(physics) an ideal space in which the coordinate dimensions represent the variables that are required to describe a system or substance WordNet 3.0 & Open English WordNet

In dynamical systems theory and control theory, a phase space or state space is a space in which all possible "states" of a dynamical system or a control system are represented, with each possible state corresponding to one unique point in the phase space. Wikipedia

A mathematical space in which each possible state of a physical system is represented by a point — this equilibrium point is also referred to as a "microscopic state" Wikipedia Disambiguation

Concept in physics, frequently applied in thermodynamics, statistical mechanics, dynamical systems, symplectic manifolds and chaos theory. Wikipedia Disambiguation

Abstract space whose coordinates are the dynamic variables of the studied system Wikidata

The topological space in which each point represents a possible state of a system. Wiktionary

Space of states of a system. Wiktionary (translation)