<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019d8c5b-11f0-7999-8c7d-3775bb17c6d6,g:b45c0556-b5be-4634-8306-9cfc151e313f-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.graco.com/role/ConsolidatedStatementsofShareholdersEquityUnaudited" xlink:type="simple" xlink:href="ggg-20260327.xsd#ConsolidatedStatementsofShareholdersEquityUnaudited"/>
  <link:definitionLink xlink:role="http://www.graco.com/role/ConsolidatedStatementsofShareholdersEquityUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019d8c5b-12d0-7136-b053-1fd498cbdb35" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019d8c5b-12d0-7610-bed3-5f203efde534" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019d8c5b-12d0-7136-b053-1fd498cbdb35" xlink:to="loc_us-gaap_StatementTable_019d8c5b-12d0-7610-bed3-5f203efde534" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019d8c5b-12d0-72bf-8bb5-97238e2a49dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019d8c5b-12d0-7610-bed3-5f203efde534" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019d8c5b-12d0-72bf-8bb5-97238e2a49dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019d8c5b-12d0-72bf-8bb5-97238e2a49dc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019d8c5b-12d0-72bf-8bb5-97238e2a49dc" xlink:to="loc_us-gaap_EquityComponentDomain_019d8c5b-12d0-72bf-8bb5-97238e2a49dc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019d8c5b-12d0-76a5-bb21-d22f1294f1f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019d8c5b-12d0-72bf-8bb5-97238e2a49dc" xlink:to="loc_us-gaap_EquityComponentDomain_019d8c5b-12d0-76a5-bb21-d22f1294f1f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019d8c5b-12d0-79ae-bb88-eb3f69836e43" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019d8c5b-12d0-76a5-bb21-d22f1294f1f4" xlink:to="loc_us-gaap_CommonStockMember_019d8c5b-12d0-79ae-bb88-eb3f69836e43" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019d8c5b-12d0-7e95-a3f5-73242d71eebd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019d8c5b-12d0-76a5-bb21-d22f1294f1f4" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019d8c5b-12d0-7e95-a3f5-73242d71eebd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019d8c5b-12d0-7a4e-9582-47b673caa50a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019d8c5b-12d0-76a5-bb21-d22f1294f1f4" xlink:to="loc_us-gaap_RetainedEarningsMember_019d8c5b-12d0-7a4e-9582-47b673caa50a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019d8c5b-12d0-7d61-85c5-8bf6aa57e344" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019d8c5b-12d0-76a5-bb21-d22f1294f1f4" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019d8c5b-12d0-7d61-85c5-8bf6aa57e344" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019d8c5b-12d0-730f-85c3-2d9bca5d0b58" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019d8c5b-12d0-7136-b053-1fd498cbdb35" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019d8c5b-12d0-730f-85c3-2d9bca5d0b58" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019d8c5b-12d0-7444-b4d1-478d4b3588ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019d8c5b-12d0-730f-85c3-2d9bca5d0b58" xlink:to="loc_us-gaap_StockholdersEquity_019d8c5b-12d0-7444-b4d1-478d4b3588ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019d8c5b-12d0-7643-a41d-fabbdef569f5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019d8c5b-12d0-730f-85c3-2d9bca5d0b58" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019d8c5b-12d0-7643-a41d-fabbdef569f5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_019d8c5b-12d0-783b-948c-81da6db82819" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019d8c5b-12d0-730f-85c3-2d9bca5d0b58" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_019d8c5b-12d0-783b-948c-81da6db82819" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019d8c5b-12d0-76f4-97a5-2fa69682aa35" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019d8c5b-12d0-730f-85c3-2d9bca5d0b58" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019d8c5b-12d0-76f4-97a5-2fa69682aa35" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_019d8c5b-12d0-7977-8795-d5dbb948f15d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019d8c5b-12d0-730f-85c3-2d9bca5d0b58" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures_019d8c5b-12d0-7977-8795-d5dbb948f15d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019d8c5b-12d0-7d6f-a2ed-ceaacad16f07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019d8c5b-12d0-730f-85c3-2d9bca5d0b58" xlink:to="loc_us-gaap_NetIncomeLoss_019d8c5b-12d0-7d6f-a2ed-ceaacad16f07" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_019d8c5b-12d0-77de-9a07-c3d1d187a6dc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019d8c5b-12d0-730f-85c3-2d9bca5d0b58" xlink:to="loc_us-gaap_DividendsCommonStockCash_019d8c5b-12d0-77de-9a07-c3d1d187a6dc" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019d8c5b-12d0-74bf-a4ce-c161059100cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019d8c5b-12d0-730f-85c3-2d9bca5d0b58" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019d8c5b-12d0-74bf-a4ce-c161059100cf" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019d8c5b-12d0-795c-90aa-5d3ac12d831f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.graco.com/role/SegmentReportingInformationOperationsandAssetsDetails" xlink:type="simple" xlink:href="ggg-20260327.xsd#SegmentReportingInformationOperationsandAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.graco.com/role/SegmentReportingInformationOperationsandAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019d8c5b-12d0-7e62-b033-2123937b5b0c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019d8c5b-12d0-784c-ba2d-022b56999212" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019d8c5b-12d0-7e62-b033-2123937b5b0c" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019d8c5b-12d0-784c-ba2d-022b56999212" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019d8c5b-12d0-71a4-a9f2-82e2e2b9c568" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019d8c5b-12d0-784c-ba2d-022b56999212" xlink:to="loc_srt_ConsolidationItemsAxis_019d8c5b-12d0-71a4-a9f2-82e2e2b9c568" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019d8c5b-12d0-71a4-a9f2-82e2e2b9c568_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019d8c5b-12d0-71a4-a9f2-82e2e2b9c568" xlink:to="loc_srt_ConsolidationItemsDomain_019d8c5b-12d0-71a4-a9f2-82e2e2b9c568_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019d8c5b-12d0-79a3-ac68-c1aa53623735" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019d8c5b-12d0-71a4-a9f2-82e2e2b9c568" xlink:to="loc_srt_ConsolidationItemsDomain_019d8c5b-12d0-79a3-ac68-c1aa53623735" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019d8c5b-12d0-7e6f-b04c-4a7b01310d31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019d8c5b-12d0-79a3-ac68-c1aa53623735" xlink:to="loc_us-gaap_OperatingSegmentsMember_019d8c5b-12d0-7e6f-b04c-4a7b01310d31" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_019d8c5b-12d0-7dc1-bbbb-b73ed0f020fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019d8c5b-12d0-79a3-ac68-c1aa53623735" xlink:to="loc_us-gaap_CorporateNonSegmentMember_019d8c5b-12d0-7dc1-bbbb-b73ed0f020fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019d8c5b-12d0-7fd5-8c37-35bd55ee4e50" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019d8c5b-12d0-784c-ba2d-022b56999212" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019d8c5b-12d0-7fd5-8c37-35bd55ee4e50" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019d8c5b-12d0-7fd5-8c37-35bd55ee4e50_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019d8c5b-12d0-7fd5-8c37-35bd55ee4e50" xlink:to="loc_us-gaap_SegmentDomain_019d8c5b-12d0-7fd5-8c37-35bd55ee4e50_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019d8c5b-12d0-7704-aa57-21ad985ba790" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019d8c5b-12d0-7fd5-8c37-35bd55ee4e50" xlink:to="loc_us-gaap_SegmentDomain_019d8c5b-12d0-7704-aa57-21ad985ba790" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ggg_ContractorMember_019d8c5b-12d0-7ce7-b571-5802b1f4b8e7" xlink:href="ggg-20260327.xsd#ggg_ContractorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019d8c5b-12d0-7704-aa57-21ad985ba790" xlink:to="loc_ggg_ContractorMember_019d8c5b-12d0-7ce7-b571-5802b1f4b8e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ggg_IndustrialMember_019d8c5b-12d0-7d0b-8b62-3501d9bcf71d" xlink:href="ggg-20260327.xsd#ggg_IndustrialMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019d8c5b-12d0-7704-aa57-21ad985ba790" xlink:to="loc_ggg_IndustrialMember_019d8c5b-12d0-7d0b-8b62-3501d9bcf71d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ggg_ExpansionMarketsMember_019d8c5b-12d0-741a-9509-79c620b416ff" xlink:href="ggg-20260327.xsd#ggg_ExpansionMarketsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019d8c5b-12d0-7704-aa57-21ad985ba790" xlink:to="loc_ggg_ExpansionMarketsMember_019d8c5b-12d0-741a-9509-79c620b416ff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019d8c5b-12d0-702f-b0c6-fb45d4d550c8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019d8c5b-12d0-7e62-b033-2123937b5b0c" xlink:to="loc_us-gaap_Revenues_019d8c5b-12d0-702f-b0c6-fb45d4d550c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfGoodsAndServicesSold_019d8c5b-12d0-7f25-87ab-0e71f7b1ac71" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CostOfGoodsAndServicesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019d8c5b-12d0-7e62-b033-2123937b5b0c" xlink:to="loc_us-gaap_CostOfGoodsAndServicesSold_019d8c5b-12d0-7f25-87ab-0e71f7b1ac71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_019d8c5b-12d0-7aa3-a775-173e5eb03c3e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019d8c5b-12d0-7e62-b033-2123937b5b0c" xlink:to="loc_us-gaap_GrossProfit_019d8c5b-12d0-7aa3-a775-173e5eb03c3e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpenses_019d8c5b-12d0-7d8a-8509-eb06c90981b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019d8c5b-12d0-7e62-b033-2123937b5b0c" xlink:to="loc_us-gaap_OperatingExpenses_019d8c5b-12d0-7d8a-8509-eb06c90981b0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