phase space

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A multidimensional representation of a dynamical system in which each dimension corresponds to one variable of the system. Thus, a point of phase space corresponds to a specific state of the system, and a path represents the evolution of the system through different states.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun mathematics, physics The topological space in which each point represents a possible state of a system.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun (physics) an ideal space in which the coordinate dimensions represent the variables that are required to describe a system or substance