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.
Note: ☞ 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.
n : undisputed credibility [syn: genuineness, legitimacy]