/ Thesaurus / M Synonyms of mithraicism Find synonyms for: Noun1. Mithraism, Mithraicism, religion, faith, religious beliefusage: ancient Persian religion; popular among Romans during first three centuries a.d.WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: diurnal Analogy of the Day: Today?s Analogy Spelling Bee: Today?s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language