From Longman Dictionary of Contemporary Englishmonotheismmon‧o‧the‧is‧m /ˈmɒnəʊθiːɪzəm $ ˈmɑːnə-/ noun [uncountable] RRthe belief that there is only one God → polytheism —monotheist noun [countable] —monotheistic /ˌmɒnəʊθiˈɪstɪk◂ $ ˌmɑːnə-/ adjective monotheistic religions
Examples from the Corpus
monotheism• But for much else in polytheism and monotheism it is of more limited value.• The compulsive drive towards a mystical mode of religion is particularly interesting in the three faiths of historical monotheism.• By the Edict of Milan, promulgated in 313, he forbade persecution of all forms of monotheism in the Empire.• Pure monotheism was by then securely established in the Second Temple of Jerusalem, but remained shaky elsewhere. 