Authenticity Definition

ôthĕn-tĭsĭ-tē
noun
The quality or condition of being authentic, trustworthy, or genuine.
American Heritage
The quality or state of being authentic; reliability; genuineness.
Webster's New World

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

I hereby certify the authenticity of this copy.
Wiktionary
Truthfulness of origins, attributions, commitments, sincerity, and intentions.
The authenticity of this painting is questionable.
Wiktionary

Other Word Forms of Authenticity

Noun

Singular:
authenticity
Plural:
authenticities

Origin of Authenticity

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authenticity