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1. The energy characteristic of a stationary state of a physical system, especially a quantum mechanical system.
2. The stationary state of a quantum mechanical system. In both senses also called energy state.
1. (General Physics) a constant value of energy in the distribution of energies among a number of atomic particles
2. (General Physics) 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
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.Also called en′ergy state`.
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|Noun||1.||energy level - a definite stable energy that a physical system can have; used especially of the state of electrons in atoms or molecules; "according to quantum theory only certain energy levels are possible"|