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The Collaborative International Dictionary
Necessarianism

Necessarianism \Nec`es*sa"ri*an*ism\, n. The doctrine of philosophical necessity; necessitarianism.
--Hixley.

Wiktionary
necessarianism

n. (context philosophy metaphysics theology English) An extreme form of determinism that holds that all phenomenon, including the will, are subject to immutable rules of cause and effect; necessitarianism.