Wave
From ExoDictionary
Wave
A disturbance which is propagated in a medium in such a manner that at any point in the medium the quantity serving as measure of disturbance is a function of the time, while at any instant the displacement at a point is a function of the position of the point.
Any physical quantity that has 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.
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
