In specific senses. Any of various police officials; in later use spec. (a) British a police officer ranking above chief inspector; (b) U.S. the…

(Now always written sergeant.) A police officer, of higher rank than a simple constable; in Great Britain ranking next below an inspector.

An officer of police ranking next below a superintendent and above a sergeant.

the sergeant in charge of a police station.

= station sergeant n. at station, n. compounds 2.

= sergeant, n. 9.

slang (originally U.S.). A police captain or sergeant; a police chief.

= superintendent, n.; esp. a police superintendent.