phase space

noun Physics.
a hypothetical space constructed so as to have as many coordinates as are necessary to define the state of a given substance or system.

1925–30 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Computing Dictionary

phase space definition

The 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.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
In phase space, all that is known about the state of a dynamical system at a
  single moment can be collapsed to a point.
Each potential state of that particle's system corresponds to one unique point
  in a phase space.
Frank and his colleagues work with the geometry of something called phase space.
The temperature of will then increase and the phase space volume of that body's
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