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From Middle English countreroller, from Anglo-Norman countrerolleour, from Old French contrerelleor (French contrôleur), from Medieval Latin contrārotulātor, from *contrārotulāre (from which control). Equivalent to control +‎ -er.


controller (plural controllers)

  1. One who controls something.
    • (Can we date this quote?) Dryden
      The great controller of our fate / Deigned to be man, and lived in low estate.
  2. A person who audits, and manages the financial affairs of a company or government; a comptroller.
  3. A mechanism that controls or regulates the operation of a machine, especially a peripheral device in a computer.
  4. (nautical) 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.


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