Definition of authenticate verb from the Oxford Advanced Learner's Dictionary

 

authenticate

 verb
verb
BrE BrE//ɔːˈθentɪkeɪt//
 
; NAmE NAmE//ɔːˈθentɪkeɪt//
 
Verb Forms present simple I / you / we / they authenticate
BrE BrE//ɔːˈθentɪkeɪt//
 
; NAmE NAmE//ɔːˈθentɪkeɪt//
 
he / she / it authenticates
BrE BrE//ɔːˈθentɪkeɪts//
 
; NAmE NAmE//ɔːˈθentɪkeɪts//
 
past simple authenticated
BrE BrE//ɔːˈθentɪkeɪtɪd//
 
; NAmE NAmE//ɔːˈθentɪkeɪtɪd//
 
past participle authenticated
BrE BrE//ɔːˈθentɪkeɪtɪd//
 
; NAmE NAmE//ɔːˈθentɪkeɪtɪd//
 
-ing form authenticating
BrE BrE//ɔːˈθentɪkeɪtɪŋ//
 
; NAmE NAmE//ɔːˈθentɪkeɪtɪŋ//
 
 
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to prove that something is genuine, real or true authenticate something The letter has been authenticated by handwriting experts. authenticate something as something Experts have authenticated the writing as that of Byron himself. Word Origin early 17th cent.: from medieval Latin authenticat- ‘established as valid’, from the verb authenticare, from late Latin authenticus ‘genuine’, from Greek authentikos ‘principal, genuine’.
See the Oxford Advanced American Dictionary entry: authenticate