/ Dictionary / Index D defease: Meaning and Definition of Find definitions for: de•fease Pronunciation: (di-fēz'), [key] — -feased, -feas•ing. to defeat or annul (a contract, deed, etc.). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. defeasance defeasible Related Content Daily Word Quiz: clairvoyant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language