to supervise, inspect, or keep a close watch on; to be in charge of

a place where criminals are kept; jail; a cell

to take into custody or keep someone behind bars

(bound form) a name for certain government offices or supervisory departments in imperial China

(bound form) an official in charge of supervision or affairs in ancient China

(literary) to look in a mirror; to use as a reference or warning from the past; same as 鉴 jiàn

a Chinese surname

(bound form) a palace eunuch, as in 太监 tài​jiàn