contractual

Short definition from Wiktionary

Adjective

1. 1
   Of, relating to, or enforced by a contract.

Noun

1. 1
   A contractualized employee; One who is hired as a temporary worker, especially one who is hired for a single project.
2. 2
   A charge for a service that is applied through a contract with another provider.
3. 3
   A contract specifying details of the relationship with another country or body