au·then·tic [aw théntik, ? théntik] adjective 1. not false or copied: genuine and original, as opposed to being a fake or reproduction 2. trustworthy: shown to be true and trustworthy 3. law valid: legally valid because all necessary procedures have been followed correctly 4. music in style of original period: performed in the musical style current at the time of composition, and on instruments similar to those of the time 5. music christianity with upward range from main note: describes church music such as Gregorian chant that has an upward range from the keynote of the scale [14th century. Via French < Greek authentikos "genuine" < authentes "master, doer" < autos "self"] -au·then·ti·cal·ly, adverb