| energy | | |
| n. (phenomenon) | 1. energy, free energy | (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs.; "energy can take a wide variety of forms" |
| ~ natural philosophy, physics | the science of matter and energy and their interactions.; "his favorite subject was physics" |
| ~ physical phenomenon | a natural phenomenon involving the physical properties of matter and energy. |
| ~ activation energy, energy of activation | the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur.; "catalysts are said to reduce the energy of activation during the transition phase of a reaction" |
| ~ alternative energy | energy derived from sources that do not use up natural resources or harm the environment. |
| ~ atomic energy, nuclear energy | the energy released by a nuclear reaction. |
| ~ binding energy, separation energy | the energy required to separate particles from a molecule or atom or nucleus; equals the mass defect. |
| ~ chemical energy | that part of the energy in a substance that can be released by a chemical reaction. |
| ~ electrical energy, electricity | energy made available by the flow of electric charge through a conductor.; "they built a car that runs on electricity" |
| ~ energy level, energy state | a definite stable energy that a physical system can have; used especially of the state of electrons in atoms or molecules.; "according to quantum theory only certain energy levels are possible" |
| ~ rest energy | the energy equivalent to the mass of a particle at rest in an inertial frame of reference; equal to the rest mass times the square of the speed of light. |
| ~ work | (physics) a manifestation of energy; the transfer of energy from one physical system to another expressed as the product of a force and the distance through which it moves a body in the direction of that force.; "work equals force times distance" |
| ~ heat, heat energy | a form of energy that is transferred by a difference in temperature. |
| ~ mechanical energy | energy in a mechanical form. |
| ~ radiant energy | energy that is transmitted in the form of (electromagnetic) radiation; energy that exists in the absence of matter. |
| ~ radiation | energy that is radiated or transmitted in the form of rays or waves or particles. |
| n. (attribute) | 2. energy, vigor, vigour, zip | forceful exertion.; "he plays tennis with great energy"; "he's full of zip" |
| ~ forcefulness, force, strength | physical energy or intensity.; "he hit with all the force he could muster"; "it was destroyed by the strength of the gale"; "a government has not the vitality and forcefulness of a living man" |
| ~ athleticism, strenuosity | intense energy.; "his music is characterized by a happy athleticism" |
| n. (attribute) | 3. energy, get-up-and-go, push | enterprising or ambitious drive.; "Europeans often laugh at American energy" |
| ~ drive | the trait of being highly motivated.; "his drive and energy exhausted his co-workers" |
| ~ second wind | renewed energy or strength to continue an undertaking.; "She had dinner and got a second wind to finish painting"; "the employers, initially taken by surprise at the pace of developments, regained their second wind" |
| n. (attribute) | 4. energy, muscularity, vigor, vigour, vim | an imaginative lively style (especially style of writing).; "his writing conveys great energy"; "a remarkable muscularity of style" |
| ~ sprightliness, liveliness, spirit, life | animation and energy in action or expression.; "it was a heavy play and the actors tried in vain to give life to it" |
| ~ verve, vitality | an energetic style. |
| n. (state) | 5. energy, vim, vitality | a healthy capacity for vigorous activity.; "jogging works off my excess energy"; "he seemed full of vim and vigor" |
| ~ good health, healthiness | the state of being vigorous and free from bodily or mental disease. |
| ~ juice | energetic vitality.; "her creative juices were flowing" |
| ~ ch'i, chi, ki, qi | the circulating life energy that in Chinese philosophy is thought to be inherent in all things; in traditional Chinese medicine the balance of negative and positive forms in the body is believed to be essential for good health. |
| n. (phenomenon) | 6. energy | any source of usable power.; "the DOE is responsible for maintaining the energy policy" |
| ~ physical phenomenon | a natural phenomenon involving the physical properties of matter and energy. |
| n. (group) | 7. department of energy, doe, energy, energy department | the federal department responsible for maintaining a national energy policy of the United States; created in 1977. |
| ~ executive department | a federal department in the executive branch of the government of the United States. |
| ~ department of energy intelligence, doei | an agency that collects political and economic and technical information about energy matters and makes the Department of Energy's technical and analytical expertise available to other members of the Intelligence Community. |
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