"wave equation." YourDictionary, n.d. Web. 15 December 2018. <https://www.yourdictionary.com/wave-equation>.
wave equation. (n.d.). Retrieved December 15th, 2018, from https://www.yourdictionary.com/wave-equation
A partial differential equation that describes the shape and movement of waves, given a set of boundary conditions (such as the initial shape of the wave, or the evolution of a force affecting the wave).