F0D9D96F035289A515FD9D50CE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DirectOperatingCosts" xlink:label="loc_us-gaap_DirectOperatingCosts_805E70DAB4D55D5B7822A515FD9D81F1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_C00030F0D9D96F035289A515FD9D50CE" xlink:to="loc_us-gaap_DirectOperatingCosts_805E70DAB4D55D5B7822A515FD9D81F1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CostOfGoodsAndServicesSold" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_55D3F20670B8809618FDA515FD9E8D38" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_C00030F0D9D96F035289A515FD9D50CE" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_55D3F20670B8809618FDA515FD9E8D38" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TaxesExcludingIncomeAndExciseTaxes" xlink:label="loc_us-gaap_TaxesExcludingIncomeAndExciseTaxes_2AF9115B3FAAA1417D7BA515FD9E4DE7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_C00030F0D9D96F035289A515FD9D50CE" xlink:to="loc_us-gaap_TaxesExcludingIncomeAndExciseTaxes_2AF9115B3FAAA1417D7BA515FD9E4DE7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ExplorationExpense" xlink:label="loc_us-gaap_ExplorationExpense_AE0185015C8EFCC999D9A515FD9EDCC3" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_C00030F0D9D96F035289A515FD9D50CE" xlink:to="loc_us-gaap_ExplorationExpense_AE0185015C8EFCC999D9A515FD9EDCC3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_BEFA52DF1C6548080A17A515FD9EAB5C" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_C00030F0D9D96F035289A515FD9D50CE" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_BEFA52DF1C6548080A17A515FD9EAB5C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ImpairmentOfOilAndGasProperties" xlink:label="loc_us-gaap_ImpairmentOfOilAndGasProperties_AAF00D45145EBEBE78C5A515FD9EF3C2" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_C00030F0D9D96F035289A515FD9D50CE" xlink:to="loc_us-gaap_ImpairmentOfOilAndGasProperties_AAF00D45145EBEBE78C5A515FD9EF3C2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_F9B668C6DD101E6A7864A515FD9ECDAC" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_C00030F0D9D96F035289A515FD9D50CE" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_F9B668C6DD101E6A7864A515FD9ECDAC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingExpenses" xlink:label="loc_us-gaap_OperatingExpenses_C83A3647A92ECF868B0DA515FD9F1B71" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_C00030F0D9D96F035289A515FD9D50CE" xlink:to="loc_us-gaap_OperatingExpenses_C83A3647A92ECF868B0DA515FD9F1B71" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_10A4B269F5308B55F11DA515FD9FDEAD" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9C67265FA10FB4C4947AA515FD9CE80A" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_10A4B269F5308B55F11DA515FD9FDEAD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_DDB7B5D6CCE6C27867D2A515FD9FE5EF" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9C67265FA10FB4C4947AA515FD9CE80A" xlink:to="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_DDB7B5D6CCE6C27867D2A515FD9FE5EF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_857F863B0906D9855EAFA515FD9FAAA6" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9C67265FA10FB4C4947AA515FD9CE80A" xlink:to="loc_us-gaap_OperatingIncomeLoss_857F863B0906D9855EAFA515FD9FAAA6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestIncomeExpenseNet" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_15CC31394F8A8078FA41A515FD9F21B1" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9C67265FA10FB4C4947AA515FD9CE80A" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_15CC31394F8A8078FA41A515FD9F21B1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_BD4D626DA5D9BC080896A515FD9FFAB4" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9C67265FA10FB4C4947AA515FD9CE80A" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_BD4D626DA5D9BC080896A515FD9FFAB4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_C51B96B1B9F15163BA66A515FDA034F2" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9C67265FA10FB4C4947AA515FD9CE80A" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_C51B96B1B9F15163BA66A515FDA034F2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_362E8A967D05D7A274C7A515FDA0DFF2" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9C67265FA10FB4C4947AA515FD9CE80A" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_362E8A967D05D7A274C7A515FDA0DFF2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_3052F32E0F7806734E44A515FDA0F7C2" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9C67265FA10FB4C4947AA515FD9CE80A" xlink:to="loc_us-gaap_NetIncomeLoss_3052F32E0F7806734E44A515FDA0F7C2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_us-gaap_EarningsPerShareAbstract_AEAE25DEDAFBAB756DA7A515FDA02344" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9C67265FA10FB4C4947AA515FD9CE80A" xlink:to="loc_us-gaap_EarningsPerShareAbstract_AEAE25DEDAFBAB756DA7A515FDA02344" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_85211F0688514A10F453A515FDA0EF29" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_AEAE25DEDAFBAB756DA7A515FDA02344" xlink:to="loc_us-gaap_EarningsPerShareBasic_85211F0688514A10F453A515FDA0EF29" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_EE4B0444D2453E9E01D6A515FDA1C8D0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_AEAE25DEDAFBAB756DA7A515FDA02344" xlink:to="loc_us-gaap_EarningsPerShareDiluted_EE4B0444D2453E9E01D6A515FDA1C8D0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_ADCE2409C7F799B32B16A515FDA1D869" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9C67265FA10FB4C4947AA515FD9CE80A" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_ADCE2409C7F799B32B16A515FDA1D869" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_80807392C3604A415F43A515FDA1A44E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_ADCE2409C7F799B32B16A515FDA1D869" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_80807392C3604A415F43A515FDA1A44E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_88C83F97060F6315C39CA515FDA1A360" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_ADCE2409C7F799B32B16A515FDA1D869" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_88C83F97060F6315C39CA515FDA1A360" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockDividendsPerShareCashPaid" xlink:label="loc_us-gaap_CommonStockDividendsPerShareCashPaid_FE585B9475DA3E7A9049A515FDA2B36B" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_9C67265FA10FB4C4947AA515FD9CE80A" xlink:to="loc_us-gaap_CommonStockDividendsPerShareCashPaid_FE585B9475DA3E7A9049A515FDA2B36B" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cabotog.com/role/DebtAndCreditAgreements" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/DebtAndCreditAgreementsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_3007054C18E988E836B6AB053481A1B0" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_C3CF23F65AF9ACC89231AB05347E24B7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3007054C18E988E836B6AB053481A1B0" xlink:to="loc_us-gaap_DebtInstrumentTable_C3CF23F65AF9ACC89231AB05347E24B7" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_1CCAC6A801FEA8F78661AB05347E6313" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_C3CF23F65AF9ACC89231AB05347E24B7" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_1CCAC6A801FEA8F78661AB05347E6313" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_C7AF3DA134F95C2CF101AB05347E1B37_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_1CCAC6A801FEA8F78661AB05347E6313" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_C7AF3DA134F95C2CF101AB05347E1B37_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_C7AF3DA134F95C2CF101AB05347E1B37" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_1CCAC6A801FEA8F78661AB05347E6313" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_C7AF3DA134F95C2CF101AB05347E1B37" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_803422BBCCF203338CF6AB05347F6D31" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_C7AF3DA134F95C2CF101AB05347E1B37" xlink:to="loc_us-gaap_SubsequentEventMember_803422BBCCF203338CF6AB05347F6D31" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_265B559ACBF777B0CA44AB05347F13F7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_C3CF23F65AF9ACC89231AB05347E24B7" xlink:to="loc_us-gaap_DebtInstrumentAxis_265B559ACBF777B0CA44AB05347F13F7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_2A8F9033DCBD210E6150AB05347F0D6F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_265B559ACBF777B0CA44AB05347F13F7" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_2A8F9033DCBD210E6150AB05347F0D6F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_2A8F9033DCBD210E6150AB05347F0D6F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_265B559ACBF777B0CA44AB05347F13F7" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