The Collaborative International Dictionary of English v.0.48:

pact \pact\ (p[a^]kt), n. [L. pactum, fr. paciscere to make a
   bargain or contract, fr. pacere to settle, or agree upon; cf.
   pangere to fasten, Gr. phgny`nai, Skr. p[=a][,c]a bond, and
   E. fang: cf. F. pacte. Cf. Peace, Fadge, v.]
   An agreement; a league; a compact; a covenant. --Bacon.
   [1913 Webster]

         The engagement and pact of society which goes by the
         name of the constitution.                --Burke.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pact
    n 1: a written agreement between two states or sovereigns [syn:
         treaty, pact, accord]

Moby Thesaurus II by Grady Ward, 1.0:

37 Moby Thesaurus words for "pact":
   accord, agreement, alliance, arrangement, bargain,
   binding agreement, bond, cartel, collective agreement, compact,
   concord, concordat, consortium, contract, convention, covenant,
   covenant of salt, deal, dicker, employment contract, entente,
   formal agreement, ironclad agreement, legal agreement,
   legal contract, mutual agreement, paction, promise, protocol,
   settlement, stipulation, transaction, treaty, understanding,
   union contract, valid contract, wage contract



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PACT
       Partnership in Advanced Computing Technologies (org. UK)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PACT
       Personal Air Communications Technology, "pACT"


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

PACT
       Production Analyses Control Technique


Bouvier's Law Dictionary, Revised 6th Ed (1856):

PACT, civil law. An agreement made by two or more persons on the same
subject in order to form some engagement, or to dissolve or modify, one
already made, conventio est duorum in idem placitum consensus de re
solvenda, id. est facienda vel praestanda. Dig. 2, 14; Clef des Lois Rom.
h.t.; Ayl. Pand. 558; Merl, Rep. Pacte, h.t.