vibrations
n. C / Un. small, fast movements that go back and forth or up and down. You can often feel them when a machine is running or when someone is playing loud music.
n. rapid, rhythmic oscillations of a solid, liquid, or gas about an equilibrium point. Often used in the plural to describe the physical sensation of sound or mechanical movement.
The phone's vibrations on the wooden table woke me up.
Engineers measured the vibrations in the bridge to ensure it could withstand the heavy traffic from the new highway.
Sensitive laboratory equipment must be shielded from the subtle vibrations caused by passing trains to maintain the accuracy of the microscopic measurements.
Commonly used in the plural when referring to the physical sensation or the waves produced by sound.