Stability
Also: closed-loop stability
The property that bounded disturbances or initial errors do not make behavior diverge uncontrollably.
Definitions include asymptotic, Lyapunov, and bounded-input bounded-output stability; each requires a specified model and operating region.
Example A stable position loop returns near equilibrium after a small disturbance.
Common misconception A response that eventually stops in one test does not establish stability for all gains and conditions.