undisputed credibility
"The historian's claim gained authenticity when ancient documents corroborated every detail of his account."
The quality of being genuine or not corrupted from the original.
"The authenticity of the ancient manuscript was confirmed by its unique ink and handwriting style that matched historical records."
In plain English: Authenticity is being genuine and true to who you really are instead of pretending to be someone else.
"The museum curator examined every detail to verify the painting's authenticity before putting it on display."
Usage: Use this term to describe the genuineness of an object, artwork, or experience rather than a person's character traits. It often pairs with "in question" when verifying whether something is real or has been altered.
Authenticity comes from combining the word authentic with the suffix -ity to form a noun describing the quality of being genuine. The term entered English through French and Latin roots, evolving specifically to denote originality or truthfulness rather than just meaning "true."