<?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.hcsgcorp.com/role/AccountsAndNotesReceivable" xlink:href="hcsg-20171231.xsd#AccountsAndNotesReceivable" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/AccountsAndNotesReceivableDetails" xlink:href="hcsg-20171231.xsd#AccountsAndNotesReceivableDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/AccruedInsuranceClaims" xlink:href="hcsg-20171231.xsd#AccruedInsuranceClaims" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/AccruedInsuranceClaimsDetails" xlink:href="hcsg-20171231.xsd#AccruedInsuranceClaimsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/AllowanceForDoubtfulAccounts" xlink:href="hcsg-20171231.xsd#AllowanceForDoubtfulAccounts" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/AllowanceForDoubtfulAccountsBadDebtProvisionsDetails" xlink:href="hcsg-20171231.xsd#AllowanceForDoubtfulAccountsBadDebtProvisionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/AllowanceForDoubtfulAccountsImpairedNotesReceivableDetails" xlink:href="hcsg-20171231.xsd#AllowanceForDoubtfulAccountsImpairedNotesReceivableDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/AllowanceForDoubtfulAccountsTables" xlink:href="hcsg-20171231.xsd#AllowanceForDoubtfulAccountsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ChangesInAccumulatedOtherComprehensiveIncomeByComponent" xlink:href="hcsg-20171231.xsd#ChangesInAccumulatedOtherComprehensiveIncomeByComponent" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ChangesInAccumulatedOtherComprehensiveIncomeByComponentReclassificationAdjustmentsDetails" xlink:href="hcsg-20171231.xsd#ChangesInAccumulatedOtherComprehensiveIncomeByComponentReclassificationAdjustmentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ChangesInAccumulatedOtherComprehensiveIncomeByComponentSummaryOfChangesDetails" xlink:href="hcsg-20171231.xsd#ChangesInAccumulatedOtherComprehensiveIncomeByComponentSummaryOfChangesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ChangesInAccumulatedOtherComprehensiveIncomeByComponentTables" xlink:href="hcsg-20171231.xsd#ChangesInAccumulatedOtherComprehensiveIncomeByComponentTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ConsolidatedBalanceSheets" xlink:href="hcsg-20171231.xsd#ConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:href="hcsg-20171231.xsd#ConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ConsolidatedStatementsOfCashFlows" xlink:href="hcsg-20171231.xsd#ConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:href="hcsg-20171231.xsd#ConsolidatedStatementsOfComprehensiveIncome" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ConsolidatedStatementsOfStockholdersEquity" xlink:href="hcsg-20171231.xsd#ConsolidatedStatementsOfStockholdersEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ContractualObligationsAndOtherContingencies" xlink:href="hcsg-20171231.xsd#ContractualObligationsAndOtherContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ContractualObligationsAndOtherContingenciesDetails" xlink:href="hcsg-20171231.xsd#ContractualObligationsAndOtherContingenciesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPolicies" xlink:href="hcsg-20171231.xsd#DescriptionOfBusinessAndSignificantAccountingPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesAdvertisingCostsDetails" xlink:href="hcsg-20171231.xsd#DescriptionOfBusinessAndSignificantAccountingPoliciesAdvertisingCostsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesConcentrationsOfCreditRiskAndSignificantClientsDetails" xlink:href="hcsg-20171231.xsd#DescriptionOfBusinessAndSignificantAccountingPoliciesConcentrationsOfCreditRiskAndSignificantClientsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesFairValueOfFinancialInstrumentsDetails" xlink:href="hcsg-20171231.xsd#DescriptionOfBusinessAndSignificantAccountingPoliciesFairValueOfFinancialInstrumentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesIdentifiableIntangibleAssetsAndGoodwillDetails" xlink:href="hcsg-20171231.xsd#DescriptionOfBusinessAndSignificantAccountingPoliciesIdentifiableIntangibleAssetsAndGoodwillDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesInvestmentsInMarketableSecuritiesAndInventoriesAndSuppliesDetails" xlink:href="hcsg-20171231.xsd#DescriptionOfBusinessAndSignificantAccountingPoliciesInvestmentsInMarketableSecuritiesAndInventoriesAndSuppliesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesNatureOfOperationsDetails" xlink:href="hcsg-20171231.xsd#DescriptionOfBusinessAndSignificantAccountingPoliciesNatureOfOperationsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesPolicies" xlink:href="hcsg-20171231.xsd#DescriptionOfBusinessAndSignificantAccountingPoliciesPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesPropertyAndEquipmentAndRevenueRecognitionDetails" xlink:href="hcsg-20171231.xsd#DescriptionOfBusinessAndSignificantAccountingPoliciesPropertyAndEquipmentAndRevenueRecognitionDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesRecentAccountingPronouncementsDetails" xlink:href="hcsg-20171231.xsd#DescriptionOfBusinessAndSignificantAccountingPoliciesRecentAccountingPronouncementsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/Dividends" xlink:href="hcsg-20171231.xsd#Dividends" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/DividendsAdditionalInformationDetails" xlink:href="hcsg-20171231.xsd#DividendsAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/DividendsCashDividendsPerCommonShareDetails" xlink:href="hcsg-20171231.xsd#DividendsCashDividendsPerCommonShareDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/DividendsQuarterlyDividendPaymentsDetails" xlink:href="hcsg-20171231.xsd#DividendsQuarterlyDividendPaymentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/DividendsTables" xlink:href="hcsg-20171231.xsd#DividendsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/DocumentAndEntityInformation" xlink:href="hcsg-20171231.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/EarningsPerCommonShare" xlink:href="hcsg-20171231.xsd#EarningsPerCommonShare" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/EarningsPerCommonShareDetails" xlink:href="hcsg-20171231.xsd#EarningsPerCommonShareDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/EarningsPerCommonShareTables" xlink:href="hcsg-20171231.xsd#EarningsPerCommonShareTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/FairValueMeasurements" xlink:href="hcsg-20171231.xsd#FairValueMeasurements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/FairValueMeasurementsAdditionalInformationDetails" xlink:href="hcsg-20171231.xsd#FairValueMeasurementsAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/FairValueMeasurementsContractualMaturitiesOfAvailableForSaleInvestmentsDetails" xlink:href="hcsg-20171231.xsd#FairValueMeasurementsContractualMaturitiesOfAvailableForSaleInvestmentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/FairValueMeasurementsMarketableDebtSecuritiesDetails" xlink:href="hcsg-20171231.xsd#FairValueMeasurementsMarketableDebtSecuritiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/FairValueMeasurementsMarketableSecuritiesAndDeferredCompensationFundInvestmentsDetails" xlink:href="hcsg-20171231.xsd#FairValueMeasurementsMarketableSecuritiesAndDeferredCompensationFundInvestmentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/FairValueMeasurementsTables" xlink:href="hcsg-20171231.xsd#FairValueMeasurementsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/GoodwillAndOtherIntangibleAssets" xlink:href="hcsg-20171231.xsd#GoodwillAndOtherIntangibleAssets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/GoodwillAndOtherIntangibleAssetsAdditionalInformationDetails" xlink:href="hcsg-20171231.xsd#GoodwillAndOtherIntangibleAssetsAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/GoodwillAndOtherIntangibleAssetsEstimatedAmortizationExpenseForIntangiblesSubjectToAmortizationDetails" xlink:href="hcsg-20171231.xsd#GoodwillAndOtherIntangibleAssetsEstimatedAmortizationExpenseForIntangiblesSubjectToAmortizationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/GoodwillAndOtherIntangibleAssetsTables" xlink:href="hcsg-20171231.xsd#GoodwillAndOtherIntangibleAssetsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/IncomeTaxes" xlink:href="hcsg-20171231.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/IncomeTaxesAdditionalInformationDetails" xlink:href="hcsg-20171231.xsd#IncomeTaxesAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/IncomeTaxesReconciliationOfProvisionForIncomeTaxesDetails" xlink:href="hcsg-20171231.xsd#IncomeTaxesReconciliationOfProvisionForIncomeTaxesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/IncomeTaxesSignificantComponentsOfFederalAndStateDeferredTaxAssetsAndLiabilitiesDetails" xlink:href="hcsg-20171231.xsd#IncomeTaxesSignificantComponentsOfFederalAndStateDeferredTaxAssetsAndLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/IncomeTaxesSummaryOfProvisionForIncomeTaxesDetails" xlink:href="hcsg-20171231.xsd#IncomeTaxesSummaryOfProvisionForIncomeTaxesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/IncomeTaxesTables" xlink:href="hcsg-20171231.xsd#IncomeTaxesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/LeaseCommitments" xlink:href="hcsg-20171231.xsd#LeaseCommitments" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/LeaseCommitmentsFutureMinimumLeasePaymentsUnderOperatingLeasesDetails" xlink:href="hcsg-20171231.xsd#LeaseCommitmentsFutureMinimumLeasePaymentsUnderOperatingLeasesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/LeaseCommitmentsOperatingLeaseExpenseDetails" xlink:href="hcsg-20171231.xsd#LeaseCommitmentsOperatingLeaseExpenseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/LeaseCommitmentsTables" xlink:href="hcsg-20171231.xsd#LeaseCommitmentsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/OtherEmployeeBenefitPlans" xlink:href="hcsg-20171231.xsd#OtherEmployeeBenefitPlans" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/OtherEmployeeBenefitPlansDetails" xlink:href="hcsg-20171231.xsd#OtherEmployeeBenefitPlansDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/PropertyAndEquipment" xlink:href="hcsg-20171231.xsd#PropertyAndEquipment" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/PropertyAndEquipmentDetails" xlink:href="hcsg-20171231.xsd#PropertyAndEquipmentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/PropertyAndEquipmentTables" xlink:href="hcsg-20171231.xsd#PropertyAndEquipmentTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/RelatedPartyTransactions" xlink:href="hcsg-20171231.xsd#RelatedPartyTransactions" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/RelatedPartyTransactionsDetails" xlink:href="hcsg-20171231.xsd#RelatedPartyTransactionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ScheduleIiValuationAndQualifyingAccountsAndReserves" xlink:href="hcsg-20171231.xsd#ScheduleIiValuationAndQualifyingAccountsAndReserves" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ScheduleIiValuationAndQualifyingAccountsAndReservesDetails" xlink:href="hcsg-20171231.xsd#ScheduleIiValuationAndQualifyingAccountsAndReservesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/SegmentInformation" xlink:href="hcsg-20171231.xsd#SegmentInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/SegmentInformationAdditionalInformationDetails" xlink:href="hcsg-20171231.xsd#SegmentInformationAdditionalInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/SegmentInformationScheduleOfInformationOfReportableSegmentsDetails" xlink:href="hcsg-20171231.xsd#SegmentInformationScheduleOfInformationOfReportableSegmentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/SegmentInformationTables" xlink:href="hcsg-20171231.xsd#SegmentInformationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/SelectedQuarterlyFinancialDataUnaudited" xlink:href="hcsg-20171231.xsd#SelectedQuarterlyFinancialDataUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/SelectedQuarterlyFinancialDataUnauditedDetails" xlink:href="hcsg-20171231.xsd#SelectedQuarterlyFinancialDataUnauditedDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/SelectedQuarterlyFinancialDataUnauditedTables" xlink:href="hcsg-20171231.xsd#SelectedQuarterlyFinancialDataUnauditedTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ShareBasedCompensation" xlink:href="hcsg-20171231.xsd#ShareBasedCompensation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ShareBasedCompensation2012EquityIncentivePlanDetails" xlink:href="hcsg-20171231.xsd#ShareBasedCompensation2012EquityIncentivePlanDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ShareBasedCompensationDeferredCompensationPlanDetails" xlink:href="hcsg-20171231.xsd#ShareBasedCompensationDeferredCompensationPlanDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ShareBasedCompensationEmployeeStockPurchasePlanDetails" xlink:href="hcsg-20171231.xsd#ShareBasedCompensationEmployeeStockPurchasePlanDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ShareBasedCompensationRestrictedStockSummaryOfOtherInformationDetails" xlink:href="hcsg-20171231.xsd#ShareBasedCompensationRestrictedStockSummaryOfOtherInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ShareBasedCompensationRestrictedStockUnitsDetails" xlink:href="hcsg-20171231.xsd#ShareBasedCompensationRestrictedStockUnitsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ShareBasedCompensationStockOptionsScheduleOfAssumptionsForFairValueOfOptionsGrantedDetails" xlink:href="hcsg-20171231.xsd#ShareBasedCompensationStockOptionsScheduleOfAssumptionsForFairValueOfOptionsGrantedDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ShareBasedCompensationStockOptionsSummaryOfOtherInformationDetails" xlink:href="hcsg-20171231.xsd#ShareBasedCompensationStockOptionsSummaryOfOtherInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ShareBasedCompensationSummarizedInformationOfStockOptionsOutstandingDetails" xlink:href="hcsg-20171231.xsd#ShareBasedCompensationSummarizedInformationOfStockOptionsOutstandingDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ShareBasedCompensationSummaryOfEsppAnnualOfferingsDetails" xlink:href="hcsg-20171231.xsd#ShareBasedCompensationSummaryOfEsppAnnualOfferingsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ShareBasedCompensationSummaryOfInformationOfSerpDetails" xlink:href="hcsg-20171231.xsd#ShareBasedCompensationSummaryOfInformationOfSerpDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ShareBasedCompensationSummaryOfRestrictedStockActivityDetails" xlink:href="hcsg-20171231.xsd#ShareBasedCompensationSummaryOfRestrictedStockActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ShareBasedCompensationSummaryOfStockBasedCompensationExpenseDetails" xlink:href="hcsg-20171231.xsd#ShareBasedCompensationSummaryOfStockBasedCompensationExpenseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ShareBasedCompensationSummaryOfStockOptionsActivityDetails" xlink:href="hcsg-20171231.xsd#ShareBasedCompensationSummaryOfStockOptionsActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/ShareBasedCompensationTables" xlink:href="hcsg-20171231.xsd#ShareBasedCompensationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.hcsgcorp.com/role/SubsequentEvents" xlink:href="hcsg-20171231.xsd#SubsequentEvents" 