Etymology
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authenticate (v.)

"verify, establish the credibility of," 1650s, from Medieval Latin authenticatus, past participle of authenticare, from Late Latin authenticus (see authentic). Also "render authentic" (1650s). Related: Authenticated; authenticating.

updated on March 05, 2017

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Definitions of authenticate from WordNet

authenticate (v.)
establish the authenticity of something;
From wordnet.princeton.edu, not affiliated with etymonline.