monotheism
noun/ˈmɒnəʊθiɪzəm/
/ˈmɑːnəʊθiɪzəm/
[uncountable]- the belief that there is only one God compare polytheismTopics Religion and festivalsc2Word Originmid 17th cent.: from mono- ‘one’ + Greek theos ‘god’ + -ism.
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monotheism