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.hcsgcorp.com/role/AccountsAndNotesReceivable" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/AccountsAndNotesReceivableDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/AccruedInsuranceClaims" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/AccruedInsuranceClaimsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/AllowanceForDoubtfulAccounts" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/AllowanceForDoubtfulAccountsBadDebtProvisionsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/AllowanceForDoubtfulAccountsImpairedNotesReceivableDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/AllowanceForDoubtfulAccountsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ChangesInAccumulatedOtherComprehensiveIncomeByComponent" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ChangesInAccumulatedOtherComprehensiveIncomeByComponentReclassificationAdjustmentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems" xlink:label="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_E521CAF085E07D086F0CBF28FFCE08F5" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_6B338BF3AA2822A3F13CBF28FFC99AFD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_E521CAF085E07D086F0CBF28FFCE08F5" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_6B338BF3AA2822A3F13CBF28FFC99AFD" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_DF7DC9087A84B3D0C22ABF28FFCA34FD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_6B338BF3AA2822A3F13CBF28FFC99AFD" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_DF7DC9087A84B3D0C22ABF28FFCA34FD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_DCCFAD7DE9B8217D3D12BF28FFCAA09C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_DF7DC9087A84B3D0C22ABF28FFCA34FD" xlink:to="loc_us-gaap_EquityComponentDomain_DCCFAD7DE9B8217D3D12BF28FFCAA09C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_DCCFAD7DE9B8217D3D12BF28FFCAA09C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_DF7DC9087A84B3D0C22ABF28FFCA34FD" xlink:to="loc_us-gaap_EquityComponentDomain_DCCFAD7DE9B8217D3D12BF28FFCAA09C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_C0D9E91A0180E5BD661ABF28FFCBB0E7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_DCCFAD7DE9B8217D3D12BF28FFCAA09C" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_C0D9E91A0180E5BD661ABF28FFCBB0E7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_662C2E2277844FB63E70BF28FFCB629F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_6B338BF3AA2822A3F13CBF28FFC99AFD" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_662C2E2277844FB63E70BF28FFCB629F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_F7234D3FB7887485D8E3BF28FFCC26E1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_662C2E2277844FB63E70BF28FFCB629F" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_F7234D3FB7887485D8E3BF28FFCC26E1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_F7234D3FB7887485D8E3BF28FFCC26E1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_662C2E2277844FB63E70BF28FFCB629F" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_F7234D3FB7887485D8E3BF28FFCC26E1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_045EC0577ED928BC41BEBF28FFCDB1F7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_F7234D3FB7887485D8E3BF28FFCC26E1" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_045EC0577ED928BC41BEBF28FFCDB1F7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments" xlink:label="loc_us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments_839E81D88EAD6896AE41BF28FFCE60D3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_E521CAF085E07D086F0CBF28FFCE08F5" xlink:to="loc_us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments_839E81D88EAD6896AE41BF28FFCE60D3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_C19AAEB7F115A1EF91EEBF28FFCFD0CC" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_E521CAF085E07D086F0CBF28FFCE08F5" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_C19AAEB7F115A1EF91EEBF28FFCFD0CC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_51DE4B8A2B230351D243BF28FFCF0AA1" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_E521CAF085E07D086F0CBF28FFCE08F5" xlink:to="loc_us-gaap_NetIncomeLoss_51DE4B8A2B230351D243BF28FFCF0AA1" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ChangesInAccumulatedOtherComprehensiveIncomeByComponentSummaryOfChangesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_BCE928C37E7CFDACF8CBBF8F53E93A94" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_1D7D3E780EAF7D0D7C10BF8F53E87C6E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_BCE928C37E7CFDACF8CBBF8F53E93A94" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_1D7D3E780EAF7D0D7C10BF8F53E87C6E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_CD7D150DB6758F106F91BF8F53E8A255" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_1D7D3E780EAF7D0D7C10BF8F53E87C6E" xlink:to="loc_us-gaap_RangeAxis_CD7D150DB6758F106F91BF8F53E8A255" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_4E48F3EEAF195DA7D11EBF8F53E92138_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_CD7D150DB6758F106F91BF8F53E8A255" xlink:to="loc_us-gaap_RangeMember_4E48F3EEAF195DA7D11EBF8F53E92138_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_4E48F3EEAF195DA7D11EBF8F53E92138" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_CD7D150DB6758F106F91BF8F53E8A255" xlink:to="loc_us-gaap_RangeMember_4E48F3EEAF195DA7D11EBF8F53E92138" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_09B83826C807DD233B36BF8F53E98375" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_4E48F3EEAF195DA7D11EBF8F53E92138" xlink:to="loc_us-gaap_MaximumMember_09B83826C807DD233B36BF8F53E98375" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_F9CA83868A7067797E39BF8F53E9018A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_1D7D3E780EAF7D0D7C10BF8F53E87C6E" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_F9CA83868A7067797E39BF8F53E9018A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_0B23B00B27AA88CF0C12BF8F53E9E266_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_F9CA83868A7067797E39BF8F53E9018A" xlink:to="loc_us-gaap_EquityComponentDomain_0B23B00B27AA88CF0C12BF8F53E9E266_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_0B23B00B27AA88CF0C12BF8F53E9E266" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_F9CA83868A7067797E39BF8F53E9018A" xlink:to="loc_us-gaap_EquityComponentDomain_0B23B00B27AA88CF0C12BF8F53E9E266" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_77410D7722510F47DC79BF8F53E98766" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_0B23B00B27AA88CF0C12BF8F53E9E266" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_77410D7722510F47DC79BF8F53E98766" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_4295D9B2B649BA8B16CFBF8F53E939DF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_BCE928C37E7CFDACF8CBBF8F53E93A94" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_4295D9B2B649BA8B16CFBF8F53E939DF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_1B384AABD85B449FC563BF8F53E9CC61" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_4295D9B2B649BA8B16CFBF8F53E939DF" xlink:to="loc_us-gaap_StockholdersEquity_1B384AABD85B449FC563BF8F53E9CC61" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent" xlink:label="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_A96858DD7BDA7F52902BBF8F53E992B5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_4295D9B2B649BA8B16CFBF8F53E939DF" xlink:to="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_A96858DD7BDA7F52902BBF8F53E992B5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_F92216D92E29DFFFBF19BF8F53E903BE" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_4295D9B2B649BA8B16CFBF8F53E939DF" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_F92216D92E29DFFFBF19BF8F53E903BE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_06DE4280DEE7FBCB9A30BF8F53E97DCF" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_4295D9B2B649BA8B16CFBF8F53E939DF" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_06DE4280DEE7FBCB9A30BF8F53E97DCF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet_FE0CE5B9B68AD1A01F27BF8F53E9514C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_BCE928C37E7CFDACF8CBBF8F53E93A94" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet_FE0CE5B9B68AD1A01F27BF8F53E9514C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_E015C91F5061F692AA57BF8F53E95508" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_BCE928C37E7CFDACF8CBBF8F53E93A94" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_E015C91F5061F692AA57BF8F53E95508" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ChangesInAccumulatedOtherComprehensiveIncomeByComponentTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ConsolidatedBalanceSheets" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ConsolidatedBalanceSheetsParenthetical" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ConsolidatedStatementsOfCashFlows" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ConsolidatedStatementsOfComprehensiveIncome" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ConsolidatedStatementsOfStockholdersEquity" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_2E66D75250C026EA96D99AEAAACCD83C" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_E140D589F4E33CA9AE299AEAAACBA680" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_2E66D75250C026EA96D99AEAAACCD83C" xlink:to="loc_us-gaap_StatementTable_E140D589F4E33CA9AE299AEAAACBA680" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_3D17FCDA7D523CFC8C8B9AEAAACC322A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_E140D589F4E33CA9AE299AEAAACBA680" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_3D17FCDA7D523CFC8C8B9AEAAACC322A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_54A1053B79C14981A8E09AEAAACC56BF_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_3D17FCDA7D523CFC8C8B9AEAAACC322A" xlink:to="loc_us-gaap_EquityComponentDomain_54A1053B79C14981A8E09AEAAACC56BF_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_54A1053B79C14981A8E09AEAAACC56BF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_3D17FCDA7D523CFC8C8B9AEAAACC322A" xlink:to="loc_us-gaap_EquityComponentDomain_54A1053B79C14981A8E09AEAAACC56BF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_47AA9446CC636F17DB2E9AEAAACC5720" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_54A1053B79C14981A8E09AEAAACC56BF" xlink:to="loc_us-gaap_CommonStockMember_47AA9446CC636F17DB2E9AEAAACC5720" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_5A72C0D618EC63727F049AEAAACCAF5C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_54A1053B79C14981A8E09AEAAACC56BF" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_5A72C0D618EC63727F049AEAAACCAF5C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_374F7D4C67BE3C1A215B9AEAAACC14AA" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_54A1053B79C14981A8E09AEAAACC56BF" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_374F7D4C67BE3C1A215B9AEAAACC14AA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_836D7CDB45CDC16601709AEAAACC8504" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_54A1053B79C14981A8E09AEAAACC56BF" xlink:to="loc_us-gaap_RetainedEarningsMember_836D7CDB45CDC16601709AEAAACC8504" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TreasuryStockMember" xlink:label="loc_us-gaap_TreasuryStockMember_8637D1AF346CAE5A234B9AEAAACC46EF" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_54A1053B79C14981A8E09AEAAACC56BF" xlink:to="loc_us-gaap_TreasuryStockMember_8637D1AF346CAE5A234B9AEAAACC46EF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_FD13C8E4EEBCE2B2AE039AEAAACCF1EA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2E66D75250C026EA96D99AEAAACCD83C" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_FD13C8E4EEBCE2B2AE039AEAAACCF1EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SharesIssued" xlink:label="loc_us-gaap_SharesIssued_5FCCBA7FB33B8CC535839AEAAACC8B6E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_FD13C8E4EEBCE2B2AE039AEAAACCF1EA" xlink:to="loc_us-gaap_SharesIssued_5FCCBA7FB33B8CC535839AEAAACC8B6E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_us-gaap_StockholdersEquity_C924F7A1E9F78DE0468C9AEAAACC60E5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_FD13C8E4EEBCE2B2AE039AEAAACCF1EA" xlink:to="loc_us-gaap_StockholdersEquity_C924F7A1E9F78DE0468C9AEAAACC60E5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxAbstract" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_BD32D80122057C62196E9AEAAACDAC40" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_FD13C8E4EEBCE2B2AE039AEAAACCF1EA" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_BD32D80122057C62196E9AEAAACDAC40" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_D7CDADC22AA2B7E2BAE89AEAAACD6470" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_BD32D80122057C62196E9AEAAACDAC40" xlink:to="loc_us-gaap_NetIncomeLoss_D7CDADC22AA2B7E2BAE89AEAAACD6470" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_30F085BB20B2D2AAC5F49AEAAACD6754" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_BD32D80122057C62196E9AEAAACDAC40" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_30F085BB20B2D2AAC5F49AEAAACD6754" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_946C375C0A7C144F466C9AEAAACD5389" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComprehensiveIncomeNetOfTaxAbstract_BD32D80122057C62196E9AEAAACDAC40" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_946C375C0A7C144F466C9AEAAACD5389" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_CB112E51B5DA5210BCE19AEAAACD64EB" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_FD13C8E4EEBCE2B2AE039AEAAACCF1EA" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_CB112E51B5DA5210BCE19AEAAACD64EB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_38E0B179010FAA3421589AEAAACD0E82" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_FD13C8E4EEBCE2B2AE039AEAAACCF1EA" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_38E0B179010FAA3421589AEAAACD0E82" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation_093B284AA19E44D885439AEAAACD194C" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_FD13C8E4EEBCE2B2AE039AEAAACCF1EA" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation_093B284AA19E44D885439AEAAACD194C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_818C7D91C375A325BBF49AEAAACD5442" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_FD13C8E4EEBCE2B2AE039AEAAACCF1EA" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_818C7D91C375A325BBF49AEAAACD5442" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan_A4F9B2BA66C3F9C76B989AEAAACD4BBA" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_FD13C8E4EEBCE2B2AE039AEAAACCF1EA" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeBenefitPlan_A4F9B2BA66C3F9C76B989AEAAACD4BBA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_2C98C56A30DEF049FD769AEAAACDCDCB" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_FD13C8E4EEBCE2B2AE039AEAAACCF1EA" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_2C98C56A30DEF049FD769AEAAACDCDCB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DividendsCommonStockCash" xlink:label="loc_us-gaap_DividendsCommonStockCash_C53DEB66BE8E0048ECC19AEAAACD7B29" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_FD13C8E4EEBCE2B2AE039AEAAACCF1EA" xlink:to="loc_us-gaap_DividendsCommonStockCash_C53DEB66BE8E0048ECC19AEAAACD7B29" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_4E00DFB9AAF807275BBE9AEAAACD69EF" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_FD13C8E4EEBCE2B2AE039AEAAACCF1EA" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueDividendReinvestmentPlan_4E00DFB9AAF807275BBE9AEAAACD69EF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_6015DE8698206D4240EC9AEAAACDB214" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_FD13C8E4EEBCE2B2AE039AEAAACCF1EA" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_6015DE8698206D4240EC9AEAAACDB214" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_4E5CC8B52E28A18E72179AEAAACD2503" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_FD13C8E4EEBCE2B2AE039AEAAACCF1EA" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_4E5CC8B52E28A18E72179AEAAACD2503" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_E2A3F97994159F5D9CA69AEAAACE10E6" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_FD13C8E4EEBCE2B2AE039AEAAACCF1EA" