pla·gal /ˈplegəl/
Pla·gal a. Mus. 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.
Plagal cadence, a cadence in which the final chord on the tonic is preceded by the chord on the subdominant.
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