Definition of necessitarian in English:

necessitarian

Pronunciation /nəˌsesəˈterēən/ /nəˌsɛsəˈtɛriən/

noun

Philosophy
  • A person who believes that human conduct is dictated by force of circumstance (as opposed to free will).

adjective

Philosophy
  • Relating to the belief that human conduct is dictated by force of circumstance (as opposed to free will).

Origin

Mid 18th century from necessity + -arian.