1. Conforming to fact and therefore worthy of trust, reliance, or belief: an authentic account by an eyewitness.
2. Being so in fact; not fraudulent or counterfeit: an authentic medieval sword.
3. Law Executed in a manner so as to produce legal effectiveness: an authentic deed.
a. Of, relating to, or being a medieval mode having a range from its final tone to the octave above it.
b. Of, relating to, or being a cadence with the dominant chord immediately preceding the tonic chord.
5. Obsolete Authoritative.
[Middle English autentik, from Old French autentique, from Late Latin authenticus, from Greek authentikos, from authentēs, author, master : autos, self + -hentēs, accomplisher, achiever; akin to Attic Greek hanutein, to accomplish, variant of Greek anuein.]
Synonyms: authentic, bona fide, genuine, real1, true, unquestionable
These adjectives mean not counterfeit or copied: an authentic painting by Monet; a bona fide transfer of property; genuine crabmeat; a real diamond; true courage; an unquestionable antique.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.