Question

How do you define wave-motion?

Answer 1

1. Wave is a disturbance created in a medium. Example: A ripple created in water when a stone is thrown in it.
2. Wave motion is the carrying forward of the disturbance in the medium.

Thus, Wave motion is the disturbance that travels in the medium, with the periodic repeated motion of the particles of medium. Here the motion is passed on from one particle to another.