_2A8F9033DCBD210E6150AB05347F0D6F" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_SixPointFiveOnePercentageWeightedAverageFixedRateNotesMember" xlink:label="loc_cog_SixPointFiveOnePercentageWeightedAverageFixedRateNotesMember_6374851DEC874B395B6FAB05347F1629" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_2A8F9033DCBD210E6150AB05347F0D6F" xlink:to="loc_cog_SixPointFiveOnePercentageWeightedAverageFixedRateNotesMember_6374851DEC874B395B6FAB05347F1629" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_274165AF77E3953E8508AB05348096D3" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_C3CF23F65AF9ACC89231AB05347E24B7" xlink:to="loc_us-gaap_CreditFacilityAxis_274165AF77E3953E8508AB05348096D3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_777FB55661EB424DB1C1AB053480D5EA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_274165AF77E3953E8508AB05348096D3" xlink:to="loc_us-gaap_CreditFacilityDomain_777FB55661EB424DB1C1AB053480D5EA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_777FB55661EB424DB1C1AB053480D5EA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_274165AF77E3953E8508AB05348096D3" xlink:to="loc_us-gaap_CreditFacilityDomain_777FB55661EB424DB1C1AB053480D5EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="loc_us-gaap_LineOfCreditMember_25E16DDF96FF0C6E42D9AB053480F1AA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_777FB55661EB424DB1C1AB053480D5EA" xlink:to="loc_us-gaap_LineOfCreditMember_25E16DDF96FF0C6E42D9AB053480F1AA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_04BBB8B39C416455CA6FAB05348116AF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3007054C18E988E836B6AB053481A1B0" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_04BBB8B39C416455CA6FAB05348116AF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_D669E6CC09D1444A46B9AB053481BD6F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3007054C18E988E836B6AB053481A1B0" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_D669E6CC09D1444A46B9AB053481BD6F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_EABA3E652420D69A7569AB0534825E4B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3007054C18E988E836B6AB053481A1B0" xlink:to="loc_us-gaap_LineOfCredit_EABA3E652420D69A7569AB0534825E4B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RepaymentsOfSeniorDebt" xlink:label="loc_us-gaap_RepaymentsOfSeniorDebt_E9E3700C8CDA757C37AAAB0534828CEA" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3007054C18E988E836B6AB053481A1B0" xlink:to="loc_us-gaap_RepaymentsOfSeniorDebt_E9E3700C8CDA757C37AAAB0534828CEA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtWeightedAverageInterestRate" xlink:label="loc_us-gaap_LongtermDebtWeightedAverageInterestRate_09FA18AC4FC51B9D58E3AB053482D1D7" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3007054C18E988E836B6AB053481A1B0" xlink:to="loc_us-gaap_LongtermDebtWeightedAverageInterestRate_09FA18AC4FC51B9D58E3AB053482D1D7" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cabotog.com/role/DebtAndCreditAgreementsScheduleOfDebtDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_87E3265C4DE00085A1BB5BBC15064E3E" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_47CE009947BC655E24415BBC15046A81" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_87E3265C4DE00085A1BB5BBC15064E3E" xlink:to="loc_us-gaap_DebtInstrumentTable_47CE009947BC655E24415BBC15046A81" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_B17FEABA69C33FD8E9CB5BBC1504FAFA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_47CE009947BC655E24415BBC15046A81" xlink:to="loc_us-gaap_CreditFacilityAxis_B17FEABA69C33FD8E9CB5BBC1504FAFA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_60420B14889A543EF6105BBC15047929_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_B17FEABA69C33FD8E9CB5BBC1504FAFA" xlink:to="loc_us-gaap_CreditFacilityDomain_60420B14889A543EF6105BBC15047929_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_60420B14889A543EF6105BBC15047929" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_B17FEABA69C33FD8E9CB5BBC1504FAFA" xlink:to="loc_us-gaap_CreditFacilityDomain_60420B14889A543EF6105BBC15047929" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="loc_us-gaap_LineOfCreditMember_7C8374206499A9B629BB5BBC150460AA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_60420B14889A543EF6105BBC15047929" xlink:to="loc_us-gaap_LineOfCreditMember_7C8374206499A9B629BB5BBC150460AA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_4BE9E928E75582B4B8E85BBC15058A82" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_47CE009947BC655E24415BBC15046A81" xlink:to="loc_us-gaap_DebtInstrumentAxis_4BE9E928E75582B4B8E85BBC15058A82" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_6EA61459D509C42E0AE55BBC15050798_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_4BE9E928E75582B4B8E85BBC15058A82" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_6EA61459D509C42E0AE55BBC15050798_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_6EA61459D509C42E0AE55BBC15050798" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_4BE9E928E75582B4B8E85BBC15058A82" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_6EA61459D509C42E0AE55BBC15050798" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_SixPointFiveOnePercentageWeightedAverageFixedRateNotesMember" xlink:label="loc_cog_SixPointFiveOnePercentageWeightedAverageFixedRateNotesMember_5E95FAE0FA8B31C67FC65BBC15052458" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6EA61459D509C42E0AE55BBC15050798" xlink:to="loc_cog_SixPointFiveOnePercentageWeightedAverageFixedRateNotesMember_5E95FAE0FA8B31C67FC65BBC15052458" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_NinePointSevenEightPercentageNotesMember" xlink:label="loc_cog_NinePointSevenEightPercentageNotesMember_2903E56FD6257E65A9ED5BBC1505A2C0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6EA61459D509C42E0AE55BBC15050798" xlink:to="loc_cog_NinePointSevenEightPercentageNotesMember_2903E56FD6257E65A9ED5BBC1505A2C0" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_FivePointFiveEightPercentageWeightedAverageFixedRateNotesMember" xlink:label="loc_cog_FivePointFiveEightPercentageWeightedAverageFixedRateNotesMember_D90030A85EE0E08725015BBC15069286" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6EA61459D509C42E0AE55BBC15050798" xlink:to="loc_cog_FivePointFiveEightPercentageWeightedAverageFixedRateNotesMember_D90030A85EE0E08725015BBC15069286" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_ThreePointSixtyFivePercentageWeightedAverageFixedRateNoteMember" xlink:label="loc_cog_ThreePointSixtyFivePercentageWeightedAverageFixedRateNoteMember_9B94A2742214D42EC29B5BBC1506457E" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6EA61459D509C42E0AE55BBC15050798" xlink:to="loc_cog_ThreePointSixtyFivePercentageWeightedAverageFixedRateNoteMember_9B94A2742214D42EC29B5BBC1506457E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_621A7918D73A2FD8E1FA5BBC1506DB9B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_87E3265C4DE00085A1BB5BBC15064E3E" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_621A7918D73A2FD8E1FA5BBC1506DB9B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredFinanceCostsNet" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_7B77506E4EA8195298B55BBC150788A1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_87E3265C4DE00085A1BB5BBC15064E3E" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_7B77506E4EA8195298B55BBC150788A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_D1486F335A23A1480BFD5BBC150765C2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_87E3265C4DE00085A1BB5BBC15064E3E" xlink:to="loc_us-gaap_LongTermDebt_D1486F335A23A1480BFD5BBC150765C2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongtermDebtWeightedAverageInterestRate" xlink:label="loc_us-gaap_LongtermDebtWeightedAverageInterestRate_F2718B409D0EB0AB4DC75BBC1507E7A7" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_87E3265C4DE00085A1BB5BBC15064E3E" xlink:to="loc_us-gaap_LongtermDebtWeightedAverageInterestRate_F2718B409D0EB0AB4DC75BBC1507E7A7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_EEF790580C3BD9A10DAB5BBC15073969" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_87E3265C4DE00085A1BB5BBC15064E3E" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_EEF790580C3BD9A10DAB5BBC15073969" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_9020A3B7972398DA485C5BBC150752AD" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_87E3265C4DE00085A1BB5BBC15064E3E" xlink:to="loc_us-gaap_LongTermDebtCurrent_9020A3B7972398DA485C5BBC150752AD" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cabotog.com/role/DebtAndCreditAgreementsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/DerivativeInstrumentsAndHedgingActivities" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/DerivativeInstrumentsAndHedgingActivitiesEffectOfDerivativeInstrumentsOnCondensedConsolidatedBalanceSheetDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativesFairValueLineItems" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_3DB80CBE833E090DACD2CD1F852E105C" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeTable" xlink:label="loc_us-gaap_DerivativeTable_764D30DC34CC2C5BE0F1CD1F8526A59D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_3DB80CBE833E090DACD2CD1F852E105C" xlink:to="loc_us-gaap_DerivativeTable_764D30DC34CC2C5BE0F1CD1F8526A59D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_9556B8B5D012FB818471CD1F8527341B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_764D30DC34CC2C5BE0F1CD1F8526A59D" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_9556B8B5D012FB818471CD1F8527341B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_ED6484B9006B21D64D65CD1F85273428_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_9556B8B5D012FB818471CD1F8527341B" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_ED6484B9006B21D64D65CD1F85273428_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_ED6484B9006B21D64D65CD1F85273428" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_9556B8B5D012FB818471CD1F8527341B" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_ED6484B9006B21D64D65CD1F85273428" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_DerivativeInstrumentscurrentMember" xlink:label="loc_cog_DerivativeInstrumentscurrentMember_DC95CE868E9AE9E95035CD1F852B45E8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_ED6484B9006B21D64D65CD1F85273428" xlink:to="loc_cog_DerivativeInstrumentscurrentMember_DC95CE868E9AE9E95035CD1F852B45E8" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_DerivativeInstrumentsNoncurrentMember" xlink:label="loc_cog_DerivativeInstrumentsNoncurrentMember_3CC472C7A04931EAA1EECD1F85285206" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_ED6484B9006B21D64D65CD1F85273428" xlink:to="loc_cog_DerivativeInstrumentsNoncurrentMember_3CC472C7A04931EAA1EECD1F85285206" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_HedgingDesignationAxis" xlink:label="loc_us-gaap_HedgingDesignationAxis_68DC5E1A080932881CC8CD1F852C4B54" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_764D30DC34CC2C5BE0F1CD1F8526A59D" xlink:to="loc_us-gaap_HedgingDesignationAxis_68DC5E1A080932881CC8CD1F852C4B54" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_F421C52ABACB5DD3DB90CD1F852C9908_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_68DC5E1A080932881CC8CD1F852C4B54" xlink:to="loc_us-gaap_HedgingDesignationDomain_F421C52ABACB5DD3DB90CD1F852C9908_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_HedgingDesignationDomain" xlink:label="loc_us-gaap_HedgingDesignationDomain_F421C52ABACB5DD3DB90CD1F852C9908" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_68DC5E1A080932881CC8CD1F852C4B54" xlink:to="loc_us-gaap_HedgingDesignationDomain_F421C52ABACB5DD3DB90CD1F852C9908" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NondesignatedMember" xlink:label="loc_us-gaap_NondesignatedMember_70FCCF13AA8CCECC2DB1CD1F852D0E10" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_F421C52ABACB5DD3DB90CD1F852C9908" xlink:to="loc_us-gaap_NondesignatedMember_70FCCF13AA8CCECC2DB1CD1F852D0E10" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_E9D4C492CC50B9462B9CCD1F852DB548" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_764D30DC34CC2C5BE0F1CD1F8526A59D" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_E9D4C492CC50B9462B9CCD1F852DB548" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_C840B0906A4790210200CD1F852D0E52_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_E9D4C492CC50B9462B9CCD1F852DB548" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_C840B0906A4790210200CD1F852D0E52_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_C840B0906A4790210200CD1F852D0E52" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_E9D4C492CC50B9462B9CCD1F852DB548" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_C840B0906A4790210200CD1F852D0E52" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommodityContractMember" xlink:label="loc_us-gaap_CommodityContractMember_20920C93A04CA559B260CD1F852EC8D1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_C840B0906A4790210200CD1F852D0E52" xlink:to="loc_us-gaap_CommodityContractMember_20920C93A04CA559B260CD1F852EC8D1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeAssets" xlink:label="loc_us-gaap_DerivativeAssets_41D6E05380D2452A569ACD1F852EB1C5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_3DB80CBE833E090DACD2CD1F852E105C" xlink:to="loc_us-gaap_DerivativeAssets_41D6E05380D2452A569ACD1F852EB1C5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_F4D947FE8F2A3EC3EAE7CD1F852FED19" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_3DB80CBE833E090DACD2CD1F852E105C" xlink:to="loc_us-gaap_DerivativeLiabilities_F4D947FE8F2A3EC3EAE7CD1F852FED19" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cabotog.com/role/DerivativeInstrumentsAndHedgingActivitiesEffectOfDerivativeInstrumentsOnCondensedConsolidatedStatementOfOperationsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/DerivativeInstrumentsAndHedgingActivitiesOffsettingOfDerivativeAssetsAndLiabilitiesInCondensedConsolidatedBalanceSheetDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/DerivativeInstrumentsAndHedgingActivitiesOutstandingCommodityDerivativesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeLineItems" xlink:label="loc_us-gaap_DerivativeLineItems_9388361831494E07C28B5BBC14F94E75" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeTable" xlink:label="loc_us-gaap_DerivativeTable_812EF009B96F78F6BE2F5BBC14F7BF95" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_9388361831494E07C28B5BBC14F94E75" xlink:to="loc_us-gaap_DerivativeTable_812EF009B96F78F6BE2F5BBC14F7BF95" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_95EB50B458394B2EF1E85BBC14F72901" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_812EF009B96F78F6BE2F5BBC14F7BF95" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_95EB50B458394B2EF1E85BBC14F72901" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_BAD27E91AC28EDA04D7E5BBC14F76AC9_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_95EB50B458394B2EF1E85BBC14F72901" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_BAD27E91AC28EDA04D7E5BBC14F76AC9_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_BAD27E91AC28EDA04D7E5BBC14F76AC9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_95EB50B458394B2EF1E85BBC14F72901" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_BAD27E91AC28EDA04D7E5BBC14F76AC9" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_NaturalGasSwapWithContractPeriodOfApril2018ToDecember2018Member" xlink:label="loc_cog_NaturalGasSwapWithContractPeriodOfApril2018ToDecember2018Member_A07884A9E73F45E245415BBC14F8CDC9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_BAD27E91AC28EDA04D7E5BBC14F76AC9" xlink:to="loc_cog_NaturalGasSwapWithContractPeriodOfApril2018ToDecember2018Member_A07884A9E73F45E245415BBC14F8CDC9" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_NaturalGasSwap1WithContractPeriodOfApril2018ToDecember2018Member" xlink:label="loc_cog_NaturalGasSwap1WithContractPeriodOfApril2018ToDecember2018Member_E7A889E226AAC3D8EBC35BBC14F85F66" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_BAD27E91AC28EDA04D7E5BBC14F76AC9" xlink:to="loc_cog_NaturalGasSwap1WithContractPeriodOfApril2018ToDecember2018Member_E7A889E226AAC3D8EBC35BBC14F85F66" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_NaturalGasCollarWithContractPeriodOfApril2018ToDecember2018Member" xlink:label="loc_cog_NaturalGasCollarWithContractPeriodOfApril2018ToDecember2018Member_BC66BDFEFA6A2F36F5205BBC14F8E4DA" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_BAD27E91AC28EDA04D7E5BBC14F76AC9" xlink:to="loc_cog_NaturalGasCollarWithContractPeriodOfApril2018ToDecember2018Member_BC66BDFEFA6A2F36F5205BBC14F8E4DA" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_NaturalGasCollarWithContractPeriodOfApril2018ToOctober2018Member" xlink:label="loc_cog_NaturalGasCollarWithContractPeriodOfApril2018ToOctober2018Member_CD1DDABD5F99CF5BB5865BBC14F81AD1" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_BAD27E91AC28EDA04D7E5BBC14F76AC9" xlink:to="loc_cog_NaturalGasCollarWithContractPeriodOfApril2018ToOctober2018Member_CD1DDABD5F99CF5BB5865BBC14F81AD1" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_NaturalGasPurchaseWithContractPeriodOfApril2018ToOctober2018Member" xlink:label="loc_cog_NaturalGasPurchaseWithContractPeriodOfApril2018ToOctober2018Member_6340FF56A0AA6BC3B62F5BBC14F90BB1" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_BAD27E91AC28EDA04D7E5BBC14F76AC9" xlink:to="loc_cog_NaturalGasPurchaseWithContractPeriodOfApril2018ToOctober2018Member_6340FF56A0AA6BC3B62F5BBC14F90