en'ergy lev"el

1. a comparative level of capacity for vigorous activity: The child has a high energy level.
2. Also called en'ergy state". 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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

energy efficiency ratioEnergy Star Program
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