noun.
The quality or condition of being authentic, trustworthy, or genuine.
The Century Dictionary and Cyclopedia
noun.
The quality of being authentic, or entitled to acceptance as authoritative, genuine, true, or correct: as, the authenticity of the Scriptures or of a document; the authenticity of a portrait; the authenticity of a statement.
the GNU version of the Collaborative International Dictionary of English
noun.
The quality of being authentic or of established authority for truth and correctness.
noun.
Genuineness; the quality of being genuine or not corrupted from the original.
noun.
The quality of being genuine or not corrupted from the original.
noun.
Truthfulness of origins, attributions, commitments, sincerity, and intentions.
noun.
The quality of being authentic (of established authority).
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
undisputed credibility
Word Usage
"The only viable option I see to maintain authenticity is to get an older, more muscular actor who looks sort of like Taylor to play Jacob in New Moon."