A rapid back-and-forth movement of something, or the feeling of something shaking slightly.
From Latin 'vibrare' meaning 'to shake or quiver,' possibly related to a root meaning 'to move quickly.' The word entered English in the 16th century as scientists began studying motion and physics.
Your phone's vibration is actually a tiny motor spinning an off-center weight at extreme speeds—the same principle engineers use to separate materials in factories and even to help astronauts clean off equipment in space!
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