The Collaborative International Dictionary of English v.0.48:

Negotiation \Ne*go`ti*a"tion\, n. [L. negotiatio: cf. F.
   n['e]gociation.]
   1. The act or process of negotiating; a treating with another
      respecting sale or purchase. etc.
      [1913 Webster]

   2. Hence, mercantile business; trading. [Obs.]
      [1913 Webster]

            Who had lost, with these prizes, forty thousand
            pounds, after twenty years' negotiation in the East
            Indies.                               --Evelyn.
      [1913 Webster]

   3. The transaction of business between nations; the mutual
      intercourse of governments by diplomatic agents, in making
      treaties, composing difference, etc.; as, the negotiations
      at Ghent.
      [1913 Webster]

            An important negotiation with foreign powers.
                                                  --Macaulay.
      [1913 Webster]

WordNet (r) 3.0 (2006):

negotiation
    n 1: a discussion intended to produce an agreement; "the buyout
         negotiation lasted several days"; "they disagreed but kept
         an open dialogue"; "talks between Israelis and
         Palestinians" [syn: negotiation, dialogue, talks]
    2: the activity or business of negotiating an agreement; coming
       to terms