voluntarism

Concise Oxford English Dictionary © 2008 Oxford University Press:
voluntarism/ˈvɒləntərɪz(ə)m/

▶noun

• 1 the principle of relying on voluntary action.

  ■ historical the principle that the Church or schools should be independent of the state and supported by voluntary contributions.

• 2 Philosophy the doctrine that the will is a fundamental or dominant factor in the individual or the universe.

– derivatives
voluntarist noun & adjective,
voluntaristic adjective.