/ Dictionary / Index M mutate: Meaning and Definition of Find definitions for: mu•tate Pronunciation: (my'tāt), [key] — v., -tat•ed, -tat•ing. —v.t. to change; alter. to change by umlaut. —v.i. to change; undergo mutation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mutate (Thesaurus) mutarotation mutation Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language