precontracted
/priːˈkɒntraktɪd/adjective
Contracted beforehand; specifically (a) already bound by a promise or contract; (b) contracted, acquired, or formed in advance; (c) existing or agreed upon prior to a contract.
Origin
Early 17th century; earliest use found in Thomas Middleton (d. 1627), playwright. From pre- + contracted, after pre-contract, pre-contract.