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesNewIssues_E2A3F97994159F5D9CA69AEAAACE10E6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_999A3BC39D553B6350DF9AEAAACE60DD" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_FD13C8E4EEBCE2B2AE039AEAAACCF1EA" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_999A3BC39D553B6350DF9AEAAACE60DD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockholdersEquityOtherShares" xlink:label="loc_us-gaap_StockholdersEquityOtherShares_969C4D2C81954DEB73F49AEAAACE8898" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_FD13C8E4EEBCE2B2AE039AEAAACCF1EA" xlink:to="loc_us-gaap_StockholdersEquityOtherShares_969C4D2C81954DEB73F49AEAAACE8898" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StockholdersEquityOther" xlink:label="loc_us-gaap_StockholdersEquityOther_52B3FCA43F4E79700F8A9AEAAACEBB77" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_FD13C8E4EEBCE2B2AE039AEAAACCF1EA" xlink:to="loc_us-gaap_StockholdersEquityOther_52B3FCA43F4E79700F8A9AEAAACEBB77" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ContractualObligationsAndOtherContingencies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ContractualObligationsAndOtherContingenciesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShortTermDebtLineItems" xlink:label="loc_us-gaap_ShortTermDebtLineItems_932014E8E970A34336F59BB9573608DC" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfShortTermDebtTable" xlink:label="loc_us-gaap_ScheduleOfShortTermDebtTable_EAC7DB5546F64D3FF6E49BB957368E78" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShortTermDebtLineItems_932014E8E970A34336F59BB9573608DC" xlink:to="loc_us-gaap_ScheduleOfShortTermDebtTable_EAC7DB5546F64D3FF6E49BB957368E78" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_BB69CC6B014A10F92CCA9BC11167334C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_EAC7DB5546F64D3FF6E49BB957368E78" xlink:to="loc_us-gaap_VariableRateAxis_BB69CC6B014A10F92CCA9BC11167334C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_C05CEFCD52FCA9E652549BC13F6A926E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_BB69CC6B014A10F92CCA9BC11167334C" xlink:to="loc_us-gaap_VariableRateDomain_C05CEFCD52FCA9E652549BC13F6A926E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_C05CEFCD52FCA9E652549BC13F6A926E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_BB69CC6B014A10F92CCA9BC11167334C" xlink:to="loc_us-gaap_VariableRateDomain_C05CEFCD52FCA9E652549BC13F6A926E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LondonInterbankOfferedRateLIBORMember" xlink:label="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_3AD5D884B1C6F259C63C9BC163C3DEC8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_C05CEFCD52FCA9E652549BC13F6A926E" xlink:to="loc_us-gaap_LondonInterbankOfferedRateLIBORMember_3AD5D884B1C6F259C63C9BC163C3DEC8" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_PrimeRateOrOvernightBankFundingRateMember" xlink:label="loc_hcsg_PrimeRateOrOvernightBankFundingRateMember_AFA0637F10119D5151399BC2575EA7C3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_C05CEFCD52FCA9E652549BC13F6A926E" xlink:to="loc_hcsg_PrimeRateOrOvernightBankFundingRateMember_AFA0637F10119D5151399BC2575EA7C3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShortTermDebtTypeAxis" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_D448EA0208E39A6CC2729BB957362696" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_EAC7DB5546F64D3FF6E49BB957368E78" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_D448EA0208E39A6CC2729BB957362696" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_C33091360E1D3A2A80199BB95736C61C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_D448EA0208E39A6CC2729BB957362696" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_C33091360E1D3A2A80199BB95736C61C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShortTermDebtTypeDomain" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_C33091360E1D3A2A80199BB95736C61C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_D448EA0208E39A6CC2729BB957362696" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_C33091360E1D3A2A80199BB95736C61C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LetterOfCreditMember" xlink:label="loc_us-gaap_LetterOfCreditMember_D1DFB525F6D450C2490B9BB957365346" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_C33091360E1D3A2A80199BB95736C61C" xlink:to="loc_us-gaap_LetterOfCreditMember_D1DFB525F6D450C2490B9BB957365346" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_970186E829C56EF4A9A69BB95736F8FE" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_EAC7DB5546F64D3FF6E49BB957368E78" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_970186E829C56EF4A9A69BB95736F8FE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_A16DE758CB15A12423E99BB9573685E6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_970186E829C56EF4A9A69BB95736F8FE" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_A16DE758CB15A12423E99BB9573685E6_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_A16DE758CB15A12423E99BB9573685E6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_970186E829C56EF4A9A69BB95736F8FE" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_A16DE758CB15A12423E99BB9573685E6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_5EAEC21D1D8D63A359F89BB95736F00B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_A16DE758CB15A12423E99BB9573685E6" xlink:to="loc_us-gaap_SubsequentEventMember_5EAEC21D1D8D63A359F89BB95736F00B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_7ECA44CEA8A2B397D8F59BB9573B4C61" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_932014E8E970A34336F59BB9573608DC" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_7ECA44CEA8A2B397D8F59BB9573B4C61" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_E6C4543CCFBC523DDF279BC04245FF47" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_932014E8E970A34336F59BB9573608DC" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_E6C4543CCFBC523DDF279BC04245FF47" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCredit" xlink:label="loc_us-gaap_LineOfCredit_711DAE225594A945CE299BB9573BDCC7" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_932014E8E970A34336F59BB9573608DC" xlink:to="loc_us-gaap_LineOfCredit_711DAE225594A945CE299BB9573BDCC7" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_LineOfCreditFacilityNumberOfFinancialCovenants" xlink:label="loc_hcsg_LineOfCreditFacilityNumberOfFinancialCovenants_32C96F81C2047D213B8D9BB9573BD058" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_932014E8E970A34336F59BB9573608DC" xlink:to="loc_hcsg_LineOfCreditFacilityNumberOfFinancialCovenants_32C96F81C2047D213B8D9BB9573BD058" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_B9350EA3BA35ED91FAAF9BB9573CBEC3" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_932014E8E970A34336F59BB9573608DC" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_B9350EA3BA35ED91FAAF9BB9573CBEC3" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_LineofCreditFacilityIncreaseDecreaseRemainingBorrowingCapacity" xlink:label="loc_hcsg_LineofCreditFacilityIncreaseDecreaseRemainingBorrowingCapacity_F229435B28C9DC5EAED79BB9573C1C3B" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_932014E8E970A34336F59BB9573608DC" xlink:to="loc_hcsg_LineofCreditFacilityIncreaseDecreaseRemainingBorrowingCapacity_F229435B28C9DC5EAED79BB9573C1C3B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_2B117B271DB8C2F43BF59BB9573C47A9" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_932014E8E970A34336F59BB9573608DC" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_2B117B271DB8C2F43BF59BB9573C47A9" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesAdvertisingCostsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesConcentrationsOfCreditRiskAndSignificantClientsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesFairValueOfFinancialInstrumentsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesIdentifiableIntangibleAssetsAndGoodwillDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesInvestmentsInMarketableSecuritiesAndInventoriesAndSuppliesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesNatureOfOperationsDetails" xlink:type="extended">
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_ScheduleofAccountingPoliciesLineItems" xlink:label="loc_hcsg_ScheduleofAccountingPoliciesLineItems_5E3BEA9BCB03F66D6C32EC5702F23462" xlink:type="locator" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_ScheduleofAccountingPoliciesTable" xlink:label="loc_hcsg_ScheduleofAccountingPoliciesTable_5045BBA29319ABDD030EEC5702F2CA0F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_hcsg_ScheduleofAccountingPoliciesLineItems_5E3BEA9BCB03F66D6C32EC5702F23462" xlink:to="loc_hcsg_ScheduleofAccountingPoliciesTable_5045BBA29319ABDD030EEC5702F2CA0F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_4E3DBE1592792C7D8CD9EC5702F2DE71" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hcsg_ScheduleofAccountingPoliciesTable_5045BBA29319ABDD030EEC5702F2CA0F" xlink:to="loc_us-gaap_RangeAxis_4E3DBE1592792C7D8CD9EC5702F2DE71" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_6EFF3162012DDE4D2E62EC5702F25D7C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_4E3DBE1592792C7D8CD9EC5702F2DE71" xlink:to="loc_us-gaap_RangeMember_6EFF3162012DDE4D2E62EC5702F25D7C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_6EFF3162012DDE4D2E62EC5702F25D7C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_4E3DBE1592792C7D8CD9EC5702F2DE71" xlink:to="loc_us-gaap_RangeMember_6EFF3162012DDE4D2E62EC5702F25D7C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_C2C54CF3090B99743AE6EC5702F2CDE1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_6EFF3162012DDE4D2E62EC5702F25D7C" xlink:to="loc_us-gaap_MinimumMember_C2C54CF3090B99743AE6EC5702F2CDE1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_5F7B72B59069C846AEE9EC5702F20C18" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_6EFF3162012DDE4D2E62EC5702F25D7C" xlink:to="loc_us-gaap_MaximumMember_5F7B72B59069C846AEE9EC5702F20C18" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_ServiceAgreementsDurationOfService" xlink:label="loc_hcsg_ServiceAgreementsDurationOfService_87505D232D7D01C215F2EC5702F25E3F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hcsg_ScheduleofAccountingPoliciesLineItems_5E3BEA9BCB03F66D6C32EC5702F23462" xlink:to="loc_hcsg_ServiceAgreementsDurationOfService_87505D232D7D01C215F2EC5702F25E3F" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_ServiceAgreementsDaysToCancelAgreementAfterInitialPeriod" xlink:label="loc_hcsg_ServiceAgreementsDaysToCancelAgreementAfterInitialPeriod_119C5D2EA0E09BF3D511EC5702F2EA1A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hcsg_ScheduleofAccountingPoliciesLineItems_5E3BEA9BCB03F66D6C32EC5702F23462" xlink:to="loc_hcsg_ServiceAgreementsDaysToCancelAgreementAfterInitialPeriod_119C5D2EA0E09BF3D511EC5702F2EA1A" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_ServiceAgreementsInitialPeriod" xlink:label="loc_hcsg_ServiceAgreementsInitialPeriod_5C6223ACA7FC4BA44DC6EC5702F2FD1F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hcsg_ScheduleofAccountingPoliciesLineItems_5E3BEA9BCB03F66D6C32EC5702F23462" xlink:to="loc_hcsg_ServiceAgreementsInitialPeriod_5C6223ACA7FC4BA44DC6EC5702F2FD1F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NumberOfReportableSegments" xlink:label="loc_us-gaap_NumberOfReportableSegments_4639FDA7A8D3D50677D6EC5702F25024" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hcsg_ScheduleofAccountingPoliciesLineItems_5E3BEA9BCB03F66D6C32EC5702F23462" xlink:to="loc_us-gaap_NumberOfReportableSegments_4639FDA7A8D3D50677D6EC5702F25024" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesPropertyAndEquipmentAndRevenueRecognitionDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_7C8531ADB642BE155852EC2482C08926" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_93A4A17381CD5624E574EC2482BFEB48" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_7C8531ADB642BE155852EC2482C08926" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_93A4A17381CD5624E574EC2482BFEB48" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_BE57F0F8FB2DD8A1127EEC2482BF161A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_93A4A17381CD5624E574EC2482BFEB48" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_BE57F0F8FB2DD8A1127EEC2482BF161A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_C49DFD5E70521401F5FFEC2482BFACD3_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_BE57F0F8FB2DD8A1127EEC2482BF161A" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_C49DFD5E70521401F5FFEC2482BFACD3_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_C49DFD5E70521401F5FFEC2482BFACD3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_BE57F0F8FB2DD8A1127EEC2482BF161A" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_C49DFD5E70521401F5FFEC2482BFACD3" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_HousekeepingAndDietaryEquipmentMember" xlink:label="loc_hcsg_HousekeepingAndDietaryEquipmentMember_3B4277F3F587216DDD80EC2482C086C4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_C49DFD5E70521401F5FFEC2482BFACD3" xlink:to="loc_hcsg_HousekeepingAndDietaryEquipmentMember_3B4277F3F587216DDD80EC2482C086C4" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_ComputerHardwareAndSoftwareMember" xlink:label="loc_hcsg_ComputerHardwareAndSoftwareMember_1EE6F486AA40692B4E5BEC2482C02151" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_C49DFD5E70521401F5FFEC2482BFACD3" xlink:to="loc_hcsg_ComputerHardwareAndSoftwareMember_1EE6F486AA40692B4E5BEC2482C02151" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VehiclesMember" xlink:label="loc_us-gaap_VehiclesMember_7C29318B5D23846E81BFEC2482C0CB7E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_C49DFD5E70521401F5FFEC2482BFACD3" xlink:to="loc_us-gaap_VehiclesMember_7C29318B5D23846E81BFEC2482C0CB7E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_45706945A4CC6A3821F3EC2482C0A1D5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_93A4A17381CD5624E574EC2482BFEB48" xlink:to="loc_us-gaap_RangeAxis_45706945A4CC6A3821F3EC2482C0A1D5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_D93894A6C596B05F2FACEC2482C0E0E2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_45706945A4CC6A3821F3EC2482C0A1D5" xlink:to="loc_us-gaap_RangeMember_D93894A6C596B05F2FACEC2482C0E0E2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_D93894A6C596B05F2FACEC2482C0E0E2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_45706945A4CC6A3821F3EC2482C0A1D5" xlink:to="loc_us-gaap_RangeMember_D93894A6C596B05F2FACEC2482C0E0E2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_C06C569B3EFCE5D334C7EC2482C00793" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_D93894A6C596B05F2FACEC2482C0E0E2" xlink:to="loc_us-gaap_MinimumMember_C06C569B3EFCE5D334C7EC2482C00793" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_7A9ECF236ECC7AA3C021EC2482C03A89" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_D93894A6C596B05F2FACEC2482C0E0E2" xlink:to="loc_us-gaap_MaximumMember_7A9ECF236ECC7AA3C021EC2482C03A89" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_072B8C54D39C97630157EC2482C08AFF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_7C8531ADB642BE155852EC2482C08926" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_072B8C54D39C97630157EC2482C08AFF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Depreciation" xlink:label="loc_us-gaap_Depreciation_592C1CB02574EB2EE96BEC2482C0F59F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_7C8531ADB642BE155852EC2482C08926" xlink:to="loc_us-gaap_Depreciation_592C1CB02574EB2EE96BEC2482C0F59F" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/DescriptionOfBusinessAndSignificantAccountingPoliciesRecentAccountingPronouncementsