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What does energy level mean?

Looking for the meaning or definition of the word energy level? Here's what it means.

Noun
  1. Used other than with a figurative or idiomatic meaning: see energy,‎ level.
  2. (physics) any of the discrete stable energies that a quantum mechanical system (such as the electrons of an atom) can have
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Examples
First up were alt-rockers Take the Day, a five-piece from Milwaukee who dialed up the energy level on their set.
Air pistols are limited by law to a kinetic energy level of six foot-pounds.
Have them wait 30 seconds or so, and then ask them to rate their energy level once again by marking the scale.
This higher energy level allows X-ray beams to pass straight through most of the soft material in the human body.
This means that an atom with eight electrons in its outermost energy level is very stable.
An electric field emanating from the charged red atom causes energy level shifts in the molecule, allowing current to flow.

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