/ Dictionary / Index M Marcionism: Meaning and Definition of Find definitions for: Mar•cion•ism Pronunciation: (mär'shu-niz"um), [key] — n. the doctrines and principles of the Marcionites. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: marcionism (Thesaurus) Marcion Marcionite Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language