energy level

noun
1.
a comparative level of capacity for vigorous activity: The child has a high energy level.
2.
Also called energy state. Physics. one of a quantized series of states in which matter may exist, each having constant energy and separated from others in the series by finite quantities of energy.

Origin:
1905–10

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
energy level
 
n
1.  a constant value of energy in the distribution of energies among a number of atomic particles
2.  the energy of a quantum state of a system. The terms energy level and energy state are often used loosely to mean quantum state. This is avoided in precise communication

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
energy level  
One of a set of states of a physical system associated with a range of energies. Electrons in an atom, for example, can shift between the different energy levels corresponding to orbitals in different shells. Also called energy state.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

energy level

in physics, any discrete value from a set of values of total energy for a subatomic particle confined by a force to a limited space or for a system of such particles, such as an atom or a nucleus. A particular hydrogen atom, for example, may exist in any of several configurations, each having a different energy. These energy states, in their essentials, remain fixed and are referred to as stationary states.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
When voltage is applied, the polymer's electrons are raised to a higher energy
  level.
The light excites the electrons to a higher energy level.
It generally does not interact with matter due to its low energy level, but it
  does interact a small amount with photons.
My energy level came back, my blood pressure returned to normal, and my
  cholesterol levels plummeted.
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