-theismcomb. form
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Primary stress is either attracted to the first syllable of this combining form or retained by the usual stressed syllable of the preceding element. Vowels may be reduced accordingly.
Origin: A borrowing from French. Etymon: French -théisme.
Etymology: < Middle French, French -théisme (in e.g. athéisme atheism n.) < ancient Greek θεός god (see theo- comb. form) + Middle French, French -isme -ism suffix. Compare post-classical Latin -theismus.Earliest in borrowings and adaptations from French, as atheism n., polytheism n.; compare also autotheism n. Formations within English are found apparently from the second half of the 17th cent., earliest in monotheism n. Compare the slightly later simplex noun theism n.1
This is a new entry (OED Third Edition, November 2010; most recently modified version published online December 2018).