plagal

[pley-guhl]
adjective Music.
(of a Gregorian mode) having the final in the middle of the compass. Compare authentic ( def 5a ).

Origin:
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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plagal (ˈpleɪɡəl)
 
adj
1.  (of a cadence) progressing from the subdominant to the tonic chord, as in the Amen of a hymn
2.  (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 counterparts: the Hypodorian mode
 
[C16: from Medieval Latin plagālis, from plaga, perhaps from Greek plagos side]

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Example sentences for plagal
The second, fourth and second plagal tones all use the soft chromatic scale.
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