[aw-then-tis-i-tee, aw-thuhn-]
the quality of being authentic; genuineness.

1650–60; authentic + -ity

nonauthenticity, noun
unauthenticity, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To authenticity
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
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Example sentences
New concerns about the authenticity of old wines were raised again this week.
But music archaeologists often question the authenticity of such performances.
Arguments over history and authenticity would be honed further by the fourth
  great migration.
But the research has received mixed reactions from area paleontologists, with
  some doubting the tracks' authenticity.
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