Longman Dictionary of Contemporary English homepage

Date: 1500-1600
Language: Late Latin
Origin: energia, from Greek energeia 'activity', from ergon 'work'

energy

 noun
     
Related topics: Power
en‧er‧gy S1 W1 plural energies [uncountable and countable]
1 the physical and mental strength that makes you able to do things:
Helping people takes time and energy.
Boy, where do those kids get their energy?
She was full of energy after her vacation.
a waste of energy
have the energy to do something
I don't have the energy to deal with it right now.
Try to put more energy into your defensive game.
nervous energy (=too much energy that you have when you are nervous)
2TP power that is used to provide heat, operate machines etc
the world's energy resources
energy consumption
3 a special power that some people believe exists in their bodies and in some buildings:
There was a lot of energy in the room this morning - did you feel it?
4 technical in physics, the ability that something has to work or move:
kinetic energy
5

somebody's energies

the effort and interest that you use to do things
apply/devote/channel your energies into/to something
She's devoting all her energies to the wedding plans.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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