authentic

adjective5

1. •
   Of the same origin as claimed; genuine.

   • The experts confirmed it was an authentic signature.
2. •
   Conforming to reality and therefore worthy of trust, reliance, or belief.

   • The report was completely authentic.
3. •
   Designating a cadence in which the dominant chord precedes the tonic.
4. •
   Designating a mode having the final as the lowest note.
5. •
   (no longer used) Authoritative.