/ ɔːˈθentɪkeɪt; NAmE / verb
[ vn ] authenticate sth (as sth) to prove that sth is genuine, real or true :
The letter has been authenticated by handwriting experts.
Experts have authenticated the writing as that of Byron himself.
► au·then·ti·ca·tion / ɔːˌθentɪˈkeɪʃn; NAmE / noun [ U ]
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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.