/ Dictionary / Index R rigorism: Meaning and Definition of Find definitions for: rig•or•ism Pronunciation: (rig'u-riz"um), [key] — n. extreme strictness. (in Roman Catholic moral philosophy) the theory that in doubtful cases of conscience no course may be followed that is contrary to Catholic law and doctrine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rigor rigor mortis Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language