[1] : The Collaborative International Dictionary of English v.0.48

buy \buy\, v. i.
   to negotiate or treat about a purchase.
   1913 webster

         i will buy with you, sell with you.      --shak.
   1913 webster

[2] : The Collaborative International Dictionary of English v.0.48

buy \buy\ bimac, v. t. imp.  p. p. bought baddt; p.
   pr.  vb. n. buying bimac"i^ng. oe. buggen, buggen,
   bien, as. bycgan, akin to os. buggean, goth. bugjan.
   1. to acquire the ownership of property by giving an
      accepted price or consideration therefor, or by agreeing
      to do so; to acquire by the payment of a price or value;
      to purchase; -- opposed to sell.
      1913 webster

            buy what thou hast no need of, and ere long thou
            wilt sell thy necessaries.            --b. franklin.
      1913 webster

   2. to acquire or procure by something given or done in
      exchange, literally or figuratively; to get, at a cost or
      sacrifice; to buy pleasure with pain.
      1913 webster

            buy the truth and sell it not; also wisdom, and
            instruction, and understanding.       --prov. xxiii.
                                                  23.
      1913 webster

   to buy again. see againbuy. obs. --chaucer.

   to buy off.
      a to influence to compliance; to cause to bend or yield
          by some consideration; as, to buy off conscience.
      b to detach by a consideration given; as, to buy off one
          from a party.

   to buy out
      a to buy off, or detach from. --shak.
      b to purchase the share or shares of in a stock, fund,
          or partnership, by which the seller is separated from
          the company, and the purchaser takes his place; as, a
          buys out b.
      c to purchase the entire stock in trade and the good
          will of a business.

   to buy in, to purchase stock in any fund or partnership.

   to buy on credit, to purchase, on a promise, in fact or in
      law, to make payment at a future day.

   to buy the refusal of anything, to give a consideration
      for the right of purchasing, at a fixed price, at a future
      time.
      1913 webster
see also:
bought buying to buy again againbuy to buy off to buy out 
to buy in to buy on credit to buy the refusal 

[3] : WordNet (r) 2.0

buy
     n : an advantageous purchase; "she got a bargain at the
         auction"; "the stock was a real buy at that price" syn:
         bargain, steal
     v 1: obtain by purchase; acquire by means of a financial
          transaction; "the family purchased a new car"; "the
          conglomerate acquired a new company"; "she buys for the
          big department store" syn: purchase ant: sell
     2: make illegal payments to in exchange for favors or
        influence; "this judge can be bought" syn: bribe, corrupt,
         grease one's palms
     3: acquire by trade or sacrifice or exchange; "she wanted to
        buy his love with her dedication to him and his work"
     4: accept as true; "i can't buy this story"
     5: be worth or be capable of buying; "this sum will buy you a
        ride on the train"
     also: bought
see also:
bargain steal purchase sell bribe corrupt 
grease one's palms bought 

[4] : Moby Thesaurus II by Grady Ward, 1.0

109 moby thesaurus words for "buy":
   abide by, accede, accept, accept for gospel, accept implicitly,
   acclaim, acquiesce, acquiesce in, acquire, advantageous purchase,
   agree, agree to, agree with, applaud, approach, assent, bargain,
   be certain, believe, believe without reservation, bribe, buy back,
   buy in, buy into, buy off, buy on credit, buy up, buying,
   buying power, buying up, catalog buying, cheer, coemption,
   complete a purchase, comply, consent, consumer power,
   consumer sovereignty, consumerism, corner, cornering, corrupt,
   credit, emption, engross, fix, get, get at, get to, give faith to,
   give the nod, good buy, good pennyworth, grease, grease the palm,
   hail, have, hire purchase, hold with, impulse buying, in toto,
   installment buying, lubricate, mail-order buying, make a buy,
   marketing, money illusion, monopolize, nod, nod assent, obtain,
   pay off, pennyworth, procure, purchase, purchasing,
   purchasing power, put faith in, reach, rebuy, rebuying, receive,
   redeem, regrate, repurchase, set store by, shopping,
   shopping spree, sop, square, steal, suborn, subscribe to, swallow,
   take, take care of, take for granted, take kindly to,
   take on faith, take on trust, take stock in, tamper with,
   tickle the palm, trust, vote for, welcome, window-shopping, yes,
   yield assent

Buy >> B Words
Buy, definition of term: Buy
buy_pag1.html

Buy Out >> B Words
Buy Out, definition of term: Buy Out
buy+out_pag1.html

Buy Into >> B Words
Buy Into, definition of term: Buy Into
buy+into_pag1.html

Buy In >> B Words
Buy In, definition of term: Buy In
buy+in_pag1.html

Buy The Farm >> B Words
Buy The Farm, definition of term: Buy The Farm
buy+the+farm_pag1.html