_019d8c5b-12d0-7046-92ac-9f22fdfd7d77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019d8c5b-12d0-7e62-b033-2123937b5b0c" xlink:to="loc_us-gaap_OperatingIncomeLoss_019d8c5b-12d0-7046-92ac-9f22fdfd7d77" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseNonoperating_019d8c5b-12d0-79d9-bf7e-4c6d23c77e78" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseNonoperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019d8c5b-12d0-7e62-b033-2123937b5b0c" xlink:to="loc_us-gaap_InterestExpenseNonoperating_019d8c5b-12d0-79d9-bf7e-4c6d23c77e78" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_019d8c5b-12d0-734a-b60d-4d99bea87c37" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019d8c5b-12d0-7e62-b033-2123937b5b0c" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_019d8c5b-12d0-734a-b60d-4d99bea87c37" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019d8c5b-12d0-792e-a8e5-64abe8efee80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019d8c5b-12d0-7e62-b033-2123937b5b0c" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019d8c5b-12d0-792e-a8e5-64abe8efee80" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.graco.com/role/SegmentReportingInformationGeographicDetails" xlink:type="simple" xlink:href="ggg-20260327.xsd#SegmentReportingInformationGeographicDetails"/>
  <link:definitionLink xlink:role="http://www.graco.com/role/SegmentReportingInformationGeographicDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_019d8c5b-12d1-72eb-9196-4a9ac78b19bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_019d8c5b-12d0-7b4c-a669-cd7ce167a159" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_019d8c5b-12d1-72eb-9196-4a9ac78b19bc" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_019d8c5b-12d0-7b4c-a669-cd7ce167a159" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019d8c5b-12d0-7c65-ae1d-9263d5ede23a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_019d8c5b-12d0-7b4c-a669-cd7ce167a159" xlink:to="loc_srt_StatementGeographicalAxis_019d8c5b-12d0-7c65-ae1d-9263d5ede23a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019d8c5b-12d0-7c65-ae1d-9263d5ede23a_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019d8c5b-12d0-7c65-ae1d-9263d5ede23a" xlink:to="loc_srt_SegmentGeographicalDomain_019d8c5b-12d0-7c65-ae1d-9263d5ede23a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019d8c5b-12d0-7435-83c8-7c68a079f834" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019d8c5b-12d0-7c65-ae1d-9263d5ede23a" xlink:to="loc_srt_SegmentGeographicalDomain_019d8c5b-12d0-7435-83c8-7c68a079f834" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019d8c5b-12d0-72bd-8278-69ba3ede6b63" xlink:href="https://xbrl.sec.gov/country/2026/country-2026.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019d8c5b-12d0-7435-83c8-7c68a079f834" xlink:to="loc_country_US_019d8c5b-12d0-72bd-8278-69ba3ede6b63" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonUsMember_019d8c5b-12d1-71d8-9db5-d6061da1e8ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NonUsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019d8c5b-12d0-7435-83c8-7c68a079f834" xlink:to="loc_us-gaap_NonUsMember_019d8c5b-12d1-71d8-9db5-d6061da1e8ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019d8c5b-12d1-7a63-8d8c-b70f5a47b460" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_019d8c5b-12d1-72eb-9196-4a9ac78b19bc" xlink:to="loc_us-gaap_Revenues_019d8c5b-12d1-7a63-8d8c-b70f5a47b460" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncurrentAssets_019d8c5b-12d1-7259-b29b-c18b9e80b734" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_019d8c5b-12d1-72eb-9196-4a9ac78b19bc" xlink:to="loc_us-gaap_NoncurrentAssets_019d8c5b-12d1-7259-b29b-c18b9e80b734" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.graco.com/role/ShareBasedAwardsNarrativeDetails" xlink:type="simple" xlink:href="ggg-20260327.xsd#ShareBasedAwardsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.graco.com/role/ShareBasedAwardsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d8c5b-12d1-70ea-9522-fa05f1d849c2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019d8c5b-12d1-70c5-a421-9ee481935d7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d8c5b-12d1-70ea-9522-fa05f1d849c2" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019d8c5b-12d1-70c5-a421-9ee481935d7f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019d8c5b-12d1-7728-88ac-6dd3120db068" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019d8c5b-12d1-70c5-a421-9ee481935d7f" xlink:to="loc_us-gaap_AwardTypeAxis_019d8c5b-12d1-7728-88ac-6dd3120db068" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d8c5b-12d1-7728-88ac-6dd3120db068_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019d8c5b-12d1-7728-88ac-6dd3120db068" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d8c5b-12d1-7728-88ac-6dd3120db068_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d8c5b-12d1-78e3-b454-069f676d106e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019d8c5b-12d1-7728-88ac-6dd3120db068" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