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

- Example: "a multidimensional phase space"

WordNet (r) 3.0 (2006):

phase space n 1: (physics) an ideal space in which the coordinate dimensions represent the variables that are required to describe a system or substance; "a multidimensional phase space"The Free On-line Dictionary of Computing (30 December 2018):

phase spaceThe 2n-dimensional space consisting of the possible values of (x1, x1., x2, x2., ..., xn, xn.) for a system of n first-order ordinary differential equations (or more generally, Pfaffian forms). If n=1, the phase space is known as a phase plane. (http://mathworld.wolfram.com/PhaseSpace.html). (2008-05-02)