Au*then"tic*al*ly, adv. In an authentic manner; with the requisite or genuine authority.
Au*then*tic*al*ness, n. The quality of being authentic; authenticity. [R.] Barrow.
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.
Au`then*tic"i*ty (&?;), n. [Cf. F. authenticité.] 1. The quality of being authentic or of established authority for truth and correctness.