/ Dictionary / Index Z Zoroastrianism: Meaning and Definition of Find definitions for: Zo•ro•as•tri•an•ism Pronunciation: (zôr"ō-as'trē-u-niz"um, zōr"-), [key] — n. an Iranian religion, founded c600b.c.by Zoroaster, the principal beliefs of which are in the existence of a supreme deity, Ahura Mazda, and in a cosmic struggle between a spirit of good, Spenta Mainyu, and a spirit of evil, Angra Mainyu. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: zoroastrianism (Thesaurus) Zoroastrian Zorobabel Related Content Daily Word Quiz: candor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language