The robustness of a given outcome to small changes in initial conditions or small random fluctuations. Chaos is an example of a process which is not stable.
Stability
See also
Stability MatrixExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Stability." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Stability.html