/ Dictionary / Index M mim: Meaning and Definition of Find definitions for: mim Pronunciation: (mim), [key] — adj. Brit. Dial. primly modest or demure. mīm Pronunciation: (mēm), [key] — n. the twenty-fourth letter of the Arabic alphabet. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Milyukov Mimamsa Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language