Meaning of ENERGY in English

ENERGY

/ ˈenədʒi; NAmE -ərdʒi/ noun

1.

[ U ] the ability to put effort and enthusiasm into an activity, work, etc. :

It's a waste of time and energy.

She's always full of energy .

nervous energy (= energy produced by feeling nervous)

2.

energies [ pl. ] the physical and mental effort that you use to do sth :

She put all her energies into her work.

creative / destructive energies

3.

[ U ] a source of power, such as fuel, used for driving machines, providing heat, etc. :

solar / nuclear energy

It is important to conserve energy.

an energy crisis (= for example when fuel is not freely available)

4.

[ U ] ( physics ) the ability of matter or radiation to work because of its mass, movement, electric charge, etc. :

kinetic / potential, etc. energy

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WORD ORIGIN

mid 16th cent. (denoting force or vigour of expression): from French énergie , or via late Latin from Greek energeia , from en- in, within + ergon work.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.