Meaning of ENERGY in English

ENERGY

■ noun ( plural energies )

1》 the strength and vitality required for sustained activity.

↘( energies ) a person's physical and mental powers as applied to a particular activity.

2》 power derived from physical or chemical resources to provide light and heat or to work machines.

3》 Physics the property of matter and radiation which is manifest as a capacity to perform work.

Origin

C16: from Fr. énergie , or via late L. from Gk energeia , from en- 'in, within' + ergon 'work'.

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.