authenticity

/ˌɔːθenˈtɪsəti/ noun [U]

Definition

› the quality of being real or true: Many people now question the authenticity of his claims.ensure/guarantee sth's authenticity Digital signatures ensure the authenticity of your documents.check/verify sth's authenticity They showed the documents to several experts to verify their authenticity.

(Definition of authenticity noun from the Cambridge Business English Dictionary © Cambridge University Press)

Focus on the pronunciation of authenticity