zoroastrianism Meaning, Definition & Usage

  1. noun system of religion founded in Persia in the 6th century BC by Zoroaster; set forth in the Zend-Avesta; based on concept of struggle between light (good) and dark (evil)
    Mazdaism.

WordNet

Zo`ro*as"tri*an*ism noun
Definitions
  1. The religious system of Zoroaster, the legislator and prophet of the ancient Persians, which was the national faith of Persia; mazdeism. The system presupposes a good spirit (Ormuzd) and an opposing evil spirit (Ahriman). Cf. Fire worship, under Fire, and Parsee.

Webster 1913