Etymology
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servo

1910, from servo-motor (1889), from French servo-moteur (1873), ultimately from Latin servus "slave" (see serve (v.)) + motor "mover" (see motor (n.)).

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Definitions of servo
1
servo (n.)
control system that converts a small mechanical motion into one requiring much greater power; may include a negative feedback system;
Synonyms: servomechanism / servosystem
2
servo (adj.)
of or involving servomechanisms;
Synonyms: servomechanical
From wordnet.princeton.edu