Definition of Zoroastrianism noun from the Oxford Advanced American Dictionary

 

Zoroastrianism

 noun
noun
NAmE//ˌzɔroʊˈæstriəˌnɪzəm//
 
[uncountable]
 
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a religion started in ancient Persia by Zoroaster, that teaches that there is one God and a continuing struggle in the world between forces of light and dark
Zoroastrian
 
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NAmE//ˌzɔroʊˈæstriən//
 
noun, adjective see also Parsee
See the Oxford Advanced Learner's Dictionary entry: Zoroastrianism