[ɔːˈθɛntɪk], (Adjective)

Definitions:
- of undisputed origin and not a copy; genuine
(e.g: the letter is now accepted as an authentic document)

- (of a church mode) containing notes between the final (the principal note) and the note an octave higher


Phrases:

Origin:
late Middle English: via Old French from late Latin authenticus, from Greek authentikos ‘principal, genuine’