"Bargain" is a word in LAW AND LEGAL, ENGLISH

A mutual undertaking, con-tract, or agreement

The thing stipulated or purchased; also, anything bought
cheap.

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.

An agreement or stipulation; mutual pledge.

To transfer for a consideration; to barter; to trade;
as, to bargain one horse for another.

A purchase; also ( when not qualified), a gainful
transaction; an advantageous purchase; as, to buy a thing at a bargain.

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.