Definition of plagal mode
: a church mode (such as Hypophrygian or Hypomixolydian) with the same final (see 2final c) as its parallel authentic mode but with an ambitus a fourth lower A plagal mode is found a fourth below its authentic, and the final of the authentic serves also for the plagal. — Rupert Hughes, The Musical Guide, 1903 — compare authentic mode — see church mode illustration
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First Known Use of plagal mode
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