- designating a mode having a range about a fifth above and a fifth below a control note
- designating a cadence with the subdominant chord immediately preceding the tonic chord, as in the amen of a religious hymn
Origin: ML plagalis < plaga, plagal mode < MGr plagios, plagal (in Gr, oblique, slanting) < Gr plagos, a side, akin to pelagos, the sea: see pelagic
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Origin: Medieval Latin plagālis, from plaga, plagal mode, from plagius, plagal, from Medieval Greek plagios (ēkhos), plagal (mode), from Greek, oblique, from plagos, side; see plāk-1 in Indo-European roots.