certify
transitive verb | \ ˈsər-tə-ˌfī \ | cer·ti·fy
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a : to give assurance of the validity of certify corporate records
b : to designate (a labor union) as an exclusive bargaining agent or representative
c : to state as being true or as reported or as meeting a standard refused to certify the suit as a class action and dismissed it —Marcia Coyle
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: to guarantee (a personal check) as to signature and amount by so indicating (as by stamping certified) on the face — see also certified check at check
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a : certificate, license
b : to designate (a labor union) as an exclusive bargaining agent or representative