What legal term denotes that all terms of a contract have been fulfilled by both parties?

The term that best indicates that all terms of a contract have been fulfilled by both parties is "performance." In legal contexts, performance refers specifically to the completion of the obligations and duties stipulated in a contract. When both parties have satisfactorily executed their parts of the agreement, performance is deemed to have occurred, and as a result, the contract is considered fulfilled.

The other terms do not capture this idea as accurately. "Amendment" refers to a change or alteration made to a contract, which does not imply that the original contract has been fully executed. "Execution" typically refers to the signing or formal execution of a contract rather than its fulfillment. "Compliance" generally indicates adherence to the terms or regulations, which may not necessarily imply that all specific obligations of the contract have been completely fulfilled by both parties. Thus, "performance" is the most precise term for the state where all contractual obligations have been satisfied.