01 n. One who, or that which, controls or restraines; one who has power or authority to regulate or control; one who governs.
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1.
One who, or that which, controls or restraines; one who has power or authority to regulate or control; one who governs.“The great controller of our fate Deigned to be man, and lived in low estate.” — Dryden.
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2.
An officer appointed to keep a counter register of accounts, or to examine, rectify, or verify accounts.
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3.
An iron block, usually bolted to a ship's deck, for controlling the running out of a chain cable. The links of the cable tend to drop into hollows in the block, and thus hold fast until disengaged.(Naut.)
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4.
Any electric device for controlling a circuit or system;(Elec.)
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5.
A lever controlling the speed of an engine; -- applied esp. to the lever governing a throttle valve, as of a steam or gasoline engine, esp. on an automobile.(Mach.)