
Necessitarianism is a metaphysical principle that denies all mere possibility; there is exactly one way for the world to be. It is the strongest member of a family of principles, including hard determinism, each of which deny free will, reasoning that human actions are predetermined by external or internal antecedents. Necessitarianism is stronger...
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• (n.) The doctrine of philosophical necessity; the doctrine that results follow by invariable sequence from causes, and esp. that the will is not free, but that human actions and choices result inevitably from motives; deteminism. • (n.) The doctrine of philosophical necessity; the doctrine that results follow by invariable sequence from...
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http://thinkexist.com/dictionary/meaning/necessitarianism/
Ne·ces`si·ta'ri·an·ism noun The doctrine of philosophical necessity; the doctrine that results follow by invariable sequence from causes, and esp. that the will is not free, but that human actions and choices result inevitably from motives; determinism.
M. Arnold. Found on
http://www.encyclo.co.uk/webster/N/9

a metaphysical principle that denies free will, reasoning that human actions are predetermined by external antecedents.
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(Lat. necessitas, necessity) Theory that every event in the universe is determined by logical or causal necessity. The theory excludes both physical indeterminacy (chance) and psychical indeterminacy (freedom). Necessitarianism, as a theory of cosmic necessity, becomes in its special application to the human will, determinism. See Determinism. -- ....
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the doctrine that all events, including acts of the will, are determined by antecedent causes; determinism.
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https://www.infoplease.com/dictionary/necessitarianism
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