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/Dividends" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/DividendsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubsequentEventLineItems" xlink:label="loc_us-gaap_SubsequentEventLineItems_D96E38A0E4636296B7EAFCE2D5B7261F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubsequentEventTable" xlink:label="loc_us-gaap_SubsequentEventTable_D2E7C845D9EC9615DD0FFCE2D5B78A98" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SubsequentEventLineItems_D96E38A0E4636296B7EAFCE2D5B7261F" xlink:to="loc_us-gaap_SubsequentEventTable_D2E7C845D9EC9615DD0FFCE2D5B78A98" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubsequentEventTypeAxis" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_A8F9C6D665FCB7247480FCE2D5B717F6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_SubsequentEventTable_D2E7C845D9EC9615DD0FFCE2D5B78A98" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_A8F9C6D665FCB7247480FCE2D5B717F6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_280A6E95C37F4204E197FCE2D5B75052_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_A8F9C6D665FCB7247480FCE2D5B717F6" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_280A6E95C37F4204E197FCE2D5B75052_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubsequentEventTypeDomain" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_280A6E95C37F4204E197FCE2D5B75052" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_A8F9C6D665FCB7247480FCE2D5B717F6" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_280A6E95C37F4204E197FCE2D5B75052" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SubsequentEventMember" xlink:label="loc_us-gaap_SubsequentEventMember_D33327E978C9E4320D2BFCE2D5B79980" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_280A6E95C37F4204E197FCE2D5B75052" xlink:to="loc_us-gaap_SubsequentEventMember_D33327E978C9E4320D2BFCE2D5B79980" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DividendsAbstract" xlink:label="loc_us-gaap_DividendsAbstract_CA3394A1EEAD20AADE23FCE2D5B74AFD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventLineItems_D96E38A0E4636296B7EAFCE2D5B7261F" xlink:to="loc_us-gaap_DividendsAbstract_CA3394A1EEAD20AADE23FCE2D5B74AFD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_56517DAF88E47C0D6C84FCE2D5B75EBA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsAbstract_CA3394A1EEAD20AADE23FCE2D5B74AFD" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_56517DAF88E47C0D6C84FCE2D5B75EBA" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/DividendsCashDividendsPerCommonShareDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/DividendsQuarterlyDividendPaymentsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/DividendsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/EarningsPerCommonShare" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/EarningsPerCommonShareDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/EarningsPerCommonShareTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/FairValueMeasurements" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/FairValueMeasurementsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2585FDE154405CC314AFBF28FF7016AF" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_A1492A3CBF4832F5D82DBF28FF6FB4D8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2585FDE154405CC314AFBF28FF7016AF" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_A1492A3CBF4832F5D82DBF28FF6FB4D8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_6D0A6CD0D8180064E8D4BF28FF70991A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_A1492A3CBF4832F5D82DBF28FF6FB4D8" xlink:to="loc_us-gaap_RangeAxis_6D0A6CD0D8180064E8D4BF28FF70991A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_528E65365391676195DFBF28FF708DEB_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_6D0A6CD0D8180064E8D4BF28FF70991A" xlink:to="loc_us-gaap_RangeMember_528E65365391676195DFBF28FF708DEB_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_528E65365391676195DFBF28FF708DEB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_6D0A6CD0D8180064E8D4BF28FF70991A" xlink:to="loc_us-gaap_RangeMember_528E65365391676195DFBF28FF708DEB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_DD6A1E2279E9C8C0A6FEBF28FF702DCF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_528E65365391676195DFBF28FF708DEB" xlink:to="loc_us-gaap_MaximumMember_DD6A1E2279E9C8C0A6FEBF28FF702DCF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet_FBAA491576ACEC89A050BF28FF705466" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_2585FDE154405CC314AFBF28FF7016AF" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet_FBAA491576ACEC89A050BF28FF705466" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/FairValueMeasurementsContractualMaturitiesOfAvailableForSaleInvestmentsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/FairValueMeasurementsMarketableDebtSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems" xlink:label="loc_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems_C9BD555EEE45A2DB088E716051A828FA" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareTable" xlink:label="loc_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareTable_0B89A559AFC366A0547C716051A8E573" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems_C9BD555EEE45A2DB088E716051A828FA" xlink:to="loc_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareTable_0B89A559AFC366A0547C716051A8E573" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaap_InvestmentTypeAxis_8B3A4533016D97BECA4F716051A877F1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareTable_0B89A559AFC366A0547C716051A8E573" xlink:to="loc_us-gaap_InvestmentTypeAxis_8B3A4533016D97BECA4F716051A877F1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_EAF4080BC2B66AF77FCB716051A81E37_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_8B3A4533016D97BECA4F716051A877F1" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_EAF4080BC2B66AF77FCB716051A81E37_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_EAF4080BC2B66AF77FCB716051A81E37" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_8B3A4533016D97BECA4F716051A877F1" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_EAF4080BC2B66AF77FCB716051A81E37" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MunicipalBondsMember" xlink:label="loc_us-gaap_MunicipalBondsMember_9E76B99D0E517D0F4787716051A865A0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_EAF4080BC2B66AF77FCB716051A81E37" xlink:to="loc_us-gaap_MunicipalBondsMember_9E76B99D0E517D0F4787716051A865A0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_438A4246F2B12F94AAA5716051A88503" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems_C9BD555EEE45A2DB088E716051A828FA" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_438A4246F2B12F94AAA5716051A88503" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_328D464485C02175150E716051A8B4F0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems_C9BD555EEE45A2DB088E716051A828FA" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_328D464485C02175150E716051A8B4F0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_C4C452E3DF05BA122492716051A84942" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems_C9BD555EEE45A2DB088E716051A828FA" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_C4C452E3DF05BA122492716051A84942" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_E9A6BCAA9FFD3A1C754C716051A8F91C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems_C9BD555EEE45A2DB088E716051A828FA" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_E9A6BCAA9FFD3A1C754C716051A8F91C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ImpairmentOfInvestments" xlink:label="loc_us-gaap_ImpairmentOfInvestments_964070EC6297B68FD932716051A99606" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueInvestmentsEntitiesThatCalculateNetAssetValuePerShareLineItems_C9BD555EEE45A2DB088E716051A828FA" xlink:to="loc_us-gaap_ImpairmentOfInvestments_964070EC6297B68FD932716051A99606" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/FairValueMeasurementsMarketableSecuritiesAndDeferredCompensationFundInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_968ACCA1B7D3D6EDF8D5716051AEA8E7" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_416456FCBA4CC545B33A716051AD4DE3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_968ACCA1B7D3D6EDF8D5716051AEA8E7" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_416456FCBA4CC545B33A716051AD4DE3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InvestmentTypeAxis" xlink:label="loc_us-gaap_InvestmentTypeAxis_600ABF340C0AD30BA2DD716051ADD00E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_416456FCBA4CC545B33A716051AD4DE3" xlink:to="loc_us-gaap_InvestmentTypeAxis_600ABF340C0AD30BA2DD716051ADD00E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_AE8A3173EF7025B1DDFC716051AD65BE_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_600ABF340C0AD30BA2DD716051ADD00E" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_AE8A3173EF7025B1DDFC716051AD65BE_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InvestmentTypeCategorizationMember" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_AE8A3173EF7025B1DDFC716051AD65BE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_600ABF340C0AD30BA2DD716051ADD00E" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_AE8A3173EF7025B1DDFC716051AD65BE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MunicipalBondsMember" xlink:label="loc_us-gaap_MunicipalBondsMember_3EC777DF25232761DCE2716051ADC1E4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_AE8A3173EF7025B1DDFC716051AD65BE" xlink:to="loc_us-gaap_MunicipalBondsMember_3EC777DF25232761DCE2716051ADC1E4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MoneyMarketFundsMember" xlink:label="loc_us-gaap_MoneyMarketFundsMember_5EFA07E84D336CC1831D716051ADC9D2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_AE8A3173EF7025B1DDFC716051AD65BE" xlink:to="loc_us-gaap_MoneyMarketFundsMember_5EFA07E84D336CC1831D716051ADC9D2" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_BalancedAndLifestyleMember" xlink:label="loc_hcsg_BalancedAndLifestyleMember_6A167C3BE4DC7182C451716051AEF884" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_AE8A3173EF7025B1DDFC716051AD65BE" xlink:to="loc_hcsg_BalancedAndLifestyleMember_6A167C3BE4DC7182C451716051AEF884" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_LargeCapGrowthMember" xlink:label="loc_hcsg_LargeCapGrowthMember_4835544B0C25ECA1136D716051AEBC76" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_AE8A3173EF7025B1DDFC716051AD65BE" xlink:to="loc_hcsg_LargeCapGrowthMember_4835544B0C25ECA1136D716051AEBC76" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_SmallCapValueMember" xlink:label="loc_hcsg_SmallCapValueMember_BD979EF031D2137E34D9716051AE5E95" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_AE8A3173EF7025B1DDFC716051AD65BE" xlink:to="loc_hcsg_SmallCapValueMember_BD979EF031D2137E34D9716051AE5E95" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_SmallCapGrowthMember" xlink:label="loc_hcsg_SmallCapGrowthMember_0DF47E38E4A4E24E5B90716051AE52DE" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_AE8A3173EF7025B1DDFC716051AD65BE" xlink:to="loc_hcsg_SmallCapGrowthMember_0DF47E38E4A4E24E5B90716051AE52DE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FixedIncomeInvestmentsMember" xlink:label="loc_us-gaap_FixedIncomeInvestmentsMember_CCFB8D1A14B9A6518A8E716051AE2C3A" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_AE8A3173EF7025B1DDFC716051AD65BE" xlink:to="loc_us-gaap_FixedIncomeInvestmentsMember_CCFB8D1A14B9A6518A8E716051AE2C3A" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_InternationalMember" xlink:label="loc_hcsg_InternationalMember_BDEF976E26F0C1F75D96716051AEBD40" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_AE8A3173EF7025B1DDFC716051AD65BE" xlink:to="loc_hcsg_InternationalMember_BDEF976E26F0C1F75D96716051AEBD40" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_MidCapGrowthMember" xlink:label="loc_hcsg_MidCapGrowthMember_556FBA1E677015723B43716051AEF257" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_AE8A3173EF7025B1DDFC716051AD65BE" xlink:to="loc_hcsg_MidCapGrowthMember_556FBA1E677015723B43716051AEF257" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_7889EF54530497267893716051AEED2C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_416456FCBA4CC545B33A716051AD4DE3" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_7889EF54530497267893716051AEED2C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_81E98CF8CBBCC85E8449716051AE0CB2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_7889EF54530497267893716051AEED2C" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_81E98CF8CBBCC85E8449716051AE0CB2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_3BD266159F4FAC633C87716051AE9306" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_7889EF54530497267893716051AEED2C" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_3BD266159F4FAC633C87716051AE9306" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_81E98CF8CBBCC85E8449716051AE0CB2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_3BD266159F4FAC633C87716051AE9306" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_81E98CF8CBBCC85E8449716051AE0CB2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_5A38FE49056BB04B046B716051AE8622" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_81E98CF8CBBCC85E8449716051AE0CB2" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_5A38FE49056BB04B046B716051AE8622" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_799809200B3B4B8E2866716051AE2A63" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_81E98CF8CBBCC85E8449716051AE0CB2" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_799809200B3B4B8E2866716051AE2A63" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_D0AAB37F3CFD89AA0579716051AE11F9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_416456FCBA4CC545B33A716051AD4DE3" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_D0AAB37F3CFD89AA0579716051AE11F9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_CD5782B025FF95F3E537716051AE942A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_D0AAB37F3CFD89AA0579716051AE11F9" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_CD5782B025FF95F3E537716051AE942A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_CD5782B025FF95F3E537716051AE942A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_D0AAB37F3CFD89AA0579716051AE11F9" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_CD5782B025FF95F3E537716051AE942A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_DB2DAF9C805C580D7E80716051AEB152" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_CD5782B025FF95F3E537716051AE942A" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_DB2DAF9C805C580D7E80716051AEB152" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_8F8136E1719C68625F67716051AE08E0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_CD5782B025FF95F3E537716051AE942A" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_8F8136E1719C68625F67716051AE08E0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_C97C3171D89EBD0A616A716051AE4CF0" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_CD5782B025FF95F3E537716051AE942A" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_C97C3171D89EBD0A616A716051AE4CF0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AssetsFairValueDisclosureAbstract" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_D0FDC710CF323A9FB04B716051AED0DB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_968ACCA1B7D3D6EDF8D5716051AEA8E7" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_D0FDC710CF323A9FB04B716051AED0DB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MarketableSecuritiesCurrent" xlink:label="loc_us-gaap_MarketableSecuritiesCurrent