/ Dictionary / Index D Dufay: Meaning and Definition of Find definitions for: Du•fay Pronunciation: (d-fī' Fr. dy-fā'), [key] c1400–74, Flemish composer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. duetting duff Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language