Definition of Restitutionist in US English:

Restitutionist

noun

rare
  • 1Theology (chiefly US). A person who holds some form of the doctrine of the ‘restitution of all things’; a restorationist.

  • 2A person who advocates restitution, especially of property. Formerly also: †a person who makes restitution of another's property.

adjective

rare
  • 1Of or relating to Restitutionists; advocating belief in the ‘restitution of all things’.

  • 2Advocating restitution, especially as an essential aspect of justice.

Origin

Late 18th century. From restitution + -ist.