servomechanism

noun
ser·​vo·​mech·​a·​nism | \ˈsər-vō-ˌme-kə-ˌni-zəm \

Definition of servomechanism 

: an automatic device for controlling large amounts of power by means of very small amounts of power and automatically correcting the performance of a mechanism

First Known Use of servomechanism

1926, in the meaning defined above

History and Etymology for servomechanism

servo- (as in servomotor) + mechanism

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The first known use of servomechanism was in 1926

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