DICT.TW Dictionary Taiwan

 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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 plagal cadence
      n : a cadence (frequently ending church music) in which the
          chord of the subdominant precedes the chord of the tonic
          [syn: amen cadence]