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Definition of authentic


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au·then·tic  audio  (ô-thntk) KEY 

ADJECTIVE:
  1. Conforming to fact and therefore worthy of trust, reliance, or belief: an authentic account by an eyewitness.
  2. Having a claimed and verifiable origin or authorship; not counterfeit or copied: an authentic medieval sword.
  3. Law Executed with due process: an authentic deed.
  4. Music
    1. Of, relating to, or being a medieval mode having a range from its final tone to the octave above it.
    2. Of, relating to, or being a cadence with the dominant chord immediately preceding the tonic chord.
  5. Obsolete Authoritative.

ETYMOLOGY:
Middle English autentik, from Old French autentique, from Late Latin authenticus, from Greek authentikos, from authents, author

OTHER FORMS:
au·thenti·cal·ly(Adverb)

SYNONYMS:
authentic, bona fide, genuine, real1, true, undoubted, unquestionable

These adjectives mean not counterfeit or copied: an authentic painting by Corot; a bona fide transfer of property; genuine crabmeat; a real diamond; true courage; undoubted evidence; an unquestionable antique.
Antonym: counterfeit


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