d8c5b-12d1-78e3-b454-069f676d106e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_019d8c5b-12d1-7b21-ac32-bfa809e5d07c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d8c5b-12d1-78e3-b454-069f676d106e" xlink:to="loc_us-gaap_EmployeeStockMember_019d8c5b-12d1-7b21-ac32-bfa809e5d07c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_019d8c5b-12d1-79fb-ad52-0ce13ea7f4c8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d8c5b-12d1-70ea-9522-fa05f1d849c2" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_019d8c5b-12d1-79fb-ad52-0ce13ea7f4c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate_019d8c5b-12d1-7174-b5ab-d83dc2de3a71" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d8c5b-12d1-70ea-9522-fa05f1d849c2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDiscountFromMarketPriceOfferingDate_019d8c5b-12d1-7174-b5ab-d83dc2de3a71" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.graco.com/role/ShareBasedAwardsOptionsFairValueInputsDetails" xlink:type="simple" xlink:href="ggg-20260327.xsd#ShareBasedAwardsOptionsFairValueInputsDetails"/>
  <link:definitionLink xlink:role="http://www.graco.com/role/ShareBasedAwardsOptionsFairValueInputsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d8c5b-12d1-72e3-a876-816657d2c5cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019d8c5b-12d1-7d3d-bd65-63fd4af016a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d8c5b-12d1-72e3-a876-816657d2c5cb" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019d8c5b-12d1-7d3d-bd65-63fd4af016a6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019d8c5b-12d1-7e40-bad8-f822cbc6a0a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019d8c5b-12d1-7d3d-bd65-63fd4af016a6" xlink:to="loc_us-gaap_AwardTypeAxis_019d8c5b-12d1-7e40-bad8-f822cbc6a0a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d8c5b-12d1-7e40-bad8-f822cbc6a0a4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019d8c5b-12d1-7e40-bad8-f822cbc6a0a4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d8c5b-12d1-7e40-bad8-f822cbc6a0a4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d8c5b-12d1-7ab4-9cab-6d9df9b7bcf8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019d8c5b-12d1-7e40-bad8-f822cbc6a0a4" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d8c5b-12d1-7ab4-9cab-6d9df9b7bcf8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_019d8c5b-12d1-79f7-84a4-4febf7606ba5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d8c5b-12d1-7ab4-9cab-6d9df9b7bcf8" xlink:to="loc_us-gaap_EmployeeStockOptionMember_019d8c5b-12d1-79f7-84a4-4febf7606ba5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_019d8c5b-12d1-7427-a49a-6e50e5f4e782" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d8c5b-12d1-72e3-a876-816657d2c5cb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_019d8c5b-12d1-7427-a49a-6e50e5f4e782" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_019d8c5b-12d1-716d-ad40-8d6b861a55b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_019d8c5b-12d1-7427-a49a-6e50e5f4e782" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_019d8c5b-12d1-716d-ad40-8d6b861a55b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_019d8c5b-12d1-7658-b478-dea5a960ead3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_019d8c5b-12d1-7427-a49a-6e50e5f4e782" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_019d8c5b-12d1-7658-b478-dea5a960ead3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_019d8c5b-12d1-773e-b974-a402cb954c08" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_019d8c5b-12d1-7427-a49a-6e50e5f4e782" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_019d8c5b-12d1-773e-b974-a402cb954c08" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_019d8c5b-12d1-7708-89a8-9b961169e2c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_019d8c5b-12d1-7427-a49a-6e50e5f4e782" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_019d8c5b-12d1-7708-89a8-9b961169e2c7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019d8c5b-12d1-7750-b6a0-d922d5e0f233" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract_019d8c5b-12d1-7427-a49a-6e50e5f4e782" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019d8c5b-12d1-7750-b6a0-d922d5e0f233" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.graco.com/role/ShareBasedAwardsESPPFairValueInputsDetails" xlink:type="simple" xlink:href="ggg-20260327.xsd#ShareBasedAwardsESPPFairValueInputsDetails"/>
