Au`then*tic"i*ty (?), n. [Cf. F. authenticit'e.]
1.
The quality of being authentic or of established authority for truth and correctness.
2.
Genuineness; the quality of being genuine or not corrupted from the original.
⇒ In later writers, especially those on the evidences of Christianity, authenticity is often restricted in its use to the first of the above meanings, and distinguished from qenuineness.
© Webster 1913.