/ Dictionary / Index P plagal cadence: Meaning and Definition of Find definitions for: pla'gal ca'dence Pronunciation: [key] — Music. Music. a cadence in which the chord of the tonic is preceded by that of the subdominant. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. plagal plage Related Content Daily Word Quiz: cur Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language