Controller word meaning and definition

[noun] a mechanism that controls the operation of a machine; "the speed control on his turntable was not working properly"; "I turned the controls over to her"
[noun] someone who maintains and audits business accounts
[noun] a person who directs and restrains

\Con*trol"ler\, n. [From control, v. t.: cf. F. contr[^o]leur.] 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. 2. An officer appointed to keep a counter register of accounts, or to examine, rectify, or verify accounts. [More commonly written {controller}.] 3. (Naut.) 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.
\Con*trol"ler\, n. 1. (Elec.) Any electric device for controlling a circuit or system; specif.:
(a) An electromagnet, excited by the main current, for throwing a regulator magnet into or out of circuit in an automatic device for constant current regulation.
(b) A kind of multiple switch for gradually admitting the current to, or shutting it off from, an electric motor; as, a car controller for an electric railway car. 2. (Mach.) 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.

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