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The Collaborative International Dictionary of English v.0.48 (gcide)

Controller \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.
[1913 Webster]

The great controller of our fate
Deigned to be man, and lived in low estate.
--Dryden.
[1913 Webster]

2. An officer appointed to keep a counter register of
accounts, or to examine, rectify, or verify accounts.
[More commonly written {controller}.]
[1913 Webster]

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.
[1913 Webster]

4. (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.
[Webster 1913 Suppl.]

5. (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.
[Webster 1913 Suppl.]