actuator

[ ak-choo-ey-ter ]
/ ˈæk tʃuˌeɪ tər /
|

noun

a person or thing that actuates.
a servomechanism that supplies and transmits a measured amount of energy for the operation of another mechanism or system.

Origin of actuator

First recorded in 1860–65; actuate + -or2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for actuator