_8757DD5625CEA92797C3716051AFFCFF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_D0FDC710CF323A9FB04B716051AED0DB" xlink:to="loc_us-gaap_MarketableSecuritiesCurrent_8757DD5625CEA92797C3716051AFFCFF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredCompensationPlanAssets" xlink:label="loc_us-gaap_DeferredCompensationPlanAssets_B48E822D7E818819778E716051AFCAAA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_D0FDC710CF323A9FB04B716051AED0DB" xlink:to="loc_us-gaap_DeferredCompensationPlanAssets_B48E822D7E818819778E716051AFCAAA" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/FairValueMeasurementsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/GoodwillAndOtherIntangibleAssets" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/GoodwillAndOtherIntangibleAssetsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GoodwillLineItems" xlink:label="loc_us-gaap_GoodwillLineItems_B912662F83B3D5475061EC53615347D4" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_FBA0A88DB84A4139BE51EC536150C447" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_B912662F83B3D5475061EC53615347D4" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_FBA0A88DB84A4139BE51EC536150C447" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_ED3FC68A3C4F23A9D718EC94CF4DD961" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_FBA0A88DB84A4139BE51EC536150C447" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_ED3FC68A3C4F23A9D718EC94CF4DD961" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_61B3D58A6AC0F40A10BAEC94CF5BA944_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_ED3FC68A3C4F23A9D718EC94CF4DD961" xlink:to="loc_us-gaap_SegmentDomain_61B3D58A6AC0F40A10BAEC94CF5BA944_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_61B3D58A6AC0F40A10BAEC94CF5BA944" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_ED3FC68A3C4F23A9D718EC94CF4DD961" xlink:to="loc_us-gaap_SegmentDomain_61B3D58A6AC0F40A10BAEC94CF5BA944" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_HousekeepingSegmentMember" xlink:label="loc_hcsg_HousekeepingSegmentMember_4829CBAD96527284348AEC94D062CE89" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_61B3D58A6AC0F40A10BAEC94CF5BA944" xlink:to="loc_hcsg_HousekeepingSegmentMember_4829CBAD96527284348AEC94D062CE89" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_DietarySegmentMember" xlink:label="loc_hcsg_DietarySegmentMember_359E55F4EC81994AE6F6EC94D177E54E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_61B3D58A6AC0F40A10BAEC94CF5BA944" xlink:to="loc_hcsg_DietarySegmentMember_359E55F4EC81994AE6F6EC94D177E54E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_65C14D592DC0825E0580EC5361514657" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_FBA0A88DB84A4139BE51EC536150C447" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_65C14D592DC0825E0580EC5361514657" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2013FEF276C03FB74BFFEC5361526069_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_65C14D592DC0825E0580EC5361514657" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2013FEF276C03FB74BFFEC5361526069_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2013FEF276C03FB74BFFEC5361526069" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_65C14D592DC0825E0580EC5361514657" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2013FEF276C03FB74BFFEC5361526069" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_09B44BDCF945A9CC6462EC5361538788" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2013FEF276C03FB74BFFEC5361526069" xlink:to="loc_us-gaap_CustomerRelationshipsMember_09B44BDCF945A9CC6462EC5361538788" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_C63A54E670738CA45341EC5361539499" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_B912662F83B3D5475061EC53615347D4" xlink:to="loc_us-gaap_Goodwill_C63A54E670738CA45341EC5361539499" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_6DC75DA4839B89B00469EC94CEF43EA6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_B912662F83B3D5475061EC53615347D4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_6DC75DA4839B89B00469EC94CEF43EA6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_88276CA364F36301BCFBEC5361530816" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_B912662F83B3D5475061EC53615347D4" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_88276CA364F36301BCFBEC5361530816" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/GoodwillAndOtherIntangibleAssetsEstimatedAmortizationExpenseForIntangiblesSubjectToAmortizationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_FF7FA48E37C4FDBB6F0CEC534A9C3D54" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_703FDD1BE47AD4BA3D96EC534A98A67F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_FF7FA48E37C4FDBB6F0CEC534A9C3D54" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_703FDD1BE47AD4BA3D96EC534A98A67F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_CFF7B941DCBBB99A7956EC534A98796D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_703FDD1BE47AD4BA3D96EC534A98A67F" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_CFF7B941DCBBB99A7956EC534A98796D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_771909EA331D96C149D3EC534A98FA95_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_CFF7B941DCBBB99A7956EC534A98796D" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_771909EA331D96C149D3EC534A98FA95_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_771909EA331D96C149D3EC534A98FA95" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_CFF7B941DCBBB99A7956EC534A98796D" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_771909EA331D96C149D3EC534A98FA95" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_728AF5148E847707BC15EC534A982101" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_771909EA331D96C149D3EC534A98FA95" xlink:to="loc_us-gaap_CustomerRelationshipsMember_728AF5148E847707BC15EC534A982101" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_9F839C12BCBFBD8E88E6EC534A9CDE71" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_FF7FA48E37C4FDBB6F0CEC534A9C3D54" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_9F839C12BCBFBD8E88E6EC534A9CDE71" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_FE5832D581619249BEB6EC534A9C610F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_9F839C12BCBFBD8E88E6EC534A9CDE71" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_FE5832D581619249BEB6EC534A9C610F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_B2898233F94ECC3F3440EC534A9C6AD0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_9F839C12BCBFBD8E88E6EC534A9CDE71" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_B2898233F94ECC3F3440EC534A9C6AD0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_6751B0BA320F79564BB7EC534A9C13CA" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_9F839C12BCBFBD8E88E6EC534A9CDE71" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_6751B0BA320F79564BB7EC534A9C13CA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_852CA5371602F870D5D1EC534A9D1853" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_9F839C12BCBFBD8E88E6EC534A9CDE71" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_852CA5371602F870D5D1EC534A9D1853" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_DDA7BDB0D8D3D6F365C2EC534A9DBB45" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_9F839C12BCBFBD8E88E6EC534A9CDE71" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_DDA7BDB0D8D3D6F365C2EC534A9DBB45" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_7A2D7A8A382FD316D5ECEC534A9DB6C8" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract_9F839C12BCBFBD8E88E6EC534A9CDE71" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_7A2D7A8A382FD316D5ECEC534A9DB6C8" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/GoodwillAndOtherIntangibleAssetsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/IncomeTaxes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/IncomeTaxesAdditionalInformationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/IncomeTaxesReconciliationOfProvisionForIncomeTaxesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/IncomeTaxesSignificantComponentsOfFederalAndStateDeferredTaxAssetsAndLiabilitiesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/IncomeTaxesSummaryOfProvisionForIncomeTaxesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/IncomeTaxesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/LeaseCommitments" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/LeaseCommitmentsFutureMinimumLeasePaymentsUnderOperatingLeasesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/LeaseCommitmentsOperatingLeaseExpenseDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/LeaseCommitmentsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/OtherEmployeeBenefitPlans" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/OtherEmployeeBenefitPlansDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/PropertyAndEquipment" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/PropertyAndEquipmentDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_744A9416C51FFDD4F806EC53E6E02E30" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_BFC5EE5B9FF9FC793DA8EC53E6E077ED" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_744A9416C51FFDD4F806EC53E6E02E30" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_BFC5EE5B9FF9FC793DA8EC53E6E077ED" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_EC8D8DD7AEF4D254D82FEC53E6E05D07" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_BFC5EE5B9FF9FC793DA8EC53E6E077ED" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_EC8D8DD7AEF4D254D82FEC53E6E05D07" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_72998D72899A20C4EE28EC53E6E0075F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_EC8D8DD7AEF4D254D82FEC53E6E05D07" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_72998D72899A20C4EE28EC53E6E0075F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_72998D72899A20C4EE28EC53E6E0075F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_EC8D8DD7AEF4D254D82FEC53E6E05D07" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_72998D72899A20C4EE28EC53E6E0075F" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_HousekeepingAndDietaryEquipmentMember" xlink:label="loc_hcsg_HousekeepingAndDietaryEquipmentMember_76AA7C3AEE9FBA27546DEC53E6E018B0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_72998D72899A20C4EE28EC53E6E0075F" xlink:to="loc_hcsg_HousekeepingAndDietaryEquipmentMember_76AA7C3AEE9FBA27546DEC53E6E018B0" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_ComputerHardwareAndSoftwareMember" xlink:label="loc_hcsg_ComputerHardwareAndSoftwareMember_F2E78E0C2EF0B719A742EC53E6E0A1B5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_72998D72899A20C4EE28EC53E6E0075F" xlink:to="loc_hcsg_ComputerHardwareAndSoftwareMember_F2E78E0C2EF0B719A742EC53E6E0A1B5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember" xlink:label="loc_us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember_04BC2040F489A87B6596EC53E6E05088" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_72998D72899A20C4EE28EC53E6E0075F" xlink:to="loc_us-gaap_OtherCapitalizedPropertyPlantAndEquipmentMember_04BC2040F489A87B6596EC53E6E05088" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_7B87511D160A2CCE9BB0EC53E6E00718" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_744A9416C51FFDD4F806EC53E6E02E30" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_7B87511D160A2CCE9BB0EC53E6E00718" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_0BD59ED5F71A8B42CF28EC53E6E0F644" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_744A9416C51FFDD4F806EC53E6E02E30" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_0BD59ED5F71A8B42CF28EC53E6E0F644" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_4874AC262C8A7B4EA11FEC53E6E07B33" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_744A9416C51FFDD4F806EC53E6E02E30" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_4874AC262C8A7B4EA11FEC53E6E07B33" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/PropertyAndEquipmentTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/RelatedPartyTransactions" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/RelatedPartyTransactionsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ScheduleIiValuationAndQualifyingAccountsAndReserves" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ScheduleIiValuationAndQualifyingAccountsAndReservesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems" xlink:label="loc_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_6C613E184D8A6744D644FCDF9988508C" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ValuationAndQualifyingAccountsDisclosureTable" xlink:label="loc_us-gaap_ValuationAndQualifyingAccountsDisclosureTable_A2029C68B653EAAF23F9FCDF998193CC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_6C613E184D8A6744D644FCDF9988508C" xlink:to="loc_us-gaap_ValuationAndQualifyingAccountsDisclosureTable_A2029C68B653EAAF23F9FCDF998193CC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ValuationAllowancesAndReservesTypeAxis" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_AFF1DB2AA90D2B7E5649FCDF9986A626" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ValuationAndQualifyingAccountsDisclosureTable_A2029C68B653EAAF23F9FCDF998193CC" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_AFF1DB2AA90D2B7E5649FCDF9986A626" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_67699FD6D3E26F279540FCDF99861E84_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_AFF1DB2AA90D2B7E5649FCDF9986A626" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_67699FD6D3E26F279540FCDF99861E84_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDomain" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDomain_67699FD6D3E26F279540FCDF99861E84" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesTypeAxis_AFF1DB2AA90D2B7E5649FCDF9986A626" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDomain_67699FD6D3E26F279540FCDF99861E84" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsMember" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsMember_FB187E2833D60AA41793FCDF99861160" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAllowancesAndReservesDomain_67699FD6D3E26F279540FCDF99861E84" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsMember_FB187E2833D60AA41793FCDF99861160" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_488E49559CC860BDC963FCDF99887681" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationAndQualifyingAccountsDisclosureLineItems_6C613E184D8A6744D644FCDF9988508C" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_488E49559CC860BDC963FCDF99887681" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ValuationAllowancesAndReservesBalance" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesBalance_F198CEE0F033463A6BB3FCDF998A756C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_488E49559CC860BDC963FCDF99887681" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesBalance_F198CEE0F033463A6BB3FCDF998A756C" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_ValuationAllowancesandReservesAdditionsAbstract" xlink:label="loc_hcsg_ValuationAllowancesandReservesAdditionsAbstract_73C0DA3C881E18381131FCE2AB1E26EA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_488E49559CC860BDC963FCDF99887681" xlink:to="loc_hcsg_ValuationAllowancesandReservesAdditionsAbstract_73C0DA3C881E18381131FCE2AB1E26EA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_C2AF8D1B1F33E2004E79FCDF998DEAF7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hcsg_ValuationAllowancesandReservesAdditionsAbstract_73C0DA3C881E18381131FCE2AB1E26EA" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense_C2AF8D1B1F33E2004E79FCDF998DEAF7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts_DED8A9F54A4A01F48FDDFCDF998D9E7B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hcsg_ValuationAllowancesandReservesAdditionsAbstract_73C0DA3C881E18381131FCE2AB1E26EA" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesChargedToOtherAccounts_DED8A9F54A4A01F48FDDFCDF998D9E7B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ValuationAllowancesAndReservesDeductions" xlink:label="loc_us-gaap_ValuationAllowancesAndReservesDeductions_C9A57230B73ADCF96AC6FCDF998D24E2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_488E49559CC860BDC963FCDF99887681" xlink:to="loc_us-gaap_ValuationAllowancesAndReservesDeductions_C9A57230B73ADCF96AC6FCDF998D24E2" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/SegmentInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/SegmentInformationAdditionalInformationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/SegmentInformationScheduleOfInformationOfReportableSegmentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_A0D80A656989756F9DE59BB9576E4E9A" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_B35B38C723674EF34DDF9BB9576D90F4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_A0D80A656989756F9DE59BB9576E4E9A" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_B35B38C723674EF34DDF9BB9576D90F4" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="loc_us-gaap_ConsolidationItemsAxis_E44A8414DF1655E11A819BB9576DEB7A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_B35B38C723674EF34DDF9BB9576D90F4" xlink:to="loc_us-gaap_ConsolidationItemsAxis_E44A8414DF1655E11A819BB9576DEB7A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="loc_us-gaap_ConsolidationItemsDomain_9A90908C039576313CB89BB9576DD4B2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConsolidationItemsAxis_E44A8414DF1655E11A819BB9576DEB7A" xlink:to="loc_us-gaap_ConsolidationItemsDomain_9A90908C039576313CB89BB9576DD4B2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="loc_us-gaap_ConsolidationItemsDomain_9A90908C039576313CB89BB9576DD4B2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConsolidationItemsAxis_E44A8414DF1655E11A819BB9576DEB7A" xlink:to="loc_us-gaap_ConsolidationItemsDomain_9A90908C039576313CB89BB9576DD4B2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingSegmentsMember" xlink:label="loc_us-gaap_OperatingSegmentsMember_DE8C2A6C382F85B143859BB9576D24F6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConsolidationItemsDomain_9A90908C039576313CB89BB9576DD4B2" xlink:to="loc_us-gaap_OperatingSegmentsMember_DE8C2A6C382F85B143859BB9576D24F6" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_CorporateAndEliminationsMember" xlink:label="loc_hcsg_CorporateAndEliminationsMember_4F2DC15D61C558729CE89BB9576D90D7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConsolidationItemsDomain_9A90908C039576313CB89BB9576DD4B2" xlink:to="loc_hcsg_CorporateAndEliminationsMember_4F2DC15D61C558729CE89BB9576D90D7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_0AF1DBE1B1949FD472E89BB9576DC3C7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_B35B38C723674EF34DDF9BB9576D90F4" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_0AF1DBE1B1949FD472E89BB9576DC3C7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_1780E39159802C2A3D769BB9576D2869_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_0AF1DBE1B1949FD472E89BB9576DC3C7" xlink:to="loc_us-gaap_SegmentDomain_1780E39159802C2A3D769BB9576D2869_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_1780E39159802C2A3D769BB9576D2869" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_0AF1DBE1B1949FD472E89BB9576DC3C7" xlink:to="loc_us-gaap_SegmentDomain_1780E39159802C2A3D769BB9576D2869" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_HousekeepingServicesMember" xlink:label="loc_hcsg_HousekeepingServicesMember_48239140D768E081EBDE9BB9576DEF8E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_1780E39159802C2A3D769BB9576D2869" xlink:to="loc_hcsg_HousekeepingServicesMember_48239140D768E081EBDE9BB9576DEF8E" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_DietaryServicesMember" xlink:label="loc_hcsg_DietaryServicesMember_EE78FCA322F6402ED0199BB9576D654D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_1780E39159802C2A3D769BB9576D2869" xlink:to="loc_hcsg_DietaryServicesMember_EE78FCA322F6402ED0199BB9576D654D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConcentrationRiskByTypeAxis" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_F7924727AE1047CF08C69BB9576D4AD2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_B35B38C723674EF34DDF9BB9576D90F4" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_F7924727AE1047CF08C69BB9576D4AD2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_6CF1377AA7C049951BED9BB9576D39DC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_F7924727AE1047CF08C69BB9576D4AD2" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_6CF1377AA7C049951BED9BB9576D39DC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConcentrationRiskTypeDomain" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_6CF1377AA7C049951BED9BB9576D39DC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_F7924727AE1047CF08C69BB9576D4AD2" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_6CF1377AA7C049951BED9BB9576D39DC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CustomerConcentrationRiskMember" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_00FB5F1E5F622E29A5D59BB9576D6EC3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_6CF1377AA7C049951BED9BB9576D39DC" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_00FB5F1E5F622E29A5D59BB9576D6EC3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_DE3C301ACE682DD69A569BB9576D4D34" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_B35B38C723674EF34DDF9BB9576D90F4" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_DE3C301ACE682DD69A569BB9576D4D34" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_F7D7F840E5BCDF33BAA89BB9576D5BD1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_DE3C301ACE682DD69A569BB9576D4D34" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_F7D7F840E5BCDF33BAA89BB9576D5BD1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConcentrationRiskBenchmarkDomain" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_F7D7F840E5BCDF33BAA89BB9576D5BD1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_DE3C301ACE682DD69A569BB9576D4D34" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_F7D7F840E5BCDF33BAA89BB9576D5BD1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesRevenueServicesNetMember" xlink:label="loc_us-gaap_SalesRevenueServicesNetMember_CCC63931EC4CFBBFF3999BB9576EDE9A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_F7D7F840E5BCDF33BAA89BB9576D5BD1" xlink:to="loc_us-gaap_SalesRevenueServicesNetMember_CCC63931EC4CFBBFF3999BB9576EDE9A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesRevenueServicesNet" xlink:label="loc_us-gaap_SalesRevenueServicesNet_C254008D0B39102100049BB9576E6C16" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_A0D80A656989756F9DE59BB9576E4E9A" xlink:to="loc_us-gaap_SalesRevenueServicesNet_C254008D0B39102100049BB9576E6C16" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_D6FD2CA610D421A3395C9BB9576E432A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_A0D80A656989756F9DE59BB9576E4E9A" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_D6FD2CA610D421A3395C9BB9576E432A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DepreciationDepletionAndAmortization" xlink:label="loc_us-gaap_DepreciationDepletionAndAmortization_588EB8062CF1D5C702689BB9576E76DB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_A0D80A656989756F9DE59BB9576E4E9A" xlink:to="loc_us-gaap_DepreciationDepletionAndAmortization_588EB8062CF1D5C702689BB9576E76DB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Assets" xlink:label="loc_us-gaap_Assets_5A9281AD83CAC3E6C8059BB9576EE69B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_A0D80A656989756F9DE59BB9576E4E9A" xlink:to="loc_us-gaap_Assets_5A9281AD83CAC3E6C8059BB9576EE69B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_34F8ADB9BA122D2A15EF9BB9576E52C6" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_A0D80A656989756F9DE59BB9576E4E9A" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_34F8ADB9BA122D2A15EF9BB9576E52C6" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/SegmentInformationTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/SelectedQuarterlyFinancialDataUnaudited" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/SelectedQuarterlyFinancialDataUnauditedDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/SelectedQuarterlyFinancialDataUnauditedTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ShareBasedCompensation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ShareBasedCompensation2012EquityIncentivePlanDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ShareBasedCompensationDeferredCompensationPlanDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A1A2859E290AC90FA190EC538BCBAD65" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_883640C1B09E845B25C4EC538BCA3FBD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A1A2859E290AC90FA190EC538BCBAD65" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_883640C1B09E845B25C4EC538BCA3FBD" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_71E617F8666678D0AA66EC538BCBC3A1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_883640C1B09E845B25C4EC538BCA3FBD" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_71E617F8666678D0AA66EC538BCBC3A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_8BAF7E9EB935785E921CEC538BCB55CF_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_71E617F8666678D0AA66EC538BCBC3A1" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_8BAF7E9EB935785E921CEC538BCB55CF_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_8BAF7E9EB935785E921CEC538BCB55CF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_71E617F8666678D0AA66EC538BCBC3A1" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_8BAF7E9EB935785E921CEC538BCB55CF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember" xlink:label="loc_us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember_75C0FFE62E60CB75309BEC538BCBA3AD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_8BAF7E9EB935785E921CEC538BCB55CF" xlink:to="loc_us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember_75C0FFE62E60CB75309BEC538BCBA3AD" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_DeferredCompensationPlanPercentageOfPreTaxIncomeAllowParticipantsToDefer" xlink:label="loc_hcsg_DeferredCompensationPlanPercentageOfPreTaxIncomeAllowParticipantsToDefer_023BBC46A443AE258872EC538BCB5FFC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A1A2859E290AC90FA190EC538BCBAD65" xlink:to="loc_hcsg_DeferredCompensationPlanPercentageOfPreTaxIncomeAllowParticipantsToDefer_023BBC46A443AE258872EC538BCB5FFC" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_DeferredCompensationArrangementEmployerContributionPercentageOfParticipantDeferral" xlink:label="loc_hcsg_DeferredCompensationArrangementEmployerContributionPercentageOfParticipantDeferral_6B9702C10713143DDB8CEC538BCB815E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A1A2859E290AC90FA190EC538BCBAD65" xlink:to="loc_hcsg_DeferredCompensationArrangementEmployerContributionPercentageOfParticipantDeferral_6B9702C10713143DDB8CEC538BCB815E" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_DeferredCompensationPlanPercentageDeferralInCommonStock" xlink:label="loc_hcsg_DeferredCompensationPlanPercentageDeferralInCommonStock_2F66B97F3C241DE084D0EC538BCBCA58" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A1A2859E290AC90FA190EC538BCBAD65" xlink:to="loc_hcsg_DeferredCompensationPlanPercentageDeferralInCommonStock_2F66B97F3C241DE084D0EC538BCBCA58" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_ShardbasedCompensationArrangementbySharebasedPaymentAwardFullVestinMatchingContribution" xlink:label="loc_hcsg_ShardbasedCompensationArrangementbySharebasedPaymentAwardFullVestinMatchingContribution_BC935B4B65A7FA98B5F3EC538BCBDC57" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A1A2859E290AC90FA190EC538BCBAD65" xlink:to="loc_hcsg_ShardbasedCompensationArrangementbySharebasedPaymentAwardFullVestinMatchingContribution_BC935B4B65A7FA98B5F3EC538BCBDC57" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance_6DC54FBE57CECA2FAFABEC538BCBCBF8" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A1A2859E290AC90FA190EC538BCBAD65" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualSharesAuthorizedForIssuance_6DC54FBE57CECA2FAFABEC538BCBCBF8" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_DeferredCompensationArrangementWithIndividualRemainingSharesAuthorizedForIssuance" xlink:label="loc_hcsg_DeferredCompensationArrangementWithIndividualRemainingSharesAuthorizedForIssuance_6EACCAC51A1CFA7CFA73EC538BCB67D1" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A1A2859E290AC90FA190EC538BCBAD65" xlink:to="loc_hcsg_DeferredCompensationArrangementWithIndividualRemainingSharesAuthorizedForIssuance_6EACCAC51A1CFA7CFA73EC538BCB67D1" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_DeferredCompensationArrangementWithIndividualSharesIssuedForCurrentYearFunding" xlink:label="loc_hcsg_DeferredCompensationArrangementWithIndividualSharesIssuedForCurrentYearFunding_68E6145BE69CE7622FA2EC538BCB6A40" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A1A2859E290AC90FA190EC538BCBAD65" xlink:to="loc_hcsg_DeferredCompensationArrangementWithIndividualSharesIssuedForCurrentYearFunding_68E6145BE69CE7622FA2EC538BCB6A40" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_DeferredCompensationArrangementWithIndividualSharesVestedAndOutstanding" xlink:label="loc_hcsg_DeferredCompensationArrangementWithIndividualSharesVestedAndOutstanding_3CCD3957018A27C1DB8EEC538BCB9ACF" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_A1A2859E290AC90FA190EC538BCBAD65" xlink:to="loc_hcsg_DeferredCompensationArrangementWithIndividualSharesVestedAndOutstanding_3CCD3957018A27C1DB8EEC538BCB9ACF" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ShareBasedCompensationEmployeeStockPurchasePlanDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4B253F4CEAE28DD16162EC53C696B151" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_24DB4A2C4296F70CE546EC53C6956C05" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4B253F4CEAE28DD16162EC53C696B151" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_24DB4A2C4296F70CE546EC53C6956C05" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_9ABD0D14B4AAA1A3E60EEC53C6968F65" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_24DB4A2C4296F70CE546EC53C6956C05" xlink:to="loc_us-gaap_AwardTypeAxis_9ABD0D14B4AAA1A3E60EEC53C6968F65" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C5BEB80BF640480F7B9EEC53C696B77A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_9ABD0D14B4AAA1A3E60EEC53C6968F65" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C5BEB80BF640480F7B9EEC53C696B77A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C5BEB80BF640480F7B9EEC53C696B77A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_9ABD0D14B4AAA1A3E60EEC53C6968F65" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C5BEB80BF640480F7B9EEC53C696B77A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeStockMember" xlink:label="loc_us-gaap_EmployeeStockMember_B33BB2879959565CFF37EC53C6962224" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C5BEB80BF640480F7B9EEC53C696B77A" xlink:to="loc_us-gaap_EmployeeStockMember_B33BB2879959565CFF37EC53C6962224" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardRequisiteAverageWeeklyHoursofWork" xlink:label="loc_hcsg_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardRequisiteAverageWeeklyHoursofWork_EE1F208BA2B10B58A1C3ED068945FC21" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4B253F4CEAE28DD16162EC53C696