Metastability

Intermediate energetic state within a dynamical system

In chemistry and physics, metastability is an intermediate energetic state within a dynamical system other than the system's state of least energy. A ball resting in a hollow on a slope is a simple example of metastability. If the ball is only slightly pushed, it will settle back into its hollow, but a stronger push may start the ball rolling down the slope.

From Wikipedia, under CC BY-SA. More on occurri.