Authentic
Authentic ({not transcribed}) , adjective
[Old English autentik, Old French autentique, French authentique, Latin authenticus coming from the real author, of original or firsthand authority, from Greek {not transcribed}, from {not transcribed} suicide, a perpetrator or real author of any act, an absolute master; a'yto`s self + a form "enths (not found), akin to Latin sons and perh. orig. from the present participle of e'i^nai to be, root as, and meaning the one it really is. See Am, Sin, n., and compare Effendi.]
1.
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.
To be avenged
On him who had stole Jove's authentic fire.
2.
Authoritative. [Obsolete] — Milton
3.
Of approved authority; true; trustworthy; credible; as, an authentic writer; an authentic portrait; authentic information.
4.
(Law) Vested with all due formalities, and legally attested.
5.
(Music) 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.
A genuine book is that which was written by the person whose name it bears, as the author of it. An authentic book is that which relates matters of fact as they really happened. A book may be genuine without being, authentic, and a book may be authentic without being genuine.
It may be said, however, that some writers use authentic (as, an authentic document) in the sense of “produced by its professed author, not counterfeit.”
Authentic , noun
An original (book or document). [Obsolete]
Authentics and transcripts.