Source : Webster's Revised Unabridged Dictionary (1913)

Uti possidetis \U`ti pos`si*de"tis\ [L., as you possess.]
   1. (Internat. Law) The basis or principle of a treaty which
      leaves belligerents mutually in possession of what they
      have acquired by their arms during the war. --Brande & C.

   2. (Roman Law) A species of interdict granted to one who was
      in possession of an immovable thing, in order that he
      might be declared the legal possessor. --Burrill.