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##### Wiktionary
partial differential equation

alt. (context calculus English) A differential equation that involves the partial derivatives of a function of several variables. n. (context calculus English) A differential equation that involves the partial derivatives of a function of several variables.

##### WordNet
partial differential equation

n. a differential equation involving a functions of more than one variable

##### Wikipedia
Partial differential equation

In mathematics, a partial differential equation (PDE) is a differential equation that contains unknown multivariable functions and their partial derivatives. (A special case are ordinary differential equations (ODEs), which deal with functions of a single variable and their derivatives.) PDEs are used to formulate problems involving functions of several variables, and are either solved by hand, or used to create a relevant computer model.

PDEs can be used to describe a wide variety of phenomena such as sound, heat, electrostatics, electrodynamics, fluid flow, elasticity, or quantum mechanics. These seemingly distinct physical phenomena can be formalised similarly in terms of PDEs. Just as ordinary differential equations often model one-dimensional dynamical systems, partial differential equations often model multidimensional systems. PDEs find their generalisation in stochastic partial differential equations.