[] () an agreement in which only one side (person or company) promises to do sth or promises to do sth only if sb does a particular thing 片面义务契约；单方合同；单方承担义务合同◆An example of a unilateral contract is where you promise to pay a reward for somebody finding something. 单方合同的一个例子是承诺对找到某物的人给予奖励。➡bilateral contract