Source : Webster's Revised Unabridged Dictionary (1913)

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.

   {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.

Source : WordNet®

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