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