authenticity

/ɑθənˈtɪsɪti/

noun

  1. The quality of being genuine or not corrupted from the original.

    "I hereby certify the authenticity of this copy."

  2. Truthfulness of origins, attributions, commitments, sincerity, and intentions.

    "The authenticity of this painting is questionable."

  3. The quality of being authentic (of established authority).

Synonyms: genuineness
Antonyms: bogosity, fakeness, forgery, phoniness