The Collaborative International Dictionary of English v.0.48:

Possessory \Pos*sess"o*ry\, a. [L. possessorius: cf. F.
   possessoire.]
   Of or pertaining to possession, either as a fact or a right;
   of the nature of possession; as, a possessory interest; a
   possessory lord.
   [1913 Webster]

   Possessory action or Possessory suit (Law), an action to
      regain or obtain possession of something. See under
      Petitory.
      [1913 Webster]