|—n , pl -gies|
|1.||intensity or vitality of action or expression; forcefulness|
|2.||capacity or tendency for intense activity; vigour|
|3.||vigorous or intense action; exertion|
|a. the capacity of a body or system to do work|
|b. E a measure of this capacity, expressed as the work that it does in changing to some specified reference state. It is measured in joules (SI units)|
|5.||kinetic energy See also potential energy a source of power|
|[C16: from Late Latin energīa, from Greek energeia activity, from energos effective, from |
energy en·er·gy (ěn'ər-jē)
The capacity for work or vigorous activity; vigor; power.
The capacity of a physical system to do work.
energy [%PREMIUM_LINK%] (ěn'ər-jē) Pronunciation Key |
The capacity or power to do work, such as the capacity to move an object (of a given mass) by the application of force. Energy can exist in a variety of forms, such as electrical, mechanical, chemical, thermal, or nuclear, and can be transformed from one form to another. It is measured by the amount of work done, usually in joules or watts. See also conservation of energy, kinetic energy, potential energy. Compare power, work.
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.