A repeated periodic motion, vibration or variation in the state of an object. The time for one oscillation is called the PERIOD. The number of oscillations in a given time (usually a second) is called the FREQUENCY (vibrations per second are given the unit of the HERTZ or Hz.).

Adjustable Plaything
Aeolian Harp

Oscillation - Electric
Oscillation - Coupled
Simple harmonic motion
Phase angle

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