actuator

[ak-choo-ey-ter]
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:
1860–65; actuate + -or2

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
actuate (ˈæktʃʊˌeɪt)
 
vb
1.  to put into action or mechanical motion
2.  to motivate or incite into action: actuated by unworthy desires
 
[C16: from Medieval Latin actuātus, from actuāre to incite to action, from Latin āctusact]
 
actu'ation
 
n
 
'actuator
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The transmission maps actuator movements to the desired wing motions.
As might be expected, the discussion about dual actuator failures grew complicated.
Immersion believes this can be greatly improved by switching to a piezoelectric actuator.
An actuator is a mechanical device for moving or controlling a mechanism or system.
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