Which term describes an unequal exchange of value in a contract?

The term that describes an unequal exchange of value in a contract is outlined by the concept of "aleatory." Aleatory contracts are those where the performance of one or both parties is contingent upon an uncertain event, and the value exchanged does not have to be equal. This is common in insurance contracts, where the insurer's obligation to pay a claim is generally much larger than the premium the insured pays, reflecting the nature of risk and uncertainty.

In contrast, adequate consideration refers to a fair value exchange that typically occurs in standard contracts. Unilateral contracts involve a promise from one party in exchange for an act by another party, while conditional contracts specify certain conditions that must be met for the contract to be valid or enforceable. These terms do not capture the essence of an unequal exchange of value as aptly as aleatory does.