Zoroastrianism
noun
                                                                                                                            
                                                            Zo·ro·as·tri·an·ism
                    
                                                                                                              
                                                                                                                                  ˌzȯr-ə-ˈwa-strē-ə-ˌni-zəm  
                                                      
                                                          
            
                                
              
          
                                                      : 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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