controller

[kuh n-troh-ler]

noun

an employee, often an officer, of a business firm who checks expenditures, finances, etc.; comptroller.
a person who regulates, directs, or restrains.
British Aeronautics. a dispatcher.
a regulating mechanism; governor.
Also called control unit, processor. Computers. the key component of a device, as a terminal, printer, or external storage unit, that contains the circuitry necessary to interpret and execute instructions fed into the device.
a remote piece of hardware used to direct or control an electronic device: a video-game controller.

Origin of controller

1350–1400; Middle English countrollour < Anglo-French countrero(u)llour, Middle French contrerolleur, equivalent to contrerolle duplicate roll (see control) + -eur, -our < Latin -ōr- -or2 or -ātōr- -ator
Related formscon·trol·ler·ship, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019


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British Dictionary definitions for controller

controller

noun

a person who directs, regulates, or restrains
Also called: comptroller a business executive or government officer who is responsible for financial planning, control, etc
the equipment concerned with controlling the operation of an electrical device
Derived Formscontrollership, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for controller
n.

late 14c., from Anglo-French contrerolleour (late 13c.), Old French contrerelleor (Modern French contrôleur), from Medieval Latin contrarotulator, agent noun from *contra-rotulare (see control (v.)). Mechanical sense is from 1867.

Online Etymology Dictionary, © 2010 Douglas Harper