  <link:definitionLink xlink:role="http://www.graco.com/role/ShareBasedAwardsESPPFairValueInputsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d8c5b-12d1-7072-8bd0-958373f9bbe6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019d8c5b-12d1-7efa-80e7-800ff946a30a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d8c5b-12d1-7072-8bd0-958373f9bbe6" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019d8c5b-12d1-7efa-80e7-800ff946a30a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019d8c5b-12d1-710d-850e-30cce44e9b56" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_019d8c5b-12d1-7efa-80e7-800ff946a30a" xlink:to="loc_us-gaap_AwardTypeAxis_019d8c5b-12d1-710d-850e-30cce44e9b56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d8c5b-12d1-710d-850e-30cce44e9b56_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019d8c5b-12d1-710d-850e-30cce44e9b56" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d8c5b-12d1-710d-850e-30cce44e9b56_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d8c5b-12d1-78e1-8aaf-9cb1d51ba5db" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019d8c5b-12d1-710d-850e-30cce44e9b56" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d8c5b-12d1-78e1-8aaf-9cb1d51ba5db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_019d8c5b-12d1-7e9c-ae8b-229c94fdbef8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019d8c5b-12d1-78e1-8aaf-9cb1d51ba5db" xlink:to="loc_us-gaap_EmployeeStockMember_019d8c5b-12d1-7e9c-ae8b-229c94fdbef8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_019d8c5b-12d1-7403-9366-dce77a789fb9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d8c5b-12d1-7072-8bd0-958373f9bbe6" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_019d8c5b-12d1-7403-9366-dce77a789fb9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_019d8c5b-12d1-71e3-85cc-7c0de6b2a2ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d8c5b-12d1-7072-8bd0-958373f9bbe6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_019d8c5b-12d1-71e3-85cc-7c0de6b2a2ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_019d8c5b-12d1-7a1f-abca-cbd2464b5882" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d8c5b-12d1-7072-8bd0-958373f9bbe6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_019d8c5b-12d1-7a1f-abca-cbd2464b5882" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_019d8c5b-12d1-7004-bd11-477a5d714356" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d8c5b-12d1-7072-8bd0-958373f9bbe6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_019d8c5b-12d1-7004-bd11-477a5d714356" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019d8c5b-12d1-7fbc-990a-6ba44f864d32" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_019d8c5b-12d1-7072-8bd0-958373f9bbe6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_019d8c5b-12d1-7fbc-990a-6ba44f864d32" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.graco.com/role/RetirementBenefitsDetails" xlink:type="simple" xlink:href="ggg-20260327.xsd#RetirementBenefitsDetails"/>
  <link:definitionLink xlink:role="http://www.graco.com/role/RetirementBenefitsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019d8c5b-12d1-73d6-b772-68b73850b50f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019d8c5b-12d1-7fba-ace2-de5eeaf50288" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019d8c5b-12d1-73d6-b772-68b73850b50f" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019d8c5b-12d1-7fba-ace2-de5eeaf50288" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_019d8c5b-12d1-7966-baf3-4355ac1739a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_019d8c5b-12d1-7fba-ace2-de5eeaf50288" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_019d8c5b-12d1-7966-baf3-4355ac1739a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019d8c5b-12d1-7966-baf3-4355ac1739a9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019d8c5b-12d1-7966-baf3-4355ac1739a9" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019d8c5b-12d1-7966-baf3-4355ac1739a9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_019d8c5b-12d1-7aab-893b-3be7ef420309" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_019d8c5b-12d1-7966-baf3-4355ac1739a9" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_019d8c5b-12d1-7aab-893b-3be7ef420309" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_019d8c5b-12d1-73b8-b1a5-351df22f165a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019d8c5b-12d1-7aab-893b-3be7ef420309" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_019d8c5b-12d1-73b8-b1a5-351df22f165a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019d8c5b-12d1-7fae-9c7c-dabf5000608e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_019d8c5b-12d1-7aab-893b-3be7ef420309" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_019d8c5b-12d1-7fae-9c7c-dabf5000608e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_019d8c5b-12d1-7568-b304-88ba854d6893" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019d8c5b-12d1-73d6-b772-68b73850b50f" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_019d8c5b-12d1-7568-b304-88ba854d6893" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_019d8c5b-12d1-701d-b4d7-a7c3852eedf8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019d8c5b-12d1-73d6-b772-68b73850b50f" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_019d8c5b-12d1-701d-b4d7-a7c3852eedf8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_019d8c5b-12d1-7dc8-81a0-c494fa5f8491" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019d8c5b-12d1-73d6-b772-68b73850b50f" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_019d8c5b-12d1-7dc8-81a0-c494fa5f8491" