1. To move to and fro, or from side to side, as a pendulum, an elastic rod, or a stretched string, when disturbed from its position of rest; to swing; to oscillate.
2. To have the constituent particles move to and fro, with alternate compression and dilation of parts, as the air, or any elastic body; to quiver.
3. To produce an oscillating or quivering effect of sound; as, a whisper vibrates on the ear.
4. To pass from one state to another; to waver; to fluctuate; as, a man vibrates between two opinions.