Akademik

verb /ɔ.ˈθɛn.tɪ.keɪt,ɑ.ˈθɛn.tɪ.keɪt/

a) To render authentic; to give authority to, by the proof, attestation, or formalities required by law, or sufficient to entitle to credit.

b) To prove authentic; to determine as real and true; as, to authenticate a portrait.