B151" xlink:to="loc_hcsg_SharebasedCompensationArrangementbySharebasedPaymentAwardAwardRequisiteAverageWeeklyHoursofWork_EE1F208BA2B10B58A1C3ED068945FC21" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_5C5C3AA8A14893EE8773ED068A6E5AE1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4B253F4CEAE28DD16162EC53C696B151" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod1_5C5C3AA8A14893EE8773ED068A6E5AE1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_64EA77CE36C817E51746EC53C696B5D4" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4B253F4CEAE28DD16162EC53C696B151" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_64EA77CE36C817E51746EC53C696B5D4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_84F5ECE5B1A49ED3EEA8EC53C696279C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4B253F4CEAE28DD16162EC53C696B151" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_84F5ECE5B1A49ED3EEA8EC53C696279C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward_DAD2CDED693F28CD9C18EC53C69661FC" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4B253F4CEAE28DD16162EC53C696B151" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward_DAD2CDED693F28CD9C18EC53C69661FC" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualEarnings" xlink:label="loc_hcsg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualEarnings_DBE2032FE48A2C971C13EC53C696DD1A" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4B253F4CEAE28DD16162EC53C696B151" xlink:to="loc_hcsg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualEarnings_DBE2032FE48A2C971C13EC53C696DD1A" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualEarningPercentOfTaxLimitation" xlink:label="loc_hcsg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualEarningPercentOfTaxLimitation_1C4878413D602B889048EC53C697341F" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4B253F4CEAE28DD16162EC53C696B151" xlink:to="loc_hcsg_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualEarningPercentOfTaxLimitation_1C4878413D602B889048EC53C697341F" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumValueOfSharesPerEmployeePerCalendarYear" xlink:label="loc_hcsg_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumValueOfSharesPerEmployeePerCalendarYear_30F064D5402060600039EC53C69CEE35" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4B253F4CEAE28DD16162EC53C696B151" xlink:to="loc_hcsg_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumValueOfSharesPerEmployeePerCalendarYear_30F064D5402060600039EC53C69CEE35" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ShareBasedCompensationRestrictedStockSummaryOfOtherInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_07CEF1DF4AD831F088FA9B5E9BBD521F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AD938D8A2D4DA9C1FA4A9B5E9BBCCE22" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_07CEF1DF4AD831F088FA9B5E9BBD521F" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AD938D8A2D4DA9C1FA4A9B5E9BBCCE22" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_9D009567B0653FFBA3E19B5E9BBDD220" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_AD938D8A2D4DA9C1FA4A9B5E9BBCCE22" xlink:to="loc_us-gaap_AwardTypeAxis_9D009567B0653FFBA3E19B5E9BBDD220" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_15CE47249FF89F6BE0FC9B5E9BBD4587_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_9D009567B0653FFBA3E19B5E9BBDD220" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_15CE47249FF89F6BE0FC9B5E9BBD4587_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_15CE47249FF89F6BE0FC9B5E9BBD4587" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_9D009567B0653FFBA3E19B5E9BBDD220" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_15CE47249FF89F6BE0FC9B5E9BBD4587" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_A190C8D72D925A40C5089B5E9BBDBD60" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_15CE47249FF89F6BE0FC9B5E9BBD4587" xlink:to="loc_us-gaap_RestrictedStockMember_A190C8D72D925A40C5089B5E9BBDBD60" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_017DB85462C719BB7D1C9B5E9BBDCE56" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_07CEF1DF4AD831F088FA9B5E9BBD521F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_017DB85462C719BB7D1C9B5E9BBDCE56" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_E6361D9338C72A8AB7479B5E9BBD819D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_07CEF1DF4AD831F088FA9B5E9BBD521F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_E6361D9338C72A8AB7479B5E9BBD819D" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedInPeriodTotalFairValue" xlink:label="loc_hcsg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedInPeriodTotalFairValue_8E5A0F5EA3320386ED989B5E9BBD1C17" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_07CEF1DF4AD831F088FA9B5E9BBD521F" xlink:to="loc_hcsg_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedInPeriodTotalFairValue_8E5A0F5EA3320386ED989B5E9BBD1C17" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_086F600D42D4FCD373F29B5E9BBFE220" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_07CEF1DF4AD831F088FA9B5E9BBD521F" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_086F600D42D4FCD373F29B5E9BBFE220" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ShareBasedCompensationRestrictedStockUnitsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C019245CE71085A8D9139B6BCB4ACBFE" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1848397929ECB547B7CA9B6BCB49FEE3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C019245CE71085A8D9139B6BCB4ACBFE" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1848397929ECB547B7CA9B6BCB49FEE3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_2EFFD3765E269D84FE389B6BCB4A32A6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1848397929ECB547B7CA9B6BCB49FEE3" xlink:to="loc_us-gaap_AwardTypeAxis_2EFFD3765E269D84FE389B6BCB4A32A6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7255A54866B0205DB70D9B6BCB4A8718_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_2EFFD3765E269D84FE389B6BCB4A32A6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7255A54866B0205DB70D9B6BCB4A8718_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7255A54866B0205DB70D9B6BCB4A8718" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_2EFFD3765E269D84FE389B6BCB4A32A6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7255A54866B0205DB70D9B6BCB4A8718" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_5EB9ED4A514C9875B0019B6BCB4AD5D9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7255A54866B0205DB70D9B6BCB4A8718" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_5EB9ED4A514C9875B0019B6BCB4AD5D9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_44BF9BA1FD2A74898BB29B6BCB4A5856" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C019245CE71085A8D9139B6BCB4ACBFE" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_44BF9BA1FD2A74898BB29B6BCB4A5856" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_E318D3369172AD8925489B6BCB4A7F91" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_44BF9BA1FD2A74898BB29B6BCB4A5856" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_E318D3369172AD8925489B6BCB4A7F91" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_76BDDAD60D0B8B5C1C189B6BCB4ADE1C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_44BF9BA1FD2A74898BB29B6BCB4A5856" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_76BDDAD60D0B8B5C1C189B6BCB4ADE1C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_CE2B7F3111126F005A049B6BCB4AAB27" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_44BF9BA1FD2A74898BB29B6BCB4A5856" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_CE2B7F3111126F005A049B6BCB4AAB27" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_FC2EE7C0A7F67B17CD479B6BCB4A998B" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_44BF9BA1FD2A74898BB29B6BCB4A5856" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_FC2EE7C0A7F67B17CD479B6BCB4A998B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_7F96F4E53389110BBC7F9B6BCB4A5667" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C019245CE71085A8D9139B6BCB4ACBFE" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_7F96F4E53389110BBC7F9B6BCB4A5667" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_9C6CF1BB695A586EFE8E9B6BCB4A4158" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_7F96F4E53389110BBC7F9B6BCB4A5667" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_9C6CF1BB695A586EFE8E9B6BCB4A4158" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_7DED6DD3EE393C18F9479B6BCB4A64E2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_7F96F4E53389110BBC7F9B6BCB4A5667" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_7DED6DD3EE393C18F9479B6BCB4A64E2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_352E9BF70A3C7FA00D6C9B6BCB4A7C9D" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_7F96F4E53389110BBC7F9B6BCB4A5667" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_352E9BF70A3C7FA00D6C9B6BCB4A7C9D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_A051FDBD4E7E4B1F20D89B6BCB4A4193" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_7F96F4E53389110BBC7F9B6BCB4A5667" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_A051FDBD4E7E4B1F20D89B6BCB4A4193" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_F979E77DB9FDA14FBE319BB93AD6DA34" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C019245CE71085A8D9139B6BCB4ACBFE" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_F979E77DB9FDA14FBE319BB93AD6DA34" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ShareBasedCompensationStockOptionsScheduleOfAssumptionsForFairValueOfOptionsGrantedDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_CD030103C22DCFD02336EC53F60F9FB1" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_BC273AF63F26F470BF65EC53F60E45DD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_CD030103C22DCFD02336EC53F60F9FB1" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_BC273AF63F26F470BF65EC53F60E45DD" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_837A77676E4EBD0E5448EC53F60E5F7C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_BC273AF63F26F470BF65EC53F60E45DD" xlink:to="loc_us-gaap_AwardTypeAxis_837A77676E4EBD0E5448EC53F60E5F7C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_139A1A8F3EA790271C02EC53F60E8189_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_837A77676E4EBD0E5448EC53F60E5F7C" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_139A1A8F3EA790271C02EC53F60E8189_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_139A1A8F3EA790271C02EC53F60E8189" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_837A77676E4EBD0E5448EC53F60E5F7C" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_139A1A8F3EA790271C02EC53F60E8189" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_681097F7C05A9014C2A2EC53F60F5564" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_139A1A8F3EA790271C02EC53F60E8189" xlink:to="loc_us-gaap_EmployeeStockOptionMember_681097F7C05A9014C2A2EC53F60F5564" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_85AFE2468FF3550733F5EC53F60FC790" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_CD030103C22DCFD02336EC53F60F9FB1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_85AFE2468FF3550733F5EC53F60FC790" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_7E64AA5BD4C05E8112AAEC53F60F32B6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_CD030103C22DCFD02336EC53F60F9FB1" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_7E64AA5BD4C05E8112AAEC53F60F32B6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_D53A22312476B4ECD266EC53F60F0F1B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_CD030103C22DCFD02336EC53F60F9FB1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_D53A22312476B4ECD266EC53F60F0F1B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_8A81FD93433752DC9EA4EC53F60F28A4" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_CD030103C22DCFD02336EC53F60F9FB1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_8A81FD93433752DC9EA4EC53F60F28A4" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ShareBasedCompensationStockOptionsSummaryOfOtherInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4175D8DF6BBFA11563651B1FC35C00A1" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_F223F19011F054573E5F1B1FC35BABB6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4175D8DF6BBFA11563651B1FC35C00A1" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_F223F19011F054573E5F1B1FC35BABB6" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_4E204976C8F52ABF70F41B1FC35B7DE5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_F223F19011F054573E5F1B1FC35BABB6" xlink:to="loc_us-gaap_AwardTypeAxis_4E204976C8F52ABF70F41B1FC35B7DE5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_16F4D986713BDE5F30DD1B1FC35B0116_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_4E204976C8F52ABF70F41B1FC35B7DE5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_16F4D986713BDE5F30DD1B1FC35B0116_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_16F4D986713BDE5F30DD1B1FC35B0116" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_4E204976C8F52ABF70F41B1FC35B7DE5" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_16F4D986713BDE5F30DD1B1FC35B0116" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_AE94916877D0AE7FAB181B1FC35BFDDD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_16F4D986713BDE5F30DD1B1FC35B0116" xlink:to="loc_us-gaap_EmployeeStockOptionMember_AE94916877D0AE7FAB181B1FC35BFDDD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_65225A9FA126403848581B1FC35C5DEB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4175D8DF6BBFA11563651B1FC35C00A1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_65225A9FA126403848581B1FC35C5DEB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_F1396F631A1CFA31C58B1B1FC35C8786" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4175D8DF6BBFA11563651B1FC35C00A1" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_F1396F631A1CFA31C58B1B1FC35C8786" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions_2BED5F82242365A7AD1E1BE6D99F6C5B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4175D8DF6BBFA11563651B1FC35C00A1" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromExerciseOfStockOptions_2BED5F82242365A7AD1E1BE6D99F6C5B" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ShareBasedCompensationSummarizedInformationOfStockOptionsOutstandingDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_97B4F1A64207DA75644E71605125340C" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_29A40D71AD22D97C2D25716051249C80" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_97B4F1A64207DA75644E71605125340C" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_29A40D71AD22D97C2D25716051249C80" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_8902976C6943EABE762F716051247D47" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable_29A40D71AD22D97C2D25716051249C80" xlink:to="loc_us-gaap_AwardTypeAxis_8902976C6943EABE762F716051247D47" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_51279A9C0190DE7F4592716051248B26_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_8902976C6943EABE762F716051247D47" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_51279A9C0190DE7F4592716051248B26_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_51279A9C0190DE7F4592716051248B26" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_8902976C6943EABE762F716051247D47" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_51279A9C0190DE7F4592716051248B26" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_43F3697252BD6309A09A716051256AF4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_51279A9C0190DE7F4592716051248B26" xlink:to="loc_us-gaap_EmployeeStockOptionMember_43F3697252BD6309A09A716051256AF4