Definitions from Wiktionary (actuator)

▸ noun:  Something that actuates something else.
▸ noun:  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.
▸ noun:  (computer hardware) The mechanism that moves the head assembly on a disk drive.
▸ noun:  (electrical) A relay that controls the flow of electricity.
▸ Also see actuator





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