/ Dictionary / Index M messmate: Meaning and Definition of Find definitions for: mess•mate Pronunciation: (mes'māt"), [key] — n. a person, esp. a friend, who is a member of a group regularly taking meals together, as in an army camp. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: messmate (Thesaurus) messman messroom Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language