/ Dictionary / Index A antilogism: Meaning and Definition of Find definitions for: an•til•o•gism Pronunciation: (an-til'u-jiz"um), [key] — n. Logic. a group of three inconsistent propositions, two of which are premises of a syllogism that contradict the third. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. antilogarithm antilogy Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language