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ggg_DefinedBenefitPlanAmortizationOfGainsLossesAndOther_019d8c5b-12d1-7a93-9e59-f5a1d67b749e" xlink:href="ggg-20260327.xsd#ggg_DefinedBenefitPlanAmortizationOfGainsLossesAndOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019d8c5b-12d1-73d6-b772-68b73850b50f" xlink:to="loc_ggg_DefinedBenefitPlanAmortizationOfGainsLossesAndOther_019d8c5b-12d1-7a93-9e59-f5a1d67b749e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_019d8c5b-12d1-75e9-8e1f-9fa4d893df67" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_019d8c5b-12d1-73d6-b772-68b73850b50f" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_019d8c5b-12d1-75e9-8e1f-9fa4d893df67" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.graco.com/role/IntangibleAssetsOtherIntangibleAssetsDetails" xlink:type="simple" xlink:href="ggg-20260327.xsd#IntangibleAssetsOtherIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.graco.com/role/IntangibleAssetsOtherIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019d8c5b-12d1-7c64-ae23-272f26b93e0b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019d8c5b-12d1-793b-98db-52836edd8f22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019d8c5b-12d1-7c64-ae23-272f26b93e0b" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019d8c5b-12d1-793b-98db-52836edd8f22" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019d8c5b-12d1-75dc-8ca4-7a016ec167a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019d8c5b-12d1-793b-98db-52836edd8f22" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019d8c5b-12d1-75dc-8ca4-7a016ec167a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d8c5b-12d1-75dc-8ca4-7a016ec167a6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019d8c5b-12d1-75dc-8ca4-7a016ec167a6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d8c5b-12d1-75dc-8ca4-7a016ec167a6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d8c5b-12d1-7b34-8241-a6b65a9c4d3a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019d8c5b-12d1-75dc-8ca4-7a016ec167a6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d8c5b-12d1-7b34-8241-a6b65a9c4d3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019d8c5b-12d1-79e1-9222-d5dee747601a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d8c5b-12d1-7b34-8241-a6b65a9c4d3a" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019d8c5b-12d1-79e1-9222-d5dee747601a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ggg_PatentsProprietaryTechnologyAndProductDocumentationMember_019d8c5b-12d1-7143-a9f3-57721d089aa6" xlink:href="ggg-20260327.xsd#ggg_PatentsProprietaryTechnologyAndProductDocumentationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d8c5b-12d1-7b34-8241-a6b65a9c4d3a" xlink:to="loc_ggg_PatentsProprietaryTechnologyAndProductDocumentationMember_019d8c5b-12d1-7143-a9f3-57721d089aa6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_019d8c5b-12d1-7391-aba7-31b610c69118" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019d8c5b-12d1-7b34-8241-a6b65a9c4d3a" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_019d8c5b-12d1-7391-aba7-31b610c69118" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019d8c5b-12d1-7cca-942d-f1f447a8eb52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019d8c5b-12d1-7c64-ae23-272f26b93e0b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_019d8c5b-12d1-7cca-942d-f1f447a8eb52" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019d8c5b-12d1-713a-ac38-01347d54120f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019d8c5b-12d1-7c64-ae23-272f26b93e0b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_019d8c5b-12d1-713a-ac38-01347d54120f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss_019d8c5b-12d1-7b8e-9ebe-5e25567746a9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019d8c5b-12d1-7c64-ae23-272f26b93e0b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss_019d8c5b-12d1-7b8e-9ebe-5e25567746a9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019d8c5b-12d1-76ce-8d64-558873ab1a8f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019d8c5b-12d1-7c64-ae23-272f26b93e0b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019d8c5b-12d1-76ce-8d64-558873ab1a8f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019d8c5b-12d1-7404-83cf-4021ed705e26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019d8c5b-12d1-7c64-ae23-272f26b93e0b" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_019d8c5b-12d1-7404-83cf-4021ed705e26" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_019d8c5b-12d1-7ea8-b1eb-a24cab60e382" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_019d8c5b-12d1-755d-933f-e60e271c2326" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_019d8c5b-12d1-7ea8-b1eb-a24cab60e382" xlink:to="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_019d8c5b-12d1-755d-933f-e60e271c2326" xlink:type="arc" order="2" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019d8c5b-12d1-7c75-b756-989ce55e1aff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfIndefiniteLivedIntangibleAssetsTable_019d8c5b-12d1-755d-933