Au‐then″ti‐cate (�), v. t. [imp. & p. p.Authenticated (�); p. pr. & vb. n.Authenticating (�).] [Cf. LL. authenticare.] 1. To render authentic; to give authority to, by the proof, attestation, or formalities required by law, or sufficient to entitle to credit.
The king serves only as a notary to authenticate the choice of judges.
Burke.
2. To prove authentic; to determine as real and true; as, to authenticate a portrait. Walpole.