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Webster's 1913 dictionary defines authenticity as

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 genuineness.

The meaning has been extended to computing, especially cryptography, wherein authentification is used as a word for the process of determining whether access is valid.

Authenticity is also a term in philosophy.