Definition of theism noun from the Oxford Advanced Learner's Dictionary

 

theism

 noun
noun
BrE BrE//ˈθiːɪzəm//
 
; NAmE NAmE//ˈθiːɪzəm//
 
[uncountable]
 
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belief in the existence of God or gods opposite atheism Word Origin late 17th cent.: from Greek theos ‘god’ + -ism.
See the Oxford Advanced American Dictionary entry: theism