Pronunciation: (di-fēt'),[key] —v.t. 1. to overcome in a contest, election, battle, etc.; prevail over; vanquish: They defeated the enemy. She defeated her brother at tennis. 2. to frustrate; thwart.
3. to eliminate or deprive of something expected: The early returns defeated his hopes of election. 4. Law.to annul.
—n. 1. the act of overcoming in a contest: an overwhelming defeat of all opposition. 2. an instance of defeat; setback: He considered his defeat a personal affront. 3. an overthrow or overturning; vanquishment: the defeat of a government. 4. a bringing to naught; frustration: the defeat of all his hopes and dreams. 5. the act or event of being bested; losing: Defeat is not something she abides easily. 6. Archaic.undoing; destruction; ruin.