ˈ ̷ ̷(ˌ)vō, ˈ ̷ ̷_və+ˌ- noun
Etymology: French servo-moteur, from Latin servus slave, servant + French moteur motor, from Latin motor one that moves — more at serve , motor
: a power-driven mechanism that supplements a primary control operated by a comparatively feeble force (as in a servomechanism)