As a noun authenticity is
the quality of being genuine or not corrupted from the original.
Not English Wikidiffcom has no English definition. It may be misspelled.
The quality of being genuine or not corrupted from the original.
Truthfulness of origins, attributions, commitments, sincerity, and intentions.
- I hereby certify the authenticity of this copy.
(obsolete) The quality of being authentic (of established authority).
- The authenticity of this painting is questionable.
* (quality of being genuine) genuineness
* (quality of not being genuine) phoniness; forgery; fakeness; bogosity