/ Dictionary / Index M matrixing: Meaning and Definition of Find definitions for: ma•trix•ing Pronunciation: (mā'trik-sing), [key] — n. an electronic method of processing quadraphonic sound for recording in a two-channel form, for reconversion to four channels when played back. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. matrix matrix mechanics Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language