the belief in one God as the creator and ruler of the universe, without rejection of revelation (distinguished from deism ).
belief in the existence of a god or gods (opposed to atheism ).

1670–80; the- + -ism

theist [thee-ist] , noun, adjective
theistic, theistical, adjective
theistically, adverb
nontheistic, adjective
nontheistical, adjective
nontheistically, adverb
untheistic, adjective
untheistical, adjective
untheistically, adverb

atheist, deist, theist.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
theism (ˈθiːɪzəm)
1.  Compare deism the form of the belief in one God as the transcendent creator and ruler of the universe that does not necessarily entail further belief in divine revelation
2.  Compare atheism the belief in the existence of a God or gods
[C17: from Greek theos god + -ism]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"belief in a deity," 1670s; see theist. Meaning "belief in one god" (as opposed to polytheism) is recorded from 1711.
Online Etymology Dictionary, © 2010 Douglas Harper
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