(ˌzɒrəʊˈæstrɪənˌɪzəm) or Zoroastrism (ˌzɒrəʊˈæstrɪzəm)
noun
the dualistic religion founded by the Persian prophet Zoroaster in the late 7th or early 6th centuries bc and set forth in the sacred writings of the Zend-Avesta. It is based on the concept of a continuous struggle between Ormazd (or Ahura Mazda), the god of creation, light, and goodness, and his arch enemy, Ahriman, the spirit of evil and darkness, and it includes a highly developed ethical code
Also called: Mazdaism
Zoroastrianism in American English
(ˌzoʊroʊˈæstriənˌɪzəm; ˌzɔroʊˈæstriənˌɪzəm)
noun
the religious system of the Persians before their conversion to Islam: it was founded by Zoroaster, and its principles, contained in the Avesta, include belief in an afterlife and in the continuous struggle of the universal spirit of good (Ormazd) with the spirit of evil (Ahriman), the good ultimately to prevail