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract" xlink:label="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract_A6B0A43189B01E8D4941716051254C5F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_97B4F1A64207DA75644E71605125340C" xlink:to="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract_A6B0A43189B01E8D4941716051254C5F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_62FE44F8F3800EA2D2D071605125A953" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract_A6B0A43189B01E8D4941716051254C5F" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_62FE44F8F3800EA2D2D071605125A953" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2" xlink:label="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2_813883DAA1640C712912716051252AFE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeEndOfPeriodAbstract_A6B0A43189B01E8D4941716051254C5F" xlink:to="loc_us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2_813883DAA1640C712912716051252AFE" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeExercisableAbstractAbstract" xlink:label="loc_hcsg_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeExercisableAbstractAbstract_1DE823FF2C8F09F235CE7160512534A6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems_97B4F1A64207DA75644E71605125340C" xlink:to="loc_hcsg_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeExercisableAbstractAbstract_1DE823FF2C8F09F235CE7160512534A6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_C4434C8F67E7723EF9F271605125E4D4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hcsg_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeExercisableAbstractAbstract_1DE823FF2C8F09F235CE7160512534A6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber_C4434C8F67E7723EF9F271605125E4D4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_D870A715FAD9EEC0F7307160512528DD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hcsg_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeExercisableAbstractAbstract_1DE823FF2C8F09F235CE7160512534A6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_D870A715FAD9EEC0F7307160512528DD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_BE6F522F5744271CC47A716051253004" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hcsg_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeExercisableAbstractAbstract_1DE823FF2C8F09F235CE7160512534A6" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1_BE6F522F5744271CC47A716051253004" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_07926613F81AA514F9EB71605125E2ED" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hcsg_SharebasedCompensationSharesAuthorizedunderStockOptionPlansExercisePriceRangeExercisableAbstractAbstract_1DE823FF2C8F09F235CE7160512534A6" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1_07926613F81AA514F9EB71605125E2ED" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ShareBasedCompensationSummaryOfEsppAnnualOfferingsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C6BB72FA88B09F0D571DEC53A335C954" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_947C29E54989FD5C8F2AEC53A3348AD0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C6BB72FA88B09F0D571DEC53A335C954" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_947C29E54989FD5C8F2AEC53A3348AD0" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_09C6AD48C164DEC27C45EC53A3349665" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_947C29E54989FD5C8F2AEC53A3348AD0" xlink:to="loc_us-gaap_AwardTypeAxis_09C6AD48C164DEC27C45EC53A3349665" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3BCEA131EBC9A32B07D9EC53A334DBA6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_09C6AD48C164DEC27C45EC53A3349665" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3BCEA131EBC9A32B07D9EC53A334DBA6_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3BCEA131EBC9A32B07D9EC53A334DBA6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_09C6AD48C164DEC27C45EC53A3349665" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3BCEA131EBC9A32B07D9EC53A334DBA6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeStockMember" xlink:label="loc_us-gaap_EmployeeStockMember_E08BC66B29A9CB0E44FDEC53A3344944" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3BCEA131EBC9A32B07D9EC53A334DBA6" xlink:to="loc_us-gaap_EmployeeStockMember_E08BC66B29A9CB0E44FDEC53A3344944" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward_3BB3D050E28D68D1CE8CEC53A33565B9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C6BB72FA88B09F0D571DEC53A335C954" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward_3BB3D050E28D68D1CE8CEC53A33565B9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased_C4B9777F4AB972AD1961EC53A3358E56" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_C6BB72FA88B09F0D571DEC53A335C954" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased_C4B9777F4AB972AD1961EC53A3358E56" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ShareBasedCompensationSummaryOfInformationOfSerpDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1B24720E7473F5E9355C9BB830FE34C6" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_BBBEDAAD15E147758F819BB830FE9F46" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1B24720E7473F5E9355C9BB830FE34C6" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_BBBEDAAD15E147758F819BB830FE9F46" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RetirementPlanTypeAxis" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_BB26B22B590E4F03A5F99BB830FEFF96" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_BBBEDAAD15E147758F819BB830FE9F46" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_BB26B22B590E4F03A5F99BB830FEFF96" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_F1838100C72C1E225A269BB830FE54FC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_BB26B22B590E4F03A5F99BB830FEFF96" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_F1838100C72C1E225A269BB830FE54FC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RetirementPlanTypeDomain" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_F1838100C72C1E225A269BB830FE54FC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_BB26B22B590E4F03A5F99BB830FEFF96" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_F1838100C72C1E225A269BB830FE54FC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember" xlink:label="loc_us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember_260B21D01685ADE7DF699BB830FEB829" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_F1838100C72C1E225A269BB830FE54FC" xlink:to="loc_us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember_260B21D01685ADE7DF699BB830FEB829" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_326114EAD64AA151313B9BB830FE16EC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1B24720E7473F5E9355C9BB830FE34C6" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_326114EAD64AA151313B9BB830FE16EC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued" xlink:label="loc_us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued_3BAA2EE5333BB9A7A28F9BB830FE0F28" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1B24720E7473F5E9355C9BB830FE34C6" xlink:to="loc_us-gaap_DeferredCompensationArrangementWithIndividualSharesIssued_3BAA2EE5333BB9A7A28F9BB830FE0F28" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_DeferredCompensationTrustAccountBalance" xlink:label="loc_hcsg_DeferredCompensationTrustAccountBalance_4BC88AD10FCC0D8A944F9BB830FECDDD" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1B24720E7473F5E9355C9BB830FE34C6" xlink:to="loc_hcsg_DeferredCompensationTrustAccountBalance_4BC88AD10FCC0D8A944F9BB830FECDDD" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_DeferredCompensationUnrealizedGainLossRecordedWithinDeferredCompensationLiabilityAccount" xlink:label="loc_hcsg_DeferredCompensationUnrealizedGainLossRecordedWithinDeferredCompensationLiabilityAccount_9D3E8276CCC684E640E99BB830FE6B0E" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_1B24720E7473F5E9355C9BB830FE34C6" xlink:to="loc_hcsg_DeferredCompensationUnrealizedGainLossRecordedWithinDeferredCompensationLiabilityAccount_9D3E8276CCC684E640E99BB830FE6B0E" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ShareBasedCompensationSummaryOfRestrictedStockActivityDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B488E2A4E7A442FC44D1EC53E25FFB15" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_CEAE0B0AB4826DC550BBEC53E25E19EC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B488E2A4E7A442FC44D1EC53E25FFB15" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_CEAE0B0AB4826DC550BBEC53E25E19EC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_35A9B8CDDECAF87AEBA5EC53E25F0F3D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_CEAE0B0AB4826DC550BBEC53E25E19EC" xlink:to="loc_us-gaap_AwardTypeAxis_35A9B8CDDECAF87AEBA5EC53E25F0F3D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_474BCC0EAF1AC0691101EC53E25FAA0C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_35A9B8CDDECAF87AEBA5EC53E25F0F3D" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_474BCC0EAF1AC0691101EC53E25FAA0C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_474BCC0EAF1AC0691101EC53E25FAA0C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_35A9B8CDDECAF87AEBA5EC53E25F0F3D" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_474BCC0EAF1AC0691101EC53E25FAA0C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestrictedStockMember" xlink:label="loc_us-gaap_RestrictedStockMember_C7BC04CEAC16EBE0962CEC53E25F7966" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_474BCC0EAF1AC0691101EC53E25FAA0C" xlink:to="loc_us-gaap_RestrictedStockMember_C7BC04CEAC16EBE0962CEC53E25F7966" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_8B886949BB4F2933730AEC53E25F238E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B488E2A4E7A442FC44D1EC53E25FFB15" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_8B886949BB4F2933730AEC53E25F238E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_2AAE9587E073192D59E3EC53E25F9DC6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_8B886949BB4F2933730AEC53E25F238E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_2AAE9587E073192D59E3EC53E25F9DC6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_B31563008FBD0A01E56DEC53E25FAAF5" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_8B886949BB4F2933730AEC53E25F238E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_B31563008FBD0A01E56DEC53E25FAAF5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_96DFA8315EF0306CDF82EC53E25FEC0F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_8B886949BB4F2933730AEC53E25F238E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_96DFA8315EF0306CDF82EC53E25FEC0F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_576E9D3E0DBAD1F3CDCFEC53E25FCD93" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfSharesRollForward_8B886949BB4F2933730AEC53E25F238E" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_576E9D3E0DBAD1F3CDCFEC53E25FCD93" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_FD9180390B096793C537EC53E25FBF26" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_B488E2A4E7A442FC44D1EC53E25FFB15" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_FD9180390B096793C537EC53E25FBF26" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_05AD96C4F16C1C7A0AE3EC53E25F92C6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_FD9180390B096793C537EC53E25FBF26" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_05AD96C4F16C1C7A0AE3EC53E25F92C6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_D9183FD4FB0D1D7FDF3EEC53E25FCAF1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_FD9180390B096793C537EC53E25FBF26" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_D9183FD4FB0D1D7FDF3EEC53E25FCAF1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_70B5D8359CB407AEEFB8EC53E25F7D03" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_FD9180390B096793C537EC53E25FBF26" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_70B5D8359CB407AEEFB8EC53E25F7D03" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_4D3E598CCB764DAE9D38EC53E25F78AF" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValueAbstract_FD9180390B096793C537EC53E25FBF26" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_4D3E598CCB764DAE9D38EC53E25F78AF" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ShareBasedCompensationSummaryOfStockBasedCompensationExpenseDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2A393E2E674046E1986971605155C2CE" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_75CC9D3E3368BFD27A7271605155F3F1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2A393E2E674046E1986971605155C2CE" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_75CC9D3E3368BFD27A7271605155F3F1" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_769B7E789BA4073145F7716051550BD3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_75CC9D3E3368BFD27A7271605155F3F1" xlink:to="loc_us-gaap_AwardTypeAxis_769B7E789BA4073145F7716051550BD3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_46FE5071E14C7EDD19617160515537A2_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_769B7E789BA4073145F7716051550BD3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_46FE5071E14C7EDD19617160515537A2_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_46FE5071E14C7EDD19617160515537A2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_769B7E789BA4073145F7716051550BD3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_46FE5071E14C7EDD19617160515537A2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_39E82A564D913096593B71605155A61F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_46FE5071E14C7EDD19617160515537A2" xlink:to="loc_us-gaap_EmployeeStockOptionMember_39E82A564D913096593B71605155A61F" xlink:type="arc" />
    <link:loc xlink:href="hcsg-20171231.xsd#hcsg_RestrictedStockAndRestrictedStockUnitsRSUsMember" xlink:label="loc_hcsg_RestrictedStockAndRestrictedStockUnitsRSUsMember_F988AD94CFF7A7273889716051557ABD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_46FE5071E14C7EDD19617160515537A2" xlink:to="loc_hcsg_RestrictedStockAndRestrictedStockUnitsRSUsMember_F988AD94CFF7A7273889716051557ABD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeStockMember" xlink:label="loc_us-gaap_EmployeeStockMember_67EF7436A0BA0C96E40771605155CE27" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_46FE5071E14C7EDD19617160515537A2" xlink:to="loc_us-gaap_EmployeeStockMember_67EF7436A0BA0C96E40771605155CE27" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_CAE9DC7E6B42329CA7E971605155B5C6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2A393E2E674046E1986971605155C2CE" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_CAE9DC7E6B42329CA7E971605155B5C6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_C0E24937D5B57394115471605155E4D0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2A393E2E674046E1986971605155C2CE" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_C0E24937D5B57394115471605155E4D0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_B7F225477F394AE90D5471605155D8F9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2A393E2E674046E1986971605155C2CE" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_B7F225477F394AE90D5471605155D8F9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_AF3FF7C3E88B3B01DCBD71605155171C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_2A393E2E674046E1986971605155C2CE" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_AF3FF7C3E88B3B01DCBD71605155171C" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ShareBasedCompensationSummaryOfStockOptionsActivityDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/ShareBasedCompensationTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.hcsgcorp.com/role/SubsequentEvents" xlink:type="extended" />
</link:linkbase>
