necessitarian

[nuh-ses-i-tair-ee-uh n]

noun

a person who advocates or supports necessitarianism (distinguished from libertarian).

adjective

Origin of necessitarian

First recorded in 1790–1800; necessit(y) + -arian

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Conduct, according to the necessitarian, depends on knowledge.
Short Studies on Great Subjects
James Anthony Froude
An intimate friend of his was a necessitarian—that's the term, is it not?
The Catholic World, Vol. X, October 1869
Various
It is the latter hypothesis which is expressed by the necessitarian theory.
Evolution
Frank B. Jevons
How can the Necessitarian account for such facts in consistency with his theory?
Doctrine of the Will
Asa Mahan
I cannot deny, the Necessitarian replies, that you have correctly stated this doctrine.
Doctrine of the Will
Asa Mahan

1754, from necessity + -arian. As an adjective from 1739. Related: Necessitarianism.