Source : Webster's Revised Unabridged Dictionary (1913)

Treaty \Trea"ty\, n.; pl. {Treaties}. [OE. tretee, F. trait['e],
   LL. tractatus; cf. L. tractatus a handling, treatment,
   consultation, tractate. See {Treat}, and cf. {Tractate}.]
   1. The act of treating for the adjustment of differences, as
      for forming an agreement; negotiation. ``By sly and wise
      treaty.'' --Chaucer.

            He cast by treaty and by trains Her to persuade.
                                                  --Spenser.

   2. An agreement so made; specifically, an agreement, league,
      or contract between two or more nations or sovereigns,
      formally signed by commissioners properly authorized, and
      solemnly ratified by the several sovereigns, or the
      supreme power of each state; an agreement between two or
      more independent states; as, a treaty of peace; a treaty
      of alliance.

   3. A proposal tending to an agreement. [Obs.] --Shak.

   4. A treatise; a tract. [Obs.] --Sir T. Browne.

Source : WordNet®

treaty
     n : a written agreement between two states or sovereigns [syn: {pact},
          {accord}]