The Collaborative International Dictionary of English v.0.48:

Negotiate \Ne*go"ti*ate\, v. t. [imp. & p. p. Negotiated; p.
   pr. & vb. n. Negotiating.]
   1. To carry on negotiations concerning; to procure or arrange
      for by negotiation; as, to negotiate peace, or an
      exchange.
      [1913 Webster]

            Constantinople had negotiated in the isles of the
            Archipelago . . . the most indispensable supplies.
                                                  --Gibbon.
      [1913 Webster]

   2. To transfer for a valuable consideration under rules of
      commercial law; to sell; to pass.
      [1913 Webster]

            The notes were not negotiated to them in the usual
            course of business or trade.          --Kent.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Negotiate \Ne*go"ti*ate\, v. i. [L. negotiatus, p. p. of
   negotiari, fr. negotium business; nec not + otium leisure.
   Cf. Neglect.]
   1. To transact business; to carry on trade. [Obs.] --Hammond.
      [1913 Webster]

   2. To treat with another respecting purchase and sale or some
      business affair; to bargain or trade; as, to negotiate
      with a man for the purchase of goods or a farm.
      [1913 Webster]

   3. To hold intercourse respecting a treaty, league,
      convention, or other proposed agreement; to treat with,
      respecting peace or commerce; to conduct communications or
      conferences.
      [1913 Webster]

            He that negotiates between God and man
            Is God's ambassador.                  --Cowper.
      [1913 Webster]

   4. To intrigue; to scheme. [Obs.] --Bacon.
      [1913 Webster]

WordNet (r) 3.0 (2006):

negotiate
    v 1: discuss the terms of an arrangement; "They negotiated the
         sale of the house" [syn: negociate, negotiate, talk
         terms]
    2: succeed in passing through, around, or over; "The hiker
       negociated the high mountain pass" [syn: negotiate,
       negociate]

Moby Thesaurus II by Grady Ward, 1.0:

161 Moby Thesaurus words for "negotiate":
   abalienate, act between, adjust, advise with, agree, alien,
   alienate, amortize, arbitrate, arrange, assign, bargain, barter,
   beat down, bequeath, bid, bid for, bounce, bound, buck, buckjump,
   call in, capriole, cede, chaffer, cheapen, clear, clear the hurdle,
   collogue, come along, come on, compare notes, compose, concert,
   confer, confer with, consign, consult, consult with, contract,
   contrive, convey, counsel, covenant, curvet, cut the mustard, deed,
   deed over, deliberate, deliver, demise, devolve upon, dicker,
   discuss, discuss with, drive a bargain, enfeoff, engineer,
   exchange, exchange observations, exchange views, get along, get by,
   get on, give, give title to, go between, go on, hack it, haggle,
   hand, hand down, hand on, hand over, have conversations, higgle,
   hippety-hop, hold conference, hop, huckster, hurdle, intercede,
   intermediate, interpose, intervene, jew down, judge, jump,
   jump over, leap, leap over, leapfrog, make it, make out, make over,
   make terms, make the grade, manage, manage somehow, mediate,
   meet halfway, moderate, muddle through, outbid, over, overjump,
   overleap, overskip, palaver, parley, pass, pass on, pass over,
   pounce, pounce on, pounce upon, powwow, put heads together,
   put over, put through, reason with, refer to, referee, represent,
   scrape along, sell, settle, settle on, sign away, sign over,
   sit down together, sit down with, ski jump, skip, spring, start,
   start aside, start up, steeplechase, step in, succeed in, surmount,
   surrender, swing, swing the deal, take counsel, take up with,
   talk over, trade, transact, transfer, transmit, treat with,
   turn over, umpire, underbid, updive, upleap, upspring, vault,
   worry along