1. a person or thing that directs or regulates something: "the Controller of BBC Television Programmes"
▪ a person in charge of an organization's finances:"the regional controller for the Department of Education"
Word OriginMiddle English (denoting a person who kept a duplicate register of accounts): from Anglo-Norman contrerollour, from contreroller ‘keep a copy of a roll of accounts’ (see control). Compare with comptroller.