BB1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeNonmonetaryNotionalAmountVolume" xlink:label="loc_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_6B232BFE26B17656B9D05BBC14F9D448" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_9388361831494E07C28B5BBC14F94E75" xlink:to="loc_us-gaap_DerivativeNonmonetaryNotionalAmountVolume_6B232BFE26B17656B9D05BBC14F9D448" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeSwapTypeAverageFixedPrice" xlink:label="loc_us-gaap_DerivativeSwapTypeAverageFixedPrice_64AA7816134D74DF75E35BBC14F9CD89" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_9388361831494E07C28B5BBC14F94E75" xlink:to="loc_us-gaap_DerivativeSwapTypeAverageFixedPrice_64AA7816134D74DF75E35BBC14F9CD89" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cabotog.com/role/DerivativeInstrumentsAndHedgingActivitiesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/EarningsPerCommonShare" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/EarningsPerCommonShareCalculationOfWeightedAverageSharesExcludedFromDilutedEpsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_B8EF9FB6041C433175A85BBC152AAA86" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_45FD9AA374B0EF89EDC85BBC1529FE65" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_B8EF9FB6041C433175A85BBC152AAA86" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_45FD9AA374B0EF89EDC85BBC1529FE65" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_AAC32D4878132889C0425BBC1529C907" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_45FD9AA374B0EF89EDC85BBC1529FE65" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_AAC32D4878132889C0425BBC1529C907" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_36958FAC729E64882A895BBC15298EA5_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_AAC32D4878132889C0425BBC1529C907" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_36958FAC729E64882A895BBC15298EA5_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AntidilutiveSecuritiesNameDomain" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_36958FAC729E64882A895BBC15298EA5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_AAC32D4878132889C0425BBC1529C907" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_36958FAC729E64882A895BBC15298EA5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockCompensationPlanMember" xlink:label="loc_us-gaap_StockCompensationPlanMember_DBC68E3870745E6AF2C55BBC152AFCA1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_36958FAC729E64882A895BBC15298EA5" xlink:to="loc_us-gaap_StockCompensationPlanMember_DBC68E3870745E6AF2C55BBC152AFCA1" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_AntidilutiveSecuritiesExcludedfromComputationofEPSAmountTreasuryStockMethod" xlink:label="loc_cog_AntidilutiveSecuritiesExcludedfromComputationofEPSAmountTreasuryStockMethod_B11E7BAF9E7B5DA40B1E5BBC152A2C83" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_B8EF9FB6041C433175A85BBC152AAA86" xlink:to="loc_cog_AntidilutiveSecuritiesExcludedfromComputationofEPSAmountTreasuryStockMethod_B11E7BAF9E7B5DA40B1E5BBC152A2C83" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cabotog.com/role/EarningsPerCommonShareScheduleOfEpsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/EarningsPerCommonShareTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/EquityMethodInvestments" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/EquityMethodInvestmentsActivityRelatedToEquityMethodInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsLineItems" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_85ADD10648F2C9FC86CF5BBC1596F475" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfEquityMethodInvestmentsTable" xlink:label="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_C8ABAB0ECEA0643B56D15BBC15947EE1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_85ADD10648F2C9FC86CF5BBC1596F475" xlink:to="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_C8ABAB0ECEA0643B56D15BBC15947EE1" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherCommitmentsAxis" xlink:label="loc_us-gaap_OtherCommitmentsAxis_80B8E08527924B647D005BBC15948B61" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_C8ABAB0ECEA0643B56D15BBC15947EE1" xlink:to="loc_us-gaap_OtherCommitmentsAxis_80B8E08527924B647D005BBC15948B61" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherCommitmentsDomain" xlink:label="loc_us-gaap_OtherCommitmentsDomain_B9385847D1DB03E7C0FB5BBC1594F995_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_80B8E08527924B647D005BBC15948B61" xlink:to="loc_us-gaap_OtherCommitmentsDomain_B9385847D1DB03E7C0FB5BBC1594F995_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherCommitmentsDomain" xlink:label="loc_us-gaap_OtherCommitmentsDomain_B9385847D1DB03E7C0FB5BBC1594F995" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_80B8E08527924B647D005BBC15948B61" xlink:to="loc_us-gaap_OtherCommitmentsDomain_B9385847D1DB03E7C0FB5BBC1594F995" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_EquityMethodInvestmentCommitmentMember" xlink:label="loc_cog_EquityMethodInvestmentCommitmentMember_4A534329E8C822BED3265BBC159559D9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_B9385847D1DB03E7C0FB5BBC1594F995" xlink:to="loc_cog_EquityMethodInvestmentCommitmentMember_4A534329E8C822BED3265BBC159559D9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_00B63E14DABC9E05E5BD5BBC159516F8" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsTable_C8ABAB0ECEA0643B56D15BBC15947EE1" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_00B63E14DABC9E05E5BD5BBC159516F8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_EquityMethodInvesteeNameDomain" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_089366E15069C2B92F365BBC1595AC61_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_00B63E14DABC9E05E5BD5BBC159516F8" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_089366E15069C2B92F365BBC1595AC61_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_EquityMethodInvesteeNameDomain" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_089366E15069C2B92F365BBC1595AC61" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_00B63E14DABC9E05E5BD5BBC159516F8" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_089366E15069C2B92F365BBC1595AC61" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_ConstitutionPipelineCompanyLLCMember" xlink:label="loc_cog_ConstitutionPipelineCompanyLLCMember_03EC431A0F5B005A9BEB5BBC1595071B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_089366E15069C2B92F365BBC1595AC61" xlink:to="loc_cog_ConstitutionPipelineCompanyLLCMember_03EC431A0F5B005A9BEB5BBC1595071B" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_MeadePipelineCoLLCMember" xlink:label="loc_cog_MeadePipelineCoLLCMember_AE6FC411A3DEED476A845BBC1596FC65" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_089366E15069C2B92F365BBC1595AC61" xlink:to="loc_cog_MeadePipelineCoLLCMember_AE6FC411A3DEED476A845BBC1596FC65" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_9DB14C276855039E9A215BBC1596924A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_85ADD10648F2C9FC86CF5BBC1596F475" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_9DB14C276855039E9A215BBC1596924A" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_EquityMethodInvestmentsRollForward" xlink:label="loc_cog_EquityMethodInvestmentsRollForward_AF3F3CDB53A9782EE77A5BBC1596CEEE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_85ADD10648F2C9FC86CF5BBC1596F475" xlink:to="loc_cog_EquityMethodInvestmentsRollForward_AF3F3CDB53A9782EE77A5BBC1596CEEE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityMethodInvestments" xlink:label="loc_us-gaap_EquityMethodInvestments_D19E480D0277AD1D374A5BBC15974CB1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cog_EquityMethodInvestmentsRollForward_AF3F3CDB53A9782EE77A5BBC1596CEEE" xlink:to="loc_us-gaap_EquityMethodInvestments_D19E480D0277AD1D374A5BBC15974CB1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PaymentsToAcquireEquityMethodInvestments" xlink:label="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_7CD2B8EB9CAF298154685BBC15970E60" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cog_EquityMethodInvestmentsRollForward_AF3F3CDB53A9782EE77A5BBC1596CEEE" xlink:to="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_7CD2B8EB9CAF298154685BBC15970E60" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_33097FF0C34D05F5486D5BBC15971260" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cog_EquityMethodInvestmentsRollForward_AF3F3CDB53A9782EE77A5BBC1596CEEE" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_33097FF0C34D05F5486D5BBC15971260" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OtherCommitmentsFutureMinimumPaymentsRemainderOfFiscalYear" xlink:label="loc_us-gaap_OtherCommitmentsFutureMinimumPaymentsRemainderOfFiscalYear_E045E835D00A4F821EB75BBC1597