Authentic

Webster's Dictionary of the English Language

·noun An original (book or document).

II. Authentic ·noun Authoritative.

III. Authentic ·noun Vested with all due formalities, and legally attested.

IV. Authentic ·noun Of approved authority; true; trustworthy; credible; as, an authentic writer; an authentic portrait; authentic information.

V. Authentic ·noun Having as immediate relation to the tonic, in distinction from plagal, which has a correspondent relation to the dominant in the octave below the tonic.

VI. Authentic ·noun Having a genuine original or authority, in opposition to that which is false, fictitious, counterfeit, or apocryphal; being what it purports to be; genuine; not of doubtful origin; real; as, an authentic paper or register.