Pronunciation: (ô-then'tik), [key]
1. not false or copied; genuine; real: an authentic antique.
2. having the origin supported by unquestionable evidence; authenticated; verified: an authentic document of the Middle Ages; an authentic work of the old master.
3. entitled to acceptance or belief because of agreement with known facts or experience; reliable; trustworthy: an authentic report on poverty in Africa.
4. Law.executed with all due formalities: an authentic deed.
a. (of a church mode) having a range extending from the final to the octave above. Cf. plagal.
b. (of a cadence) consisting of a dominant harmony followed by a tonic.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.