/ Dictionary / Index S square of opposition: Meaning and Definition of Find definitions for: square' of opposi'tion Pronunciation: [key] — Logic. Logic. a diagrammatic representation of the opposition of categorical propositions. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. square number square one Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language