What is Contract ?
Contract is (noun) a legal agreement I don’t agree with some of the conditions of the contract. under contract bound by the conditions of a contract The company is under contract to a French supermarket.(verb) 1. to make an official agreement to do some work to contract to supply spare parts or to contract for the supply of spare parts 2. to sign an agreement with a contractor The corporation has contracted the refuse collection service to a private company. 3. to become smaller Metal contracts when it gets cold, and expands when it is hot.
source: Easier English, Student Dictionary Upper Intermediate Level