/ Dictionary / Index B briefing: Meaning and Definition of Find definitions for: brief•ing Pronunciation: (brē'fing), [key] — n. a short, factual oral summary of the details of a current or projected military operation given to the participants or observers. any set of concise instructions or a summary of events. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: briefing (Thesaurus) briefcase briefless Related Content Daily Word Quiz: meritocracy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language