something which validates or confirms the authenticity of something / (computing) proof of the identity of a user logging on to some network / a hallmark or assay-mark on a piece of metalwork

plural of authentication

Third-person singular simple present indicative form of authenticate

present participle of authenticate

plural of authenticity

One who authenticates. / A feature that shows something to be authentic. / (film, television) A person employed to check the accuracy and realism of a script.

plural of authenticator

past participle of authenticate

Of the same origin as claimed; genuine. / Conforming to reality and therefore worthy of trust, reliance, or belief. / (music, of a Gregorian mode) Having the final as the lowest note of the mode.

The quality of being genuine or not corrupted from the original, of having the same origin (or attribution, commitment, intention, etc.) as claimed.