[en-er-jee] 
| 1. | the capacity for vigorous activity; available power: I eat chocolate to get quick energy. |
| 2. | an adequate or abundant amount of such power: I seem to have no energy these days. |
| 3. | Often, energies. a feeling of tension caused or seeming to be caused by an excess of such power: to work off one's energies at tennis. |
| 4. | an exertion of such power: She plays tennis with great energy. |
| 5. | the habit of vigorous activity; vigor as a characteristic: Foreigners both admire and laugh at American energy. |
| 6. | the ability to act, lead others, effect, etc., forcefully. |
| 7. | forcefulness of expression: a writing style abounding with energy. |
| 8. | Physics. the capacity to do work; the property of a system that diminishes when the system does work on any other system, by an amount equal to the work so done; potential energy. Symbol: E |
| 9. | any source of usable power, as fossil fuel, electricity, or solar radiation. |
| en·er·gy (ěn'ər-jē) n. pl. en·er·gies
[French énergie, from Late Latin energīa, from Greek energeia, from energos, active : en-, in, at; see en-2 + ergon, work; see werg- in Indo-European roots.] |
In physics, the ability to do work. Objects can have energy by virtue of their motion (kinetic energy), by virtue of their position (potential energy), or by virtue of their mass (see E = mc2).
Note: The most important property of energy is that it is conserved — that is, the total energy of an isolated system does not change with time. This is known as the law of conservation of energy. Energy can, however, change form; for example, it can be turned into mass and back again into energy.
energy en·er·gy (ěn'ər-jē)
n.
The capacity for work or vigorous activity; vigor; power.
The capacity of a physical system to do work.
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