Oscillation

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An undamped spring–mass seestem is an oscillatory seestem.

Oscillation is the repetitive variation, typically in time, o some measur aboot a central value (eften a pynt o equilibrium) or atween twa or mair different states. Familiar examples include a swingin pendulum an AC pouer. The term vibration is sometimes uised mair narrowly tae mean a mechanical oscillation but is sometimes uised as a synonym o "oscillation". Oscillations occur nae anly in mechanical seestems but an aa in biological seestems, frae human society tae the brain.