## Etymology
From authentic + -ally. Authentic derives via Old French autentique and Late Latin authenticus from Ancient Greek authentikos ('genuine, principal'), from authentes ('one acting on one's own authority').

## AI Etymology
Authentically is an adverb meaning "in a genuine or true manner". Historically, it is from authentic + -ally. Authentic derives via Old French autentique and Late Latin authenticus from Ancient Greek authentikos ('genuine, principal'), from authentes ('one acting on one's own authority'). The visible construction is part of the etymology: authentically is not just an unanalyzed simple word. The modern meaning, "in a genuine or true manner", follows the base word through the added English ending. The historical chain links Ancient Greek authentikos with Ancient Greek authentes. Close English family members include authentic, authenticity, authenticate, and authentication.

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