precedent

先例、前例

Letting one student skip the exam would set a dangerous precedent.

让一名学生免考会开下危险的先例。

判例、先例法律

The court's ruling became a binding precedent for similar cases.

法院的裁决成为类似案件必须遵循的判例。

前所未有、史无前例多用于 without precedent

A storm of this size is without precedent in the region.

这种规模的风暴在该地区前所未有。

在先的、先前的正式

The report ignores the precedent events that caused the crisis.

这份报告忽略了引发危机的先前事件。