noun
vibration
vie-BRAY-shun/vaɪˈbreɪʃn/
Repeated back-and-forth movement.
The plucked guitar string produces sound through its rapid vibration.

Etymology
The pieces name the action of setting something trembling. Early English use described a musical string moving rapidly to and fro—the same physical motion meant here.
In context
echo objective to learn the phenomenon of echo sound is propagated through a medium by a back and forth vibration of particles
More examples
- I feel the washing machine's vibrations through the floor.
- The phone's vibration alerts me to a new message.
- Rubber pads reduce vibration from the motor.
Forms
vibration · vibrations
vibrate verb — To move quickly back and forth.
Similar words
- oscillation
- Often describes a regular cycle between two positions or states.
- shaking
- Emphasizes noticeable movement that need not follow a regular cycle.