mon‧o‧the‧is‧m /ˈmɒnəʊθiːɪz
əm $ ˈmɑːnə-/
noun [uncountable] the belief that there is only one God ⇒
polytheism—monotheist noun [countable]—monotheistic /ˌmɒnəʊθiˈɪstɪk◂ $ ˌmɑːnə-/
adjective:
monotheistic religions [TahlilGaran] Dictionary of Contemporary English ▲