/ ˈmɒnəʊθiɪzəm; NAmE ˈmɑːnoʊ-/ noun
[ U ] the belief that there is only one God
—compare polytheism
► mono·the·ist / ˈmɒnəʊθiɪst; NAmE ˈmɑːnoʊ-/ noun
► mono·the·is·tic / ˌmɒnəʊθiˈɪstɪk; NAmE ˌmɑːnoʊ-/ adjective
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WORD ORIGIN
mid 17th cent.: from mono- one + Greek theos god + -ism .