/ Dictionary / Index M M.S.I.E.: Meaning and Definition of Find definitions for: M.S.I.E. Pronunciation: [key] Master of Science in Industrial Engineering. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. MSI m'sieur* 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