The fact or quality of being genuine; = authenticity, n. 3a.

Of a literary work: the fact that it is the work of its reputed author; authenticity, genuineness. Now rare.

Genuineness (of a passage). Obsolete. rare.

esp. The quality of being what it professes to be in origin or authorship; = authenticity, n. 3a.

With reference to a document, artefact, artwork, etc.: the fact or quality of being authentic (authentic, adj. 7a); genuineness.