/ Dictionary / Index T Thomism: Meaning and Definition of Find definitions for: Tho•mism Pronunciation: (tō'miz-um), [key] — n. the theological and philosophical system of Thomas Aquinas. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thomism (Thesaurus) thomisid Thompson Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language