noun · the constant difference between any two consecutive terms in an arithmetic progression

在这个等差数列中，公差是五。

noun · the amount of variation or error allowed in the dimensions or properties of a manufactured part

这种精密零件的公差要求非常严格。

noun · a low-ranking official or runner in a yamen in pre-modern China

衙门派了几名公差前去执行搜查任务。

an official errand or business trip

他因为办公差，已经在北京待了三天。