8. energy a source of usable power, as fossil fuel or electricity.
Etymology: (1575–85; < LL energīa < Gk enérgeia activity <energe- (s. of energeîn to be in action, operate =en-en -2+-ergeîn, der. of érgos work ) +-ia -y3)
Definition of 'ENERGY'
Princeton's WordNet
1. (noun)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"
2. (noun)energy, vigor, vigour, zip forceful exertion "he plays tennis with great energy"; "he's full of zip"
3. (noun)energy, push, get-up-and-go enterprising or ambitious drive "Europeans often laugh at American energy"
4. (noun)energy, muscularity, vigor, vigour, vim an imaginative lively style (especially style of writing) "his writing conveys great energy"; "a remarkable muscularity of style"
5. (noun)energy, vim, vitality a healthy capacity for vigorous activity "jogging works off my excess energy"; "he seemed full of vim and vigor"
6. (noun)energy any source of usable power "the DOE is responsible for maintaining the energy policy"
7. (noun)Department of Energy, Energy Department, Energy, DOE the federaldepartment responsible for maintaining a nationalenergypolicy of the United States; created in 1977
1. (noun)energy the power your body and mindhave available Good food gives you energy.; mental energy; I don't have the energy to try.; Kittens are full of energy and fun.
2. energy the fuels and resources that make electricity, run cars, etc. nuclear/solar/wind energy; the need to find renewable sources of energy; to save/conserve energy
Definition of 'ENERGY'
Webster Dictionary
1. (noun)ENERGY internal or inherent power; capacity of acting, operating, or producing an effect, whether exerted or not; as, men possessing energies may suffer them to lie inactive
2. (noun)ENERGY power efficiently and forcibly exerted; vigorous or effectual operation; as, the energy of a magistrate
3. (noun)ENERGY strength of expression; force of utterance; power to impress the mind and arouse the feelings; life; spirit; -- said of speech, language, words, style; as, a stylefull of energy
1. ENERGY The capacity for doing work. It is measured by work units which involve the exercise of force along a path of some length. A foot-pound, centimeter-gram, and centimeter-dyne are units of energy and work.
The dimensions of energy are force (M * L / T^2) * space (L) = M * (L^2 / T^2). Energy may be chemical (atomic or molecular), mechanical, electrical, thermal, physical, potential, kinetic, or actual, and other divisions could be formulated.
Sense: the ability to act, or the habit of acting, strongly and vigorously He has amazing energy for his age; That child has too much energy; I must devote my energies to gardening today.
Definitions of ENERGY 
Afrikaans: energie
Arabic: نَشاط، حَيَوِيَّه
Bulgarian: сила
Brazilian: energia
Czech: energie
German: die Energie
Danish: energi; kræfter
Greek: ενεργητικότητα
Spanish: energía
Estonian: energia
Farsi: انرژی؛ توان
Finnish: energia
French: énergie
Hebrew: מֶרֶץ
Hindi: ऊर्जा
Croatian: energija
Hungarian: energia
Indonesian: tenaga
Icelandic: orka, kraftur
Italian: energia
Japanese: 精力
Korean: 활력
Lithuanian: energija
Latvian: enerģija
Malay: tenaga
Dutch: energie
Norwegian: energi, (handle)kraft
Polish: energia
Persian: انرژی؛ توان
Pashto: انرجى، قوت، شيمه، دمه تون
Portuguese: energia
Romanian: energie
Russian: энергия; усилия
Slovak: energia
Slovenian: energija
Serbian: energija
Swedish: energi
Thai: กำลัง
Turkish: enerji, takat
Taiwanese: 活力，精力，幹勁
Ukrainian: енергія, сила
Urdu: اہلیت کار
Vietnamese: năng lực
Chinese: 活力，干劲，能力
