Definition of "actuator" in English

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. (electricity) A relay that controls the flow of electricity.