A8F3" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_85ADD10648F2C9FC86CF5BBC1596F475" xlink:to="loc_us-gaap_OtherCommitmentsFutureMinimumPaymentsRemainderOfFiscalYear_E045E835D00A4F821EB75BBC1597A8F3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity" xlink:label="loc_us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity_4FB1786287C36C7FC0385BBC15986651" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_85ADD10648F2C9FC86CF5BBC1596F475" xlink:to="loc_us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity_4FB1786287C36C7FC0385BBC15986651" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cabotog.com/role/EquityMethodInvestmentsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/FairValueMeasurements" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/FairValueMeasurementsFairValueOfOtherFinancialInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_2B55F6FAFA69BA65AC9D5BBC161ACD8B" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTable" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_C4FC2F2F13AD789BDBBB5BBC161859B8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_2B55F6FAFA69BA65AC9D5BBC161ACD8B" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_C4FC2F2F13AD789BDBBB5BBC161859B8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_A6809B002CF8D76C7D945BBC1618A4FF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_C4FC2F2F13AD789BDBBB5BBC161859B8" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_A6809B002CF8D76C7D945BBC1618A4FF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_168DEDBE0901A5B1D4835BBC1619BB1C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_A6809B002CF8D76C7D945BBC1618A4FF" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_168DEDBE0901A5B1D4835BBC1619BB1C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_C55EB8ED1CB49009FC235BBC16191418" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_A6809B002CF8D76C7D945BBC1618A4FF" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_C55EB8ED1CB49009FC235BBC16191418" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_168DEDBE0901A5B1D4835BBC1619BB1C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_C55EB8ED1CB49009FC235BBC16191418" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_168DEDBE0901A5B1D4835BBC1619BB1C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_BA26842ACDB3D0E00B3F5BBC1619C1F2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_C55EB8ED1CB49009FC235BBC16191418" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_BA26842ACDB3D0E00B3F5BBC1619C1F2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_2DD6C8521F61F4ED8D9A5BBC1619FEF8" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_C55EB8ED1CB49009FC235BBC16191418" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_2DD6C8521F61F4ED8D9A5BBC1619FEF8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_812557658FE2B882015C5BBC161A2338" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_2B55F6FAFA69BA65AC9D5BBC161ACD8B" xlink:to="loc_us-gaap_LongTermDebt_812557658FE2B882015C5BBC161A2338" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_ECB4C8E9DF3B87870A0E5BBC161A4046" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_2B55F6FAFA69BA65AC9D5BBC161ACD8B" xlink:to="loc_us-gaap_LongTermDebtCurrent_ECB4C8E9DF3B87870A0E5BBC161A4046" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_551283873F0E743D2F1D5BBC161A1184" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_2B55F6FAFA69BA65AC9D5BBC161ACD8B" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_551283873F0E743D2F1D5BBC161A1184" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cabotog.com/role/FairValueMeasurementsFinancialAssetsAndLiabilitiesRecurringDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_50FEEFA0B1ABDEDCD97F5BBC15858926" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_5F99B030B2D1EA4EB24B5BBC1583D1B7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_50FEEFA0B1ABDEDCD97F5BBC15858926" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_5F99B030B2D1EA4EB24B5BBC1583D1B7" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_16EA9ACA20D2B28531325BBC1583576B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_5F99B030B2D1EA4EB24B5BBC1583D1B7" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_16EA9ACA20D2B28531325BBC1583576B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_BE61C4365DFA40F9E2905BBC15832544_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_16EA9ACA20D2B28531325BBC1583576B" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_BE61C4365DFA40F9E2905BBC15832544_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_BE61C4365DFA40F9E2905BBC15832544" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_16EA9ACA20D2B28531325BBC1583576B" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_BE61C4365DFA40F9E2905BBC15832544" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_B222CE53E3D9CAF2E18F5BBC1584D108" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_BE61C4365DFA40F9E2905BBC15832544" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_B222CE53E3D9CAF2E18F5BBC1584D108" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_19895BA4919ABF0D474B5BBC15848875" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_BE61C4365DFA40F9E2905BBC15832544" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_19895BA4919ABF0D474B5BBC15848875" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_EC6CB913E8C9848C64AE5BBC15844FEF" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_BE61C4365DFA40F9E2905BBC15832544" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_EC6CB913E8C9848C64AE5BBC15844FEF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_7463703F5645EFAE52A45BBC15859C45" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_5F99B030B2D1EA4EB24B5BBC1583D1B7" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_7463703F5645EFAE52A45BBC15859C45" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_0CBCF493D47E1503A2785BBC158583A0_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_7463703F5645EFAE52A45BBC15859C45" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_0CBCF493D47E1503A2785BBC158583A0_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_0CBCF493D47E1503A2785BBC158583A0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_7463703F5645EFAE52A45BBC15859C45" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_0CBCF493D47E1503A2785BBC158583A0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_0CE8BA6BBAF98B12CB255BBC15850DAB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_0CBCF493D47E1503A2785BBC158583A0" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_0CE8BA6BBAF98B12CB255BBC15850DAB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetsFairValueDisclosureAbstract" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_F630983BA2BB06B041485BBC15851E03" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_50FEEFA0B1ABDEDCD97F5BBC15858926" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_F630983BA2BB06B041485BBC15851E03" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredCompensationPlanAssets" xlink:label="loc_us-gaap_DeferredCompensationPlanAssets_723500A03B9ADBAFABCF5BBC15866C66" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_F630983BA2BB06B041485BBC15851E03" xlink:to="loc_us-gaap_DeferredCompensationPlanAssets_723500A03B9ADBAFABCF5BBC15866C66" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_8381F76AC714053C69155BBC158652F1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_F630983BA2BB06B041485BBC15851E03" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_8381F76AC714053C69155BBC158652F1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetsFairValueDisclosure" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_32B9B71EDD3DEBE8937E5BBC1586BAC7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_F630983BA2BB06B041485BBC15851E03" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_32B9B71EDD3DEBE8937E5BBC1586BAC7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_16EFDE9328E4D46D2BA05BBC15865549" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_50FEEFA0B1ABDEDCD97F5BBC15858926" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_16EFDE9328E4D46D2BA05BBC15865549" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent" xlink:label="loc_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_018B5038066BF7E69B5F5BBC1586B86B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_16EFDE9328E4D46D2BA05BBC15865549" xlink:to="loc_us-gaap_DeferredCompensationLiabilityClassifiedNoncurrent_018B5038066BF7E69B5F5BBC1586B86B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DerivativeLiabilities" xlink:label="loc_us-gaap_DerivativeLiabilities_3718C8C4424CE760C0995BBC15871E58" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_16EFDE9328E4D46D2BA05BBC15865549" xlink:to="loc_us-gaap_DerivativeLiabilities_3718C8C4424CE760C0995BBC15871E58" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosure" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_C5CED135B9119F16633F5BBC15870256" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_16EFDE9328E4D46D2BA05BBC15865549" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_C5CED135B9119F16633F5BBC15870256" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cabotog.