f-e60e271c2326" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019d8c5b-12d1-7c75-b756-989ce55e1aff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019d8c5b-12d1-7c75-b756-989ce55e1aff_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019d8c5b-12d1-7c75-b756-989ce55e1aff" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019d8c5b-12d1-7c75-b756-989ce55e1aff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019d8c5b-12d1-7c63-9971-8bbf26ee2fb2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019d8c5b-12d1-7c75-b756-989ce55e1aff" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019d8c5b-12d1-7c63-9971-8bbf26ee2fb2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_019d8c5b-12d1-7256-8c23-f4767d018f04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019d8c5b-12d1-7c63-9971-8bbf26ee2fb2" xlink:to="loc_us-gaap_TradeNamesMember_019d8c5b-12d1-7256-8c23-f4767d018f04" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedTradeNames_019d8c5b-12d1-79f8-b3a4-78124c6d9e3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedTradeNames"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_019d8c5b-12d1-7ea8-b1eb-a24cab60e382" xlink:to="loc_us-gaap_IndefiniteLivedTradeNames_019d8c5b-12d1-79f8-b3a4-78124c6d9e3f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss_019d8c5b-12d1-7a24-8526-16952becd286" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_019d8c5b-12d1-7ea8-b1eb-a24cab60e382" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsForeignCurrencyTranslationGainLoss_019d8c5b-12d1-7a24-8526-16952becd286" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_019d8c5b-12d1-7da7-bf9c-1c04d727ac45" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassLineItems_019d8c5b-12d1-7ea8-b1eb-a24cab60e382" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_019d8c5b-12d1-7da7-bf9c-1c04d727ac45" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.graco.com/role/IntangibleAssetsGoodwillRollforwardDetails" xlink:type="simple" xlink:href="ggg-20260327.xsd#IntangibleAssetsGoodwillRollforwardDetails"/>
  <link:definitionLink xlink:role="http://www.graco.com/role/IntangibleAssetsGoodwillRollforwardDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_019d8c5b-12d1-7057-b054-2b78653bbb70" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_019d8c5b-12d1-7216-b8dc-ceb678469eb0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_019d8c5b-12d1-7057-b054-2b78653bbb70" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_019d8c5b-12d1-7216-b8dc-ceb678469eb0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019d8c5b-12d1-7c9d-9484-76a919331b28" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_019d8c5b-12d1-7216-b8dc-ceb678469eb0" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019d8c5b-12d1-7c9d-9484-76a919331b28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019d8c5b-12d1-7c9d-9484-76a919331b28_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019d8c5b-12d1-7c9d-9484-76a919331b28" xlink:to="loc_us-gaap_SegmentDomain_019d8c5b-12d1-7c9d-9484-76a919331b28_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019d8c5b-12d1-7209-a08a-214b3d5a6fc3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019d8c5b-12d1-7c9d-9484-76a919331b28" xlink:to="loc_us-gaap_SegmentDomain_019d8c5b-12d1-7209-a08a-214b3d5a6fc3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ggg_ContractorMember_019d8c5b-12d1-78b5-81cd-e7898b503156" xlink:href="ggg-20260327.xsd#ggg_ContractorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019d8c5b-12d1-7209-a08a-214b3d5a6fc3" xlink:to="loc_ggg_ContractorMember_019d8c5b-12d1-78b5-81cd-e7898b503156" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ggg_IndustrialMember_019d8c5b-12d1-748d-a6a3-672a66cf21b2" xlink:href="ggg-20260327.xsd#ggg_IndustrialMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019d8c5b-12d1-7209-a08a-214b3d5a6fc3" xlink:to="loc_ggg_IndustrialMember_019d8c5b-12d1-748d-a6a3-672a66cf21b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ggg_ExpansionMarketsMember_019d8c5b-12d1-7734-b00e-95d95bf9edd7" xlink:href="ggg-20260327.xsd#ggg_ExpansionMarketsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019d8c5b-12d1-7209-a08a-214b3d5a6fc3" xlink:to="loc_ggg_ExpansionMarketsMember_019d8c5b-12d1-7734-b00e-95d95bf9edd7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_019d8c5b-12d1-7f3b-ba93-29e2fa37e885" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_019d8c5b-12d1-7057-b054-2b78653bbb70" xlink:to="loc_us-gaap_GoodwillRollForward_019d8c5b-12d1-7f3b-ba93-29e2fa37e885" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019d8c5b-12d1-7ca0-a18f-3de2bb06e06c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019d8c5b-12d1-7f3b-ba93-29e2fa37e885" xlink:to="loc_us-gaap_Goodwill_019d8c5b-12d1-7ca0-a18f-3de2bb06e06c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_019d8c5b-12d1-7049-8aed-08cdbb64cf2c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019d8c5b-12d1-7f3b-ba93-29e2fa37e885" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_019d8c5b-12d1-7049-8aed-08cdbb64cf2c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_019d8c5b-12d1-7447-ae6c-e9483b045852" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_019d8c5b-12d1-7f3b-ba93-29e2fa37e885" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_019d8c5b-12d1-7447-ae6c-e9483b045852" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019d8c5b-12d1-7483-a5d1-c31f38a541bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.graco.com/role/FairValueDetails" xlink:type="simple" xlink:href="ggg-20260327.xsd#FairValueDetails"/>
