/ Dictionary / Index P Protestantism: Meaning and Definition of Find definitions for: Prot•es•tant•ism Pronunciation: (prot'u-stun-tiz"um), [key] — n. the religion of Protestants. the Protestant churches collectively. adherence to Protestant principles. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: protestantism (Thesaurus) Protestant ethic Protestantize Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language