controller

noun9

1. •
   One who controls something.

   • The great controller of our fate / Deigned to be man, and lived in low estate. — 1700
2. •
   The person who supervises and handles communication with an agent in the field.
3. •
   Any electric or mechanical device for controlling a circuit or system.

   • Nothing more can be squeezed out of the motive power unit once the master controller has been moved to full on. — 1963
4. •
   A mechanism that controls or regulates the operation of a machine, especially a peripheral device in a computer.
5. •
   A hardware device designed to allow the user to play video games.

   • I'm collecting player's names for a school project. You know, players just like you! That's right, you--the one holding the controller. Would you register your name, please? — 1995
6. •
   The chief accounting officer which audits, and manages the financial affairs of a company or government; a comptroller.
7. •
   In software applications using the model-view-controller design pattern, the part or parts of the application that treat input and output, forming an interface between models and views.
8. •
   The subject of a control verb. See Control (linguistics)
9. •
   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.