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Authenticity (noun)
The quality of being genuine or not corrupted from the original.
“I hereby certify the authenticity of this copy.”
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Authenticity (noun)
Truthfulness of origins, attributions, commitments, sincerity, and intentions.
“The authenticity of this painting is questionable.”
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Authenticity (noun)
The quality of being authentic (of established authority).
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Authenticness (noun)
The quality of being authentic; authenticity.
Wiktionary