(relating to) a sentence, often starting with "if" or "unless", in which one half expresses something which depends on the other half

a conditional clause 条件从句

"If I won a lot of money, I'd travel the world" is an example of a conditional (sentence). If I won a lot of money, I'd go travelling 是条件句的一个例子。

(a form of a verb) expressing the idea that one thing depends on another thing

In English, the conditional is expressed by "would". 英语中，条件式用 would 来表示。

A conditional offer or agreement depends on something else being done.

The offer of a place on the nursing course is conditional on/upon my passing all three exams. 能否参加护理课程的学习要看我能否通过所有3门考试。