adj.契约的，合同的，按合同(或契约)规定的

The contract was signed by both parties in a formal contractual agreement.
这份合同在正式的合同协议中由双方签署。
He carefully read through the contractual terms before signing the lease.
在签署租赁协议之前，他仔细阅读了合同条款。
The company's main source of income comes from the long-term contractual agreements with suppliers.
公司的主要收入来源是与供应商的长期合同协议。
In a contractual dispute, the court ruled in favor of the plaintiff based on the terms of the agreement.
在一起合同纠纷中，法院根据协议条款判决原告胜诉。
The contractor is bound by the contractual obligations to complete the project on time.
承包商必须履行合同义务，按时完成项目。
The non-disclosure agreement (NDA) is a common contractual provision in many business deals.
非披露协议（NDA）是许多商业交易中的常见合同条款。
The contractual clause stating that the buyer has a right to return the product within 30 days is enforceable.
规定买家有权在30天内退货的合同条款具有法律效力。
The employer is contractually obligated to provide health insurance for their employees.
根据合同，雇主有义务为员工提供健康保险。
The contract was terminated early due to a breach of contractual obligations by one party.
因一方违反合同义务，合同被提前终止。
The contractual agreement specifies that both parties must give a written notice of termination three months prior.
合同规定，双方必须在终止前三个月书面通知对方。