/ Dictionary / Index M minus sign: Meaning and Definition of Find definitions for: mi'nus sign" Pronunciation: [key] the symbol (−) denoting subtraction or a negative quantity. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. minus sight minus tick Related Content Daily Word Quiz: fresco Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language