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/FairValueMeasurementsReconciliationOfChangesInFairValueOfFinancialAssetsAndLiabilitiesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/FairValueMeasurementsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/FinancialStatementPresentation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/FinancialStatementPresentationDisaggregationOfRevenueDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_0A17E0760D68E5173D2EA515FD282D24" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DisaggregationOfRevenueTable" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_C25D840D0B04DB08C25CA515FD263C9A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_0A17E0760D68E5173D2EA515FD282D24" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_C25D840D0B04DB08C25CA515FD263C9A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_D50886D848C50F520A63A515FD27FBE3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_C25D840D0B04DB08C25CA515FD263C9A" xlink:to="loc_srt_ProductOrServiceAxis_D50886D848C50F520A63A515FD27FBE3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_5AC6B5D2D776F151DF6AA515FD270112_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_D50886D848C50F520A63A515FD27FBE3" xlink:to="loc_srt_ProductsAndServicesDomain_5AC6B5D2D776F151DF6AA515FD270112_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_5AC6B5D2D776F151DF6AA515FD270112" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_D50886D848C50F520A63A515FD27FBE3" xlink:to="loc_srt_ProductsAndServicesDomain_5AC6B5D2D776F151DF6AA515FD270112" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_NaturalGasReservesMember" xlink:label="loc_srt_NaturalGasReservesMember_8782D3F2DD606CD9EA46A515FD272628" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_5AC6B5D2D776F151DF6AA515FD270112" xlink:to="loc_srt_NaturalGasReservesMember_8782D3F2DD606CD9EA46A515FD272628" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_CrudeOilAndCondensateRevenuesMember" xlink:label="loc_cog_CrudeOilAndCondensateRevenuesMember_BD45D71F4B0A4A5D5DDAA515FD28E008" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_5AC6B5D2D776F151DF6AA515FD270112" xlink:to="loc_cog_CrudeOilAndCondensateRevenuesMember_BD45D71F4B0A4A5D5DDAA515FD28E008" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_BrokeredNaturalGasMember" xlink:label="loc_cog_BrokeredNaturalGasMember_E599CBAF2DFB3CBB6563A515FD288489" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_5AC6B5D2D776F151DF6AA515FD270112" xlink:to="loc_cog_BrokeredNaturalGasMember_E599CBAF2DFB3CBB6563A515FD288489" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_OtherRevenuesMember" xlink:label="loc_cog_OtherRevenuesMember_0F0DB6F15D7048D8C859A515FD28D45C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_5AC6B5D2D776F151DF6AA515FD270112" xlink:to="loc_cog_OtherRevenuesMember_0F0DB6F15D7048D8C859A515FD28D45C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_032DF473B36A59712217A515FD2965F3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_0A17E0760D68E5173D2EA515FD282D24" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_032DF473B36A59712217A515FD2965F3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GainLossOnSaleOfDerivatives" xlink:label="loc_us-gaap_GainLossOnSaleOfDerivatives_BDAACD630B6F25C49BBEA515FD299AAF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_0A17E0760D68E5173D2EA515FD282D24" xlink:to="loc_us-gaap_GainLossOnSaleOfDerivatives_BDAACD630B6F25C49BBEA515FD299AAF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_Revenues" xlink:label="loc_us-gaap_Revenues_34F4C4739132DCB666BBA515FD2904D3" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_0A17E0760D68E5173D2EA515FD282D24" xlink:to="loc_us-gaap_Revenues_34F4C4739132DCB666BBA515FD2904D3" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cabotog.com/role/FinancialStatementPresentationNarrativeDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/FinancialStatementPresentationPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/FinancialStatementPresentationTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/IncomeTaxes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/PropertiesAndEquipmentNet" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/PropertiesAndEquipmentNetNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_406C46B19DB770EE6D95AB0534B724A9" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_4DECEF8430CD8EFCF89BAB0534B403DF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_406C46B19DB770EE6D95AB0534B724A9" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_4DECEF8430CD8EFCF89BAB0534B403DF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_C4B14C5D4C9A955266A5AB0534B4FA56" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_4DECEF8430CD8EFCF89BAB0534B403DF" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_C4B14C5D4C9A955266A5AB0534B4FA56" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_D5C51388DCE6E1A0ADFBAB0534B504A4_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_C4B14C5D4C9A955266A5AB0534B4FA56" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_D5C51388DCE6E1A0ADFBAB0534B504A4_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_D5C51388DCE6E1A0ADFBAB0534B504A4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_C4B14C5D4C9A955266A5AB0534B4FA56" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_D5C51388DCE6E1A0ADFBAB0534B504A4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_70178FAF672DB1498759AB0534B5AB8B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_D5C51388DCE6E1A0ADFBAB0534B504A4" xlink:to="loc_us-gaap_SubsequentEventMember_70178FAF672DB1498759AB0534B5AB8B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_StatementGeographicalAxis" xlink:label="loc_srt_StatementGeographicalAxis_07ABE875BC4E5AA3C243AB0534B5A0B3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_4DECEF8430CD8EFCF89BAB0534B403DF" xlink:to="loc_srt_StatementGeographicalAxis_07ABE875BC4E5AA3C243AB0534B5A0B3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_E3D2B1320EB5A70F1E75AB0534B66AE3_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_07ABE875BC4E5AA3C243AB0534B5A0B3" xlink:to="loc_srt_SegmentGeographicalDomain_E3D2B1320EB5A70F1E75AB0534B66AE3_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_SegmentGeographicalDomain" xlink:label="loc_srt_SegmentGeographicalDomain_E3D2B1320EB5A70F1E75AB0534B66AE3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_07ABE875BC4E5AA3C243AB0534B5A0B3" xlink:to="loc_srt_SegmentGeographicalDomain_E3D2B1320EB5A70F1E75AB0534B66AE3" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_HaynesvilleShaleMember" xlink:label="loc_cog_HaynesvilleShaleMember_70115AB27503C708233AAB0534B64B50" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_E3D2B1320EB5A70F1E75AB0534B66AE3" xlink:to="loc_cog_HaynesvilleShaleMember_70115AB27503C708233AAB0534B64B50" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_EastTexasMember" xlink:label="loc_cog_EastTexasMember_2C169638D40C1F672B7AAB0534B6FA93" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_E3D2B1320EB5A70F1E75AB0534B66AE3" xlink:to="loc_cog_EastTexasMember_2C169638D40C1F672B7AAB0534B6FA93" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_WestVirginiaVirginiaandOhioMember" xlink:label="loc_cog_WestVirginiaVirginiaandOhioMember_76CEF5D1758D7BF1A068AB0534B665C9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_E3D2B1320EB5A70F1E75AB0534B66AE3" xlink:to="loc_cog_WestVirginiaVirginiaandOhioMember_76CEF5D1758D7BF1A068AB0534B665C9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_5369A58ABA93B2533CA9AB0534B63047" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_4DECEF8430CD8EFCF89BAB0534B403DF" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_5369A58ABA93B2533CA9AB0534B63047" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9539D8C03AE1390B1F78AB0534B7FEFF_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_5369A58ABA93B2533CA9AB0534B63047" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9539D8C03AE1390B1F78AB0534B7FEFF_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9539D8C03AE1390B1F78AB0534B7FEFF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_5369A58ABA93B2533CA9AB0534B63047" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9539D8C03AE1390B1F78AB0534B7FEFF" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_OilandGasPropertiesProvedandUnprovedMember" xlink:label="loc_cog_OilandGasPropertiesProvedandUnprovedMember_4D590E5825406857C7D4AB0534B78903" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_9539D8C03AE1390B1F78AB0534B7FEFF" xlink:to="loc_cog_OilandGasPropertiesProvedandUnprovedMember_4D590E5825406857C7D4AB0534B78903" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_ABD429D39CE30750F50EAB0534B8C18D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_406C46B19DB770EE6D95AB0534B724A9" xlink:to="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_ABD429D39CE30750F50EAB0534B8C18D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ImpairmentOfOilAndGasProperties" xlink:label="loc_us-gaap_ImpairmentOfOilAndGasProperties_6430438929D02FD701C7AB0534B877D1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_406C46B19DB770EE6D95AB0534B724A9" xlink:to="loc_us-gaap_ImpairmentOfOilAndGasProperties_6430438929D02FD701C7AB0534B877D1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GainLossOnSaleOfPropertyPlantEquipment" xlink:label="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_8FDCA42AAE0112BA6035AB0534B85BA1" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_406C46B19DB770EE6D95AB0534B724A9" xlink:to="loc_us-gaap_GainLossOnSaleOfPropertyPlantEquipment_8FDCA42AAE0112BA6035AB0534B85BA1" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cabotog.com/role/PropertiesAndEquipmentNetScheduleOfPropertyAndEquipmentNetDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/PropertiesAndEquipmentNetTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/StockBasedCompensation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.cabotog.com/role/StockBasedCompensationAssumptionsForTsrSharesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_426A4F58EBFAE43A64D35BBC15223696" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_EAF1A114B417D0ACF7755BBC15204C4D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_426A4F58EBFAE43A64D35BBC15223696" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_EAF1A114B417D0ACF7755BBC15204C4D" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_78B9B98DF238260CF3055BBC1521F793" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_EAF1A114B417D0ACF7755BBC15204C4D" xlink:to="loc_srt_RangeAxis_78B9B98DF238260CF3055BBC1521F793" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_682A1FEAA67AEFE7D1675BBC15218BBC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_78B9B98DF238260CF3055BBC1521F793" xlink:to="loc_srt_RangeMember_682A1FEAA67AEFE7D1675BBC15218BBC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_682A1FEAA67AEFE7D1675BBC15218BBC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_78B9B98DF238260CF3055BBC1521F793" xlink:to="loc_srt_RangeMember_682A1FEAA67AEFE7D1675BBC15218BBC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_87B6C19C4A532B512E725BBC15210433" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_682A1FEAA67AEFE7D1675BBC15218BBC" xlink:to="loc_srt_MinimumMember_87B6C19C4A532B512E725BBC15210433" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_81B421C97A1FF27344A35BBC1522B2BB" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_682A1FEAA67AEFE7D1675BBC15218BBC" xlink:to="loc_srt_MaximumMember_81B421C97A1FF27344A35BBC1522B2BB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_0DEA7462DF3083877D9C5BBC15223772" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_EAF1A114B417D0ACF7755BBC15204C4D" xlink:to="loc_us-gaap_AwardTypeAxis_0DEA7462DF3083877D9C5BBC15223772" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BC0F8EFC7D75FAC07D135BBC1522B883_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_0DEA7462DF3083877D9C5BBC15223772" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BC0F8EFC7D75FAC07D135BBC1522B883_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BC0F8EFC7D75FAC07D135BBC1522B883" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_0DEA7462DF3083877D9C5BBC15223772" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BC0F8EFC7D75FAC07D135BBC1522B883" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_TSRPerformanceSharesMember" xlink:label="loc_cog_TSRPerformanceSharesMember_CD8F15211E520C2C4DBB5BBC152284C6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BC0F8EFC7D75FAC07D135BBC1522B883" xlink:to="loc_cog_TSRPerformanceSharesMember_CD8F15211E520C2C4DBB5BBC152284C6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_06487DF3242A27B115A55BBC1523D421" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_426A4F58EBFAE43A64D35BBC15223696" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_06487DF3242A27B115A55BBC1523D421" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_08692BDD67F2CF69166B5BBC1523DABE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_426A4F58EBFAE43A64D35BBC15223696" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_08692BDD67F2CF69166B5BBC1523DABE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_D9D62F480D9BD12E000D5BBC1523A2E6" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_426A4F58EBFAE43A64D35BBC15223696" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_D9D62F480D9BD12E000D5BBC1523A2E6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_21E6800EE08BFBE56FB15BBC1523B6A7" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_426A4F58EBFAE43A64D35BBC15223696" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_21E6800EE08BFBE56FB15BBC1523B6A7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_9076A5D5EC495317721E5BBC15236185" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_426A4F58EBFAE43A64D35BBC15223696" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_9076A5D5EC495317721E5BBC15236185" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_CCA26C5D9BDC4283D0B35BBC1524E6E1" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_426A4F58EBFAE43A64D35BBC15223696" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMinimum_CCA26C5D9BDC4283D0B35BBC1524E6E1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_384EB77566BDB151721B5BBC1524E9CF" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_426A4F58EBFAE43A64D35BBC15223696" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRateMaximum_384EB77566BDB151721B5BBC1524E9CF" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cabotog.com/role/StockBasedCompensationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F17DEDFB3E4F68B0E6FE60C8CDD8ACD9" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_47A75573679FFFF140F560C8CDCE2FF8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F17DEDFB3E4F68B0E6FE60C8CDD8ACD9" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_47A75573679FFFF140F560C8CDCE2FF8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_0DDA2592F87EE84EEDA860C8CDCEA213" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_47A75573679FFFF140F560C8CDCE2FF8" xlink:to="loc_us-gaap_AwardTypeAxis_0DDA2592F87EE84EEDA860C8CDCEA213" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BD5DBEE997B581637F9260C8CDCFEA8A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_0DDA2592F87EE84EEDA860C8CDCEA213" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BD5DBEE997B581637F9260C8CDCFEA8A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BD5DBEE997B581637F9260C8CDCFEA8A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_0DDA2592F87EE84EEDA860C8CDCEA213" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BD5DBEE997B581637F9260C8CDCFEA8A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_F681E315930E928858A760C8CDCF4270" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BD5DBEE997B581637F9260C8CDCFEA8A" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_F681E315930E928858A760C8CDCF4270" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PerformanceSharesMember" xlink:label="loc_us-gaap_PerformanceSharesMember_4708237959384196441860C8CDCF0E06" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BD5DBEE997B581637F9260C8CDCFEA8A" xlink:to="loc_us-gaap_PerformanceSharesMember_4708237959384196441860C8CDCF0E06" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_InternalMetricsPerformanceShareAwardsMember" xlink:label="loc_cog_InternalMetricsPerformanceShareAwardsMember_4D3941D62B7E06261B4060C8CDCFF716" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BD5DBEE997B581637F9260C8CDCFEA8A" xlink:to="loc_cog_InternalMetricsPerformanceShareAwardsMember_4D3941D62B7E06261B4060C8CDCFF716" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_EmployeePerformanceSharesMember" xlink:label="loc_cog_EmployeePerformanceSharesMember_CBA8D91BCD48448CA77860C8CDCF5537" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cog_InternalMetricsPerformanceShareAwardsMember_4D3941D62B7E06261B4060C8CDCFF716" xlink:to="loc_cog_EmployeePerformanceSharesMember_CBA8D91BCD48448CA77860C8CDCF5537" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_HybridPerformanceSharesMember" xlink:label="loc_cog_HybridPerformanceSharesMember_F4326D749435EF2460D060C8CDD0D155" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