actuator

Etymology

noun

  1. Something that actuates something else.
    The mind is the actuator of the body.
  2. A usually electric device that causes a mechanical device (i.e., a mechanism) to be switched on or off. For example; an electric motor that opens and closes a valve.
  3. (computer hardware) The mechanism that moves the head assembly on a disk drive.
  4. (electrical) A relay that controls the flow of electricity.

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