authentic

adjective

• 1of undisputed origin and not a copy; genuine:the letter is now accepted as an authentic document
• made or done in the traditional or original way, or in a way that faithfully resembles an original:the restaurant serves authentic Italian meals every detail of the film was totally authentic
• based on facts; accurate or reliable:an authentic depiction of the situation
• (in existentialist philosophy) relating to or denoting an emotionally appropriate, significant, purposive, and responsible mode of human life.

• 2 Music (of a church mode) containing notes between the final (the principal note) and the note an octave higher. Compare with plagal.