Oscillation is the repetitive variation, 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 AC power. The term vibration
is sometimes used more narrowly to mean a mechanical oscillation but is
sometimes used as a synonym of "oscillation". Oscillations occur not
only in physical systems but also in biological systems, from human society to the brain.Oscillation
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