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.

synonym: free energy.

Roget 686: exertion, effort, strain, tug, pull, stress, throw, stretch, struggle, spell, spurt, spirt^†; stroke of work, stitch of work.    a strong pull a long pull and a pull all a strong pull a long pull and a pull all together;" dead lift; heft; gymnastics; exercise, exercitation^†; wear and tear; ado; toil and trouble; uphill work, hard work, warm work; harvest time.    labor, work, toil, travail, manual labor, sweat of one's brow, swink^†, drudgery, slavery, fagging^†, hammering; limae labor [Lat.]; industry, industriousness, operoseness^†, operosity^†.    trouble, pains, duty; resolution etc. 604; energy etc. (physical) 171.    ... show more

Roget 820: affections, affect; character, qualities, disposition, nature, spirit, tone; temper, temperament; diathesis^†, idiosyncrasy; cast of mind, cast of soul, habit of mind, habit of soul, frame of mind, frame of soul; predilection, turn, natural turn of mind; bent, bias, predisposition, proneness, proclivity, propensity, propenseness^†, propension^†, propendency^†; vein, humor, mood, grain, mettle; sympathy etc. (love) 897.    soul, heart, breast, bosom, inner man; heart's core, heart's strings, heart's blood; heart of hearts, bottom of one's heart, penetralia mentis [Lat.]; secret and inmost recesses of the heart, cockles of one's heart; inmost heart, inmost soul; backbone.    passion, pervading spirit; ruling passion, master passion; furore^†; fullness of the heart, heyday of the blood, flesh and blood, flow of soul.    energy, fervor, fire, force.    ... show more

Roget 157: power; potency, potentiality; jiva^†; puissance, might, force, energy etc. 171; dint; right hand, right arm; ascendency^†, sway, control; prepotency, prepollence^†; almightiness, omnipotence; authority etc. 737; strength etc. 159.    ability; ableness etc. adj.^†; competency; efficacy; efficiency, productivity, expertise (skill) 698; validity, cogency; enablement^†; vantage ground; influence etc. 175.    pressure; conductivity; elasticity; gravity, electricity, magnetism, galvanism, voltaic electricity, voltaism, electromagnetism; atomic power, nuclear power, thermonuclear power; fuel cell; hydraulic power, water power, hydroelectric power; solar power, solar energy, solar panels; tidal power; wind power; attraction; vis inertiae [Lat.], vis mortua [Lat.], vis viva [Lat.]; potential energy, dynamic energy; dynamic friction, dynamic suction; live circuit, live rail, live wire.    capability, capacity; quid valeant humeri quid ferre recusent [Lat.]; faculty, quality, attribute, endowment, virtue, gift, property, qualification, susceptibility.    ... show more

Dutch: energie
Polish: energia

Forceful exertion:
— He plays tennis with great energy.

synonyms: vigor, vigour, zip.

Roget 604: determination, will; iron will, unconquerable will; will of one's own, decision, resolution; backbone; clear grit, true grit, grit [U.S.]; sand, strength of mind, strength of will; resolve etc. (intent) 620; firmness etc. (stability) 150; energy, manliness, vigor; game, pluck; resoluteness etc. (courage) 861; zeal etc. 682; aplomb; desperation; devotion, devotedness.    mastery over self; self control, self command, self possession, self reliance, self government, self restraint, self conquest, self denial; moral courage, moral strength; perseverance etc. 604.1; tenacity; obstinacy etc. 606; bulldog; British lion.    ... show more

Roget 159: strength; power etc. 157; energy etc. 171; vigor, force; main force, physical force, brute force; spring, elasticity, tone, tension, tonicity.    stoutness etc. adj.; lustihood^†, stamina, nerve, muscle, sinew, thews and sinews, physique; pith, pithiness; virtility, vitality.    athletics, athleticism^†; gymnastics, feats of strength.    adamant, steel, iron, oak, heart of oak; iron grip; grit, bone.    athlete, gymnast, acrobat; superman, Atlas, Hercules, Antaeus^†, Samson, Cyclops, Goliath; tower of strength; giant refreshed.    strengthening etc. v.; invigoration, refreshment, refocillation^†.    [Science of forces] dynamics, statics.    ... show more

Roget 171: energy, physical energy, force, power etc. 157; keenness etc. adj.; intensity, vigor, strength, elasticity; go; high pressure; fire; rush.    acrimony, acritude^†; causiticity^†, virulence; poignancy; harshness etc. adj.; severity, edge, point; pungency etc. 392.    cantharides; seasoning etc. (condiment) 393.    activity, agitation, effervescence; ferment, fermentation; ebullition, splutter, perturbation, stir, bustle; voluntary energy etc. 682; quicksilver.    resolution etc. (mental energy) 604; exertion etc. (effort) 686; excitation etc. (mental) 824.    ... show more

Dutch: arbeidsvermogen, daadkracht, energie, fut, geestkracht, kloekheid, pep, pit, puf, slagkracht
Polish: demon

Enterprising or ambitious drive:
— Europeans often laugh at American energy.

synonyms: get-up-and-go, push.

Polish: temperament, dynamiczność, tonus życiowy, ikra, swada, werwa, rzeźwość, żywość, żywotność, wigor, życie, dziarskość, energia, rześkość, witalizm, energiczność, witalność, żwawość ... show more

An imaginative lively style (especially style of writing):
— His writing conveys great energy.

synonyms: muscularity, vigor, vigour, vim.

Roget 682: activity; briskness, liveliness etc. adj.; animation, life, vivacity, spirit, dash, energy; snap, vim.    nimbleness, agility; smartness, quickness etc. adj.; velocity, etc. 274; alacrity, promptitude; despatch, dispatch; expedition; haste etc. 684; punctuality etc. (early) 132.    eagerness, zeal, ardor, perfervidum aingenium [Lat.], empressement [Fr.], earnestness, intentness; abandon; vigor etc. (physical energy) 171; devotion etc. (resolution) 604; exertion etc. 686.    industry, assiduity; assiduousness etc. adj.; sedulity; laboriousness; drudgery etc. (labor) 686; painstaking, diligence; perseverance etc. 604.1; indefatigation^†; habits of business.    vigilance etc. 459; wakefulness; sleeplessness, restlessness; insomnia; pervigilium^†, insomnium^†; racketing.    movement, bustle, stir, fuss, ado, bother, pottering, fidget, fidