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energy
Text:
1
active strength of body or mind <for a woman of advanced years, she has remarkable energy> — see vigor 1
2
something with a usable capacity for doing work <some of the power needs of the house are provided by solar energy> — see fuel
3
the ability to exert effort for the accomplishment of a task <I'm so tired that I don't think I have the energy to take another step> — see power 2
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