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authentic
plagal (in music):

of a cadence:

1. (of a cadence) progressing from the subdominant to the tonic chord, as in the Amen of a hymn.

2. (of a cadence) progressing from the subdominant chord to the tonic.

of a mode:

1. commencing upon the dominant of an authentic mode, but sharing the same final as the authentic mode. 

Plagal modes are designated by the prefix Hypo- before the name of their authentic counterparts:
the Hypodorian mode.

2. (of a Gregorian mode) having the final in the middle of the compass. Compare authentic. 

3. (of a church mode) having the keynote on the fourth scale step.

Origin:

1300–50; <Late Latin authenticus “coming from the author, genuine” (also in the neuter, a noun “original document, the original”) <Greek authentikós “original, primary, at first hand,” equivalent to authént(ēs) “one who does things himself” (aut- aut- +-hentēs “doer”) + -ikos -ic; replacing Middle English autentik (<Anglo-French ) <Medieval Latin autenticus. British dictionary: C14: from Late Latin authenticus coming from the author, from Greek authentikos, from authentēs one who acts independently, from auto- + hentēs a doer. —Dictionary.com. // 

 First Known Use of authentic: 14th century. History and Etymology for authentic: Middle English autentik, from Anglo-French, from Late Latin authenticus, from Greek authentikos, from authentēs perpetrator, master, from aut- + -hentēs (akin to Greek anyein to accomplish, Sanskrit sanoti he gains). —Merriam-Webster.

Sources: 1, 2.

Added: 7 August 2020 {4:19 PM}
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