Meaning

noun someone who maintains and audits business accounts

noun a person who directs and restrains

noun a mechanism that controls the operation of a machine

originFrom Middle English countreroller, from Anglo-Norman contreroulour and Middle French contreroleur (French contrôleur), from Medieval Latin contrārotulātor, from *contrārotulāre (from which control). Doublet of comptroller. By surface analysis, control + -er.

Etymology from Wiktionary, CC BY-SA 3.0