authenticate - definition and synonyms

verb [transitive] 

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/ɔːˈθentɪkeɪt/
present tense
I/you/we/theyauthenticate
he/she/itauthenticates
present participleauthenticating
past tenseauthenticated
past participleauthenticated
  1. to prove or show that something is real and not false or copied