au·then·tic
[aw-then-tik]
–adjective
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.
5.Music .
a.(of a church mode) having a range extending from the final to the octave above. Compare plagal.
b.(of a cadence) consisting of a dominant harmony followed by a tonic.
6.Obsolete . authoritative.