add. ·noun any electric device for controlling a circuit or system;.
2. controller ·noun an officer appointed to keep a counter register of accounts, or to examine, rectify, or verify accounts.
3. controller ·noun one who, or that which, controls or restraines; one who has power or authority to regulate or control; one who governs.
4. controller ·add. ·noun 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.
5. controller ·add. ·noun 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.
6. controller ·add. ·noun 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.
7. controller ·noun 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.