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plagal

[ pley-guhl ]
/ ˈpleɪ gəl /
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adjective Music.

(of a Gregorian mode) having the final in the middle of the compass.Compare authentic (def. 6a).

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Origin of plagal

1590–1600; <Medieval Latin plagālis, equivalent to plag(a) plagal mode (apparently back formation from plagius plagal; see plage) + -ālis-al1
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British Dictionary definitions for plagal

plagal
/ (ˈpleɪɡəl) /

adjective

(of a cadence) progressing from the subdominant to the tonic chord, as in the Amen of a hymn
(of a mode) 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 counterpartsthe Hypodorian mode

Word Origin for plagal

C16: from Medieval Latin plagālis, from plaga, perhaps from Greek plagos side
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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