- 1
The quality of being genuine or not corrupted from the original, of having the same origin (or attribution, commitment, intention, etc.) as claimed.uncountableusually
- I hereby certify the authenticity of this copy.
- The authenticity of this painting is questionable.
- 2
The quality of being authentic (of established authority).obsoleteuncountableusually
ant. phoniness · forgery · fakeness · bogosity