/ Dictionary / Index U use immunity: Meaning and Definition of Find definitions for: use' immu"nity Pronunciation: (ys), [key] — Law. Law. a type of immunity guaranteeing that the testimony of the witness will not be used as evidence against him or her in court, although he or she can still be prosecuted on evidence of others. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. useful useless Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language