  <link:definitionLink xlink:role="http://www.graco.com/role/FairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019d8c5b-12d1-7252-9c8e-db641642de53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019d8c5b-12d1-74ed-ba6d-cb8f8165cb4b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019d8c5b-12d1-7252-9c8e-db641642de53" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019d8c5b-12d1-74ed-ba6d-cb8f8165cb4b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019d8c5b-12d1-7a02-8ea4-3081c7a52a0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019d8c5b-12d1-74ed-ba6d-cb8f8165cb4b" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019d8c5b-12d1-7a02-8ea4-3081c7a52a0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019d8c5b-12d1-7a02-8ea4-3081c7a52a0d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019d8c5b-12d1-7a02-8ea4-3081c7a52a0d" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019d8c5b-12d1-7a02-8ea4-3081c7a52a0d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019d8c5b-12d1-7530-b189-2eb49c6df5f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019d8c5b-12d1-7a02-8ea4-3081c7a52a0d" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019d8c5b-12d1-7530-b189-2eb49c6df5f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019d8c5b-12d1-78d2-abe7-dc26e73c5843" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019d8c5b-12d1-7530-b189-2eb49c6df5f6" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019d8c5b-12d1-78d2-abe7-dc26e73c5843" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019d8c5b-12d1-792e-a19e-252fd9d18a78" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019d8c5b-12d1-7530-b189-2eb49c6df5f6" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019d8c5b-12d1-792e-a19e-252fd9d18a78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019d8c5b-12d1-7e6e-9b74-83fd3a63da81" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019d8c5b-12d1-7252-9c8e-db641642de53" xlink:to="loc_us-gaap_AssetsAbstract_019d8c5b-12d1-7e6e-9b74-83fd3a63da81" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashSurrenderValueFairValueDisclosure_019d8c5b-12d1-7bad-af56-fd12951e93fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashSurrenderValueFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019d8c5b-12d1-7e6e-9b74-83fd3a63da81" xlink:to="loc_us-gaap_CashSurrenderValueFairValueDisclosure_019d8c5b-12d1-7bad-af56-fd12951e93fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_019d8c5b-12d1-7cdf-ba42-547fe514d804" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignCurrencyContractAssetFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019d8c5b-12d1-7e6e-9b74-83fd3a63da81" xlink:to="loc_us-gaap_ForeignCurrencyContractAssetFairValueDisclosure_019d8c5b-12d1-7cdf-ba42-547fe514d804" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019d8c5b-12d1-7543-a83b-b45db34f608b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019d8c5b-12d1-7e6e-9b74-83fd3a63da81" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019d8c5b-12d1-7543-a83b-b45db34f608b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_019d8c5b-12d1-762b-8415-684ac3a83f86" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019d8c5b-12d1-7252-9c8e-db641642de53" xlink:to="loc_us-gaap_LiabilitiesAbstract_019d8c5b-12d1-762b-8415-684ac3a83f86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019d8c5b-12d1-7bb2-b47d-f005118c3156" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019d8c5b-12d1-762b-8415-684ac3a83f86" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019d8c5b-12d1-7bb2-b47d-f005118c3156" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesFairValueDisclosure_019d8c5b-12d1-7a15-91b0-87da01026b15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019d8c5b-12d1-762b-8415-684ac3a83f86" xlink:to="loc_us-gaap_OtherLiabilitiesFairValueDisclosure_019d8c5b-12d1-7a15-91b0-87da01026b15" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_019d8c5b-12d1-78ba-8402-8489366f5e62" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019d8c5b-12d1-762b-8415-684ac3a83f86" xlink:to="loc_us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure_019d8c5b-12d1-78ba-8402-8489366f5e62" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019d8c5b-12d1-73e5-b5fb-f595ae7430d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019d8c5b-12d1-762b-8415-684ac3a83f86" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019d8c5b-12d1-73e5-b5fb-f595ae7430d6" xlink:type="arc" order="4"/>
  </link:definitionLink>
</link:linkbase>
