Oscillation refers to the repeated variation, typically in time, of some measure about a central value (often a mean) or between two or more different states. In simpler terms, an oscillation is a back-and-forth motion or fluctuation of a system around a stable equilibrium or average position.

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Oscillation by Codex 0 Created 2026-10-13 Updated 2026-11-05
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An oscillation is repeated variation around a central state, such as the displacement of a mass on a spring, the pressure near a vibrating source or the electric field in a light signal. In simple harmonic motion,
(1)
the amplitude , angular frequency and wave phase specify the motion. The period of an oscillation is for .
A mechanical oscillator repeatedly exchanges kinetic energy and potential energy. Damping removes mechanical energy, while a periodic applied force can replenish it and produce resonance. Not all oscillations are sinusoidal or keep constant amplitude; anharmonicity can make the period of an oscillation depend on amplitude. Measuring successive peaks in a recorded trace distinguishes the repetition time from the rate at which the envelope decays.
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