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 peripheral device, as a terminal, printer, or external storage unit, that contains the circuitry necessary to interpret and execute instructions fed into the device.

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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
controller (kənˈtrəʊlə)
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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

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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Computing Dictionary

controller definition

Part of a computer, typically a separate circuit board, which allows the computer to use certain kinds of peripheral devices. A disk controller is used to connect hard disks and floppy disks, a network controller is used for Ethernet. Other controllers are: keyboard controller, interrupt controller and graphics controller.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Adjust your irrigation controller to fit your climate conditions and
But if he's moody and impulsive, tell him to step away from the controller.
If you're planning to install an irrigation system or replace an old
  controller, check out your options.
The best way to water vegetables in containers is with drip irrigation operated
  by an automatic controller.
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