servo

This term is a clipped form of servomechanism, used primarily in engineering, robotics, and aviation. It carries a connotation of precision and closed-loop control, distinguishing it from simple motors that lack feedback mechanisms to verify their final position.

In technical discourse, the word is used both to describe the entire system and the specific hardware component. While it functions as a standard countable noun, it often appears in compound modifiers like servo motor or servo loop, where it describes the functional nature of the device.