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Definition of comptroller. 1 : a royal-household official who examines and supervises expenditures. 2 : a public official who audits government accounts and sometimes certifies expenditures.
controller. 1  an employee, often an officer, of a business firm who checks expenditures, finances, etc.; comptroller. 2  a person who regulates, directs, or restrains. 3  British Aeronautics. a dispatcher. 4  a regulating mechanism; governor. 5  Also called control unit, processor.