/ Dictionary / Index M messaging: Meaning and Definition of Find definitions for: mes•sag•ing Pronunciation: (mes'u-jing), [key] — n. a system or process of transmitting messages, esp. electronically, by computer, telephone, television cable, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: messaging (Thesaurus) message unit Messalian Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language