The Collaborative International Dictionary of English v.0.48:

Petitory \Pet"i*to*ry\, a. [L. petitorius, fr. petere, petitum,
   to beg, ask: cf. F. p['e]titore.]
   Petitioning; soliciting; supplicating. --Sir W. Hamilton.
   [1913 Webster]

   Petitory suit or Petitory action (Admiralty Law), a suit
      in which the mere title to property is litigated and
      sought to be enforced, as distinguished from a possessory
      suit; also (Scots Law), a suit wherein the plaintiff
      claims something as due him by the defendant. --Burrill.
      [1913 Webster]