con·tract noun \'kän-?trakt\ : a legal agreement between people, companies, etc.
: a document on which the words of a contract are written
: an agreement to kill a person for money
Full Definition of CONTRACT
1 a : a binding agreement between two or more persons or parties; especially : one legally enforceable b : a business arrangement for the supply of goods or services at a fixed price <make parts on contract> c : the act of marriage or an agreement to marry 2 : a document describing the terms of a contract 3 : the final bid to win a specified number of tricks in bridge 4 : an order or arrangement for a hired assassin to kill someone <his enemies put out a contract on him>