adjective. Of, relating to, or having the nature of a contract.

Arising from a contract or agreement; consisting in or of the nature of a contract: as, a contractual liability.

adjective. Of or pertaining to a contract

adjective. relating to or part of a binding legal agreement

"Mr. Levin's early research was on the nature of long-term contractual relationships, such as those between employees and employers."

contractual obligation  contractual right  contractually  

factual  

authority  common law  conjugal  constitutional  court-ordered