(1):

(n.) One given to fault-finding; a censurer.

(2):

(n.) One who is empowered to examine manuscripts before they are committed to the press, and to forbid their publication if they contain anything obnoxious; - an official in some European countries.

(3):

(n.) A critic; a reviewer.

(4):

(n.) One of two magistrates of Rome who took a register of the number and property of citizens, and who also exercised the office of inspector of morals and conduct.