quantum state

noun Physics.
the condition in which a physical system exists, usually described by a wave function or a set of quantum numbers.

Origin:
1920–25

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World English Dictionary
quantum state
 
n
physics See also energy level a state of a system characterized by a set of quantum numbers and represented by an eigenfunction. The energy of each state is precise within the limits imposed by the uncertainty principle but may be changed by applying a field of force. States that have the same energy are called degenerate

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American Heritage
Science Dictionary
quantum state  
A description in quantum mechanics of a physical system or part of a physical system. Different quantum states for a physical system show discrete differences in the value of the variables used to define the state. For example, the spin of an isolated electron can take on one of only two values; there are no other quantum states available for the electron and no intermediate values, since spin is quantized. The quantum state is sometimes described by a set of quantum numbers that pick out the appropriate values for describing the state.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The same is true of energy and time and also of the phase and amplitude of a
  quantum state.
They form when a cloud of atoms-sometimes millions or more-all enter the same
  quantum state and behave as one.
Faith is not so much a binary pole as a quantum state, which tends to
  indeterminacy when closely examined.
The human would see a dim point of light in either the right or left field of
  view, depending on the photon's quantum state.
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