not false or copied; genuine; real: an authentic antique.
having the origin supported by unquestionable evidence; authenticated; verified: an authentic document of the Middle Ages; an authentic work of the old master.
entitled to acceptance or belief because of agreement with known facts or experience; reliable; trustworthy: an authentic report on poverty in Africa.
Law. executed with all due formalities: an authentic deed.
(of a church mode) having a range extending from the final to the octave above. Compare plagal.
(of a cadence) consisting of a dominant harmony followed by a tonic.
Obsolete, authoritative.

1300–50; < Late Latin authenticus < Greek authentikós original, primary, at first hand, equivalent to authént(ēs) one who does things himself (aut- aut- + -hentēs doer) + -ikos -ic; replacing Middle English autentik (< Anglo-French) < Medieval Latin autenticus

authentically, adverb
nonauthentic, adjective
quasi-authentic, adjective
quasi-authentically, adverb
unauthentic, adjective

1–3. Authentic, genuine, real, veritable share the sense of actuality and lack of falsehood or misrepresentation. Authentic carries a connotation of authoritative certification that an object is what it is claimed to be: an authentic Rembrandt sketch. Genuine refers to objects or persons having the characteristics or source claimed or implied: a genuine ivory carving. Real the most general of these terms, refers to innate or actual—as opposed to ostensible—nature or character: In real life, plans often miscarry. A real diamond will cut glass. Veritable derived from the Latin word for truth, suggests the general truthfulness but not necessarily the literal or strict correspondence with reality of that which it describes; it is often used metaphorically: a veritable wizard of finance. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
authentic (ɔːˈθɛntɪk)
1.  of undisputed origin or authorship; genuine: an authentic signature
2.  accurate in representation of the facts; trustworthy; reliable: an authentic account
3.  (of a deed or other document) duly executed, any necessary legal formalities having been complied with
4.  music
 a.  using period instruments and historically researched scores and playing techniques in an attempt to perform a piece as it would have been played at the time it was written
 b.  (in combination): an authentic-instrument performance
5.  music Compare plagal
 a.  (of a mode as used in Gregorian chant) commencing on the final and ending an octave higher
 b.  (of a cadence) progressing from a dominant to a tonic chord
[C14: from Late Latin authenticus coming from the author, from Greek authentikos, from authentēs one who acts independently, from auto- + hentēs a doer]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

mid-14c., "authoritative," from O.Fr. autentique (13c.), from M.L. authenticus, from Gk. authentikos "original, genuine, principal," from authentes "one acting on one's own authority," from autos "self" + hentes "doer, being." Sense of "entitled to acceptance as factual" is first recorded mid-14c. Authentic
implies that the contents of the thing in question correspond to the facts and are not fictitious; genuine implies that the reputed author is the real one. Related: Authenticity (1650s, in form authentity).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
All the real things, the authentic things, the honest things are dying off.
It was, at one and the same time, a genuine revolution and an authentic
His supporters insist he is brave, authentic and in tune with plain-talking
  local attitudes.
The kitchen of this unprepossessing restaurant turns out stylish versions of
  authentic bistro-grill dishes.
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