Definition of Zoroastrianism
: a Persian religion founded in the sixth century b.c. by the prophet Zoroaster, promulgated in the Avesta, and characterized by worship of a supreme god Ahura Mazda who requires good deeds for help in his cosmic struggle against the evil spirit Ahriman
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Merriam-Webster unabridged
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Time Traveler for Zoroastrianism
The first known use of Zoroastrianism was in 1849
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