An example of energy is a person being able to run five miles just after waking up.
An example of energy is what is created by a wind turbine.
Who has the energy to climb that trail?
Origin of energy
From American Heritage Dictionary of the English Language, 5th Edition
- From Middle French énergie, from Late Latin energia, from Ancient Greek ἐνέργεια (energeia, “action, act, work”), from ἐνεργός (energos, “active”), from ἐν (en, “in”) + ἔργον (ergon, “work”).