Oscillation
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A weight on a spring will cause oscillation.
Oscillation is the repetitive change, typically in time, of some measure about a central value (often a point of equilibrium) or between two or more different states. Familiar examples include a swinging pendulum and alternating current power. The term vibration is sometimes used more narrowly to mean a mechanical oscillation but sometimes is used to mean the same thing as "oscillation". Oscillations happen not only in physical systems, but also in biological systems and in human society.
