Authenticity
WordNet
noun
(1) Undisputed credibility
WiktionaryText
Noun
- The quality of being genuine or not corrupted from the original.
- I hereby certify that this is an authentic copy.
- Truthfulness of origins, attributions, commitments, sincerity, and intentions.
- The painting was not authentic after all; it was just a copy.
- The quality of being authentic (of established authority).