bitheismn.
/bʌɪˈθiːɪz(ə)m/ rare.
A recognition of two deities (i.e. a good and an evil).
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ditheism1678
bitheism1884
1884 L. A. Tollemache Stones of Stumbling 83 (note) , At bottom, every such system is Bitheism.
This entry has not yet been fully updated (first published 1887; most recently modified version published online March 2016).
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n.1884