controller

[kuhn-troh-ler]
noun
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. 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 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

controllership, noun
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World English Dictionary
controller (kənˈtrəʊlə)
 
n
1.  a person who directs, regulates, or restrains
2.  Also called: comptroller a business executive or government officer who is responsible for financial planning, control, etc
3.  the equipment concerned with controlling the operation of an electrical device
 
con'trollership
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

controller
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.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for controllers
Sega bundled controllers that looked like maracas with samba de amigo.
They are increasingly present in portable electronic devices and video game controllers.
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