/ Dictionary / Index P plagal: Meaning and Definition of Find definitions for: pla•gal Pronunciation: (plā'gul), [key] — adj. Music. (of a Gregorian mode) having the final in the middle of the compass. Cf.(def. 5a). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. plafond plagal cadence 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