/ Dictionary / Index S support mission: Meaning and Definition of Find definitions for: support' mis"sion Pronunciation: [key] assistance given by one military unit to another to assist in the accomplishment of the supported unit's mission. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. support level support price Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language