/ Dictionary / Index I impair: Meaning and Definition of Find definitions for: im•pair Pronunciation: (im-pâr'), [key] — v.t. to make or cause to become worse; diminish in ability, value, excellence, etc.; weaken or damage: to impair one's health; to impair negotiations. —v.i. to grow or become worse; lessen. —n. impairment. im•pair Pronunciation: (an-per'), [key] — adj. French. noting any odd number, esp. in roulette. Cf. pair. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: impair (Thesaurus) impact wrench impaired Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language