energy level

Noun
  1. A definite stable energy that a physical system can have;
    Used especially of the state of electrons in atoms or molecules (synset 111473167)
    "according to quantum theory only certain energy levels are possible"
    is a type of: energy, free energy - (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs
    same as: energy state

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