/ Dictionary / Index M M.Sc.: Meaning and Definition of Find definitions for: M.Sc. Pronunciation: [key] Master of Science. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: msc (Thesaurus) M.S.Bus. M.Sc.D. Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language