Definition of bargain:
(n) :
an agreement between parties concerning the sale of property; or a contract by which one party
binds himself to transfer the right to some property for a consideration, and the other party binds himself to receive the property and pay the consideration; an agreement or stipulation; mutual
pledge
"a contract is a bargain that is legally binding. --
w:Wharton."
(v) :
to make a bargain; to make a contract for the exchange of property or services; -- followed by with and for; as, to bargain with a farmer for a cow; to transfer for a consideration; to barter; to trade; as, to bargain one horse for another
"so worthless peasants bargain for their wives. --
w:Shak."