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1885, in the meaning defined above
borrowed from French fidéisme, from Latin fidēs "trust, belief, faith" + French -isme -ism — more at faith entry 1
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“Fideism.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fideism. Accessed 25 May. 2020.
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