measure word, noun, punctuation · classifier for terms served in office, or for spouses and partners

他是我们学校的第二任校长。

verb, place name · to assign, appoint, or take up a post, office, or responsibility

他在该市任市长多年，口碑极佳。

conjunction, pronoun · no matter how, what, or who; regardless of

任你怎么解释，我也不想再听了。

proper name · surname Ren

任先生是我们的新经理。

verb · to let, allow, or give free rein to

这三种方案你可以任选其一。