energy level

American  

[en-er-jee lev-uhl] / ˈɛn ər dʒi ˌlɛv əl /

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.

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energy level British  

noun

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

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Etymology

Origin of energy level

First recorded in 1905–10

Example Sentences

The Fermi level represents the highest energy level electrons can occupy in a solid at absolute zero.

From Science Daily • Dec. 21, 2025

Herbert’s return has brought a noticeable shift in mood, the lift in energy level nearly tangible.

From Los Angeles Times • Aug. 20, 2024

“It will definitely ramp up the energy level for Trump supporters,” he said.

From Slate • Jul. 16, 2024

Especially when players keep suggesting the effort and energy level has gone absent too many nights.

From Seattle Times • Apr. 16, 2024

All of the factors—disposition, energy level, intelligence, and interests—had to correspond and to interact perfectly.

From "The Giver" by Lois Lowry