wave

A disturbance which is propagated in a medium in such a manner that AT any point in the medium the quantity serving as the measure of the disturbance is a function of time, while at any instant the displacement at a point is a function of the position of the point. Any physical quantity having the SAME relationship to some independent variable (usually time) that a propagated disturbance has, at a particular instant, with respect to space, may be called a wave. An electromagnetic wave is one in which the disturbance is the change in the electric and magnetic field intensities from their equilibrium values in space.

Related Terms
shock wave,

External links for wave
wave on Wikipedia
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wave on The Free Dictionary

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