/ Dictionary / Index M matter in deed: Meaning and Definition of Find definitions for: mat'ter in deed' Pronunciation: [key] a fact or statement that can be proved or established by a deed or specialty. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Matterhorn matter of course Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language