/ Dictionary / Index C Catholicism: Meaning and Definition of Find definitions for: Ca•thol•i•cism Pronunciation: (ku-thol'u-siz"um), [key] — n. the faith, system, and practice of the Catholic Church, esp. the Roman Catholic Church. (l.c.) catholicity. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: catholicism (Thesaurus) Catholic Epistles catholicity Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language