cog_InternalMetricsPerformanceShareAwardsMember_4D3941D62B7E06261B4060C8CDCFF716" xlink:to="loc_cog_HybridPerformanceSharesMember_F4326D749435EF2460D060C8CDD0D155" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_MarketBasedPerformanceShareAwardsMember" xlink:label="loc_cog_MarketBasedPerformanceShareAwardsMember_708927007A19B35DAA6960C8CDD04A6B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_BD5DBEE997B581637F9260C8CDCFEA8A" xlink:to="loc_cog_MarketBasedPerformanceShareAwardsMember_708927007A19B35DAA6960C8CDD04A6B" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_TSRPerformanceSharesMember" xlink:label="loc_cog_TSRPerformanceSharesMember_61AF182E267ACF240D7B60C8CDD0764B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cog_MarketBasedPerformanceShareAwardsMember_708927007A19B35DAA6960C8CDD04A6B" xlink:to="loc_cog_TSRPerformanceSharesMember_61AF182E267ACF240D7B60C8CDD0764B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_F3C9AF2E2C24181225F560C8CDD01710" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_47A75573679FFFF140F560C8CDCE2FF8" xlink:to="loc_srt_RangeAxis_F3C9AF2E2C24181225F560C8CDD01710" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_570E4294DABFE778DB0460C8CDD140EB_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_F3C9AF2E2C24181225F560C8CDD01710" xlink:to="loc_srt_RangeMember_570E4294DABFE778DB0460C8CDD140EB_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_570E4294DABFE778DB0460C8CDD140EB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_F3C9AF2E2C24181225F560C8CDD01710" xlink:to="loc_srt_RangeMember_570E4294DABFE778DB0460C8CDD140EB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_9FCE12442A7CEF0ED02C60C8CDD1D503" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_570E4294DABFE778DB0460C8CDD140EB" xlink:to="loc_srt_MinimumMember_9FCE12442A7CEF0ED02C60C8CDD1D503" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_7147148F6F2E7DF61D9860C8CDD16BB0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_570E4294DABFE778DB0460C8CDD140EB" xlink:to="loc_srt_MaximumMember_7147148F6F2E7DF61D9860C8CDD16BB0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VestingAxis" xlink:label="loc_us-gaap_VestingAxis_2ED6E44BB20CB1BD7F7B60C8CDD144DA" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_47A75573679FFFF140F560C8CDCE2FF8" xlink:to="loc_us-gaap_VestingAxis_2ED6E44BB20CB1BD7F7B60C8CDD144DA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaap_VestingDomain_34C0BF064B78C9EC80CB60C8CDD187DF_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VestingAxis_2ED6E44BB20CB1BD7F7B60C8CDD144DA" xlink:to="loc_us-gaap_VestingDomain_34C0BF064B78C9EC80CB60C8CDD187DF_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_VestingDomain" xlink:label="loc_us-gaap_VestingDomain_34C0BF064B78C9EC80CB60C8CDD187DF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VestingAxis_2ED6E44BB20CB1BD7F7B60C8CDD144DA" xlink:to="loc_us-gaap_VestingDomain_34C0BF064B78C9EC80CB60C8CDD187DF" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_SharebasedCompensationAwardShareAwardsPercentageVestingontheFirstServiceAnniversaryMember" xlink:label="loc_cog_SharebasedCompensationAwardShareAwardsPercentageVestingontheFirstServiceAnniversaryMember_566043FE02A5AE699F5E60C8CDD728B1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_34C0BF064B78C9EC80CB60C8CDD187DF" xlink:to="loc_cog_SharebasedCompensationAwardShareAwardsPercentageVestingontheFirstServiceAnniversaryMember_566043FE02A5AE699F5E60C8CDD728B1" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_SharebasedCompensationAwardShareAwardsPercentageVestingontheSecondServiceAnniversaryMember" xlink:label="loc_cog_SharebasedCompensationAwardShareAwardsPercentageVestingontheSecondServiceAnniversaryMember_86DCB712F50ABAC5BAF160C8CDD7BCF9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_34C0BF064B78C9EC80CB60C8CDD187DF" xlink:to="loc_cog_SharebasedCompensationAwardShareAwardsPercentageVestingontheSecondServiceAnniversaryMember_86DCB712F50ABAC5BAF160C8CDD7BCF9" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_SharebasedCompensationAwardShareAwardsPercentageVestingontheThirdServiceAnniversaryMember" xlink:label="loc_cog_SharebasedCompensationAwardShareAwardsPercentageVestingontheThirdServiceAnniversaryMember_A90EA48B600BCEA289AE60C8CDD749E1" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VestingDomain_34C0BF064B78C9EC80CB60C8CDD187DF" xlink:to="loc_cog_SharebasedCompensationAwardShareAwardsPercentageVestingontheThirdServiceAnniversaryMember_A90EA48B600BCEA289AE60C8CDD749E1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_F714F5F046DC7C015F6E60C8CDD8BAF8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F17DEDFB3E4F68B0E6FE60C8CDD8ACD9" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_F714F5F046DC7C015F6E60C8CDD8BAF8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_B59A7D349120BCC0CA2D60C8CDD81C98" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F17DEDFB3E4F68B0E6FE60C8CDD8ACD9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_B59A7D349120BCC0CA2D60C8CDD81C98" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_C515CA9EE7AE9464FEE260C8CDD8C090" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F17DEDFB3E4F68B0E6FE60C8CDD8ACD9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_C515CA9EE7AE9464FEE260C8CDD8C090" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitures" xlink:label="loc_cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitures_2EA33A115DDA0F8481D060C8CDD8D236" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F17DEDFB3E4F68B0E6FE60C8CDD8ACD9" xlink:to="loc_cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitures_2EA33A115DDA0F8481D060C8CDD8D236" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_ShareBasedCompensationArrangementByShareBasedCompensationAwardPercentageRightToReceiveAdditionalShares" xlink:label="loc_cog_ShareBasedCompensationArrangementByShareBasedCompensationAwardPercentageRightToReceiveAdditionalShares_58612BD676023F8552CB60C8CDD96858" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F17DEDFB3E4F68B0E6FE60C8CDD8ACD9" xlink:to="loc_cog_ShareBasedCompensationArrangementByShareBasedCompensationAwardPercentageRightToReceiveAdditionalShares_58612BD676023F8552CB60C8CDD96858" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_D2AC2B3C5FE361CA1B9960C8CDD976A3" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F17DEDFB3E4F68B0E6FE60C8CDD8ACD9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_D2AC2B3C5FE361CA1B9960C8CDD976A3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_49068AD6C5119A575A4C60C8CDD9ABE5" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F17DEDFB3E4F68B0E6FE60C8CDD8ACD9" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_49068AD6C5119A575A4C60C8CDD9ABE5" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsMinimumOperatingCashFlowRequirement" xlink:label="loc_cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsMinimumOperatingCashFlowRequirement_923D95AD813D6015DE1960C8CDD9F4B1" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F17DEDFB3E4F68B0E6FE60C8CDD8ACD9" xlink:to="loc_cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsMinimumOperatingCashFlowRequirement_923D95AD813D6015DE1960C8CDD9F4B1" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_ShareBasedCompensationArrangementByShareBasedCompensationAwardPercentageRightToReceiveShares" xlink:label="loc_cog_ShareBasedCompensationArrangementByShareBasedCompensationAwardPercentageRightToReceiveShares_55AB1DD617EDB42AF97C60C8CDD967FA" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F17DEDFB3E4F68B0E6FE60C8CDD8ACD9" xlink:to="loc_cog_ShareBasedCompensationArrangementByShareBasedCompensationAwardPercentageRightToReceiveShares_55AB1DD617EDB42AF97C60C8CDD967FA" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_ShareBasedCompensationArrangementByShareBasedCompensationAwardPercentageRightToReceiveCash" xlink:label="loc_cog_ShareBasedCompensationArrangementByShareBasedCompensationAwardPercentageRightToReceiveCash_27AE0F379F920C04652760C8CDD952F1" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F17DEDFB3E4F68B0E6FE60C8CDD8ACD9" xlink:to="loc_cog_ShareBasedCompensationArrangementByShareBasedCompensationAwardPercentageRightToReceiveCash_27AE0F379F920C04652760C8CDD952F1" xlink:type="arc" />
    <link:loc xlink:href="cog-20180630.xsd#cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod" xlink:label="loc_cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod_D91CB8B5C0BBBC91D17860C8CDDA3891" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_F17DEDFB3E4F68B0E6FE60C8CDD8ACD9" xlink:to="loc_cog_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformancePeriod_D91CB8B5C0BBBC91D17860C8CDDA3891" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.cabotog.com/role/StockBasedCompensationTables" xlink:type="extended" />
</link:linkbase>
