Plagal is valid Scrabble Word

Is plagal a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is plagal valid Words with Friends?
Words with Friends YES

6 letters word
9 points in Scrabble
13 points in WWF

Definitions for PLAGAL in dictionary:

ADJECTIVE:

designating a medieval musical mode
(of a church mode) containing notes between the dominant and the note an octave higher.
(of a cadence) progressing from the subdominant to the tonic chord
Having a scale running from the dominant to its octave; -- said of certain old church modes or tunes, as opposed to those called authentic, which ran from the tonic to its octave.

How to use PLAGAL in a sentence

Thus the melody itself was said to be either authentic or plagal, according to whether it had one or two tonics.

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