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.Computers.the key component of a peripheral device, as a terminal, printer, or external storage unit, that contains the circuitry necessary to interpret and execute instructions fed into the device.
Origin: 1350–1400;Middle Englishcountrollour < Anglo-Frenchcountrero(u)llour,Middle Frenchcontrerolleur, equivalent to contrerolle duplicate roll (see control) + -eur, -our < Latin-ōr--or2 or -ātōr--ator
mid-15c., from Anglo-Fr. contrerolleour (late 13c.), O.Fr. contrerelleor, from M.L. contrarotulator, agent noun from *contra-rotulare (see control). Mechanical sense is from 1867.