The Collaborative International Dictionary of English v.0.48:

Bargain \Bar"gain\, v. t. [imp. & p. p. Bargained (?); p. pr.
   & vb. n. Bargaining.]
   To transfer for a consideration; to barter; to trade; as, to
   bargain one horse for another.
   [1913 Webster]

   To bargain away, to dispose of in a bargain; -- usually
      with a sense of loss or disadvantage; as, to bargain away
      one's birthright. "The heir . . . had somehow bargained
      away the estate." --G. Eliot.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bargaining
    n 1: the negotiation of the terms of a transaction or agreement

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "bargaining":
   audience, bargaining session, chaffer, chaffering,
   collective bargaining, coming to terms, conclave, confab,
   confabulation, conference, confrontation, congress, consultation,
   convention, council, council fire, council of war, dickering,
   discussion, exchange of views, eyeball-to-eyeball encounter,
   haggle, haggling, higgling, high-level talk, huddle,
   interchange of views, interview, meeting, negotiation,
   negotiations, news conference, package bargaining, palaver, parley,
   pattern bargaining, pourparler, powwow, press conference, seance,
   session, sitting, summit, summit conference, summitry