To prove or confirm that something is genuine, real, or true; to verify the authorship or origin of something.
From Greek 'authentikos' meaning 'original, genuine,' from 'authentes' (one who acts independently). The word literally meant 'self-authored' and evolved to mean proving something is what it claims to be.
Think 'AUTHOR-ticate' - you're proving who the real author is! Just like checking someone's ID to prove they're authentic, you authenticate documents, art, or claims.
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