Source : Webster's Revised Unabridged Dictionary (1913)

Pact \Pact\, n. [L. pactum, fr. paciscere to make a bargain or
   contract, fr. pacere to settle, or agree upon; cf. pangere to
   fasten, Gr. ?, Skr. p[=a]ca bond, and E. fang: cf. F. pacie.
   Cf. {Peace}, {Fadge}, v.]
   An agreement; a league; a compact; a covenant. --Bacon.

         The engagement and pact of society whish goes by the
         name of the constitution.                --Burke.

Source : WordNet®

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