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actuator

[ak-choo-ey-ter] /ˈæk tʃuˌeɪ tər/
noun
1.
a person or thing that actuates.
2.
a servomechanism that supplies and transmits a measured amount of energy for the operation of another mechanism or system.
Origin of actuator
1860-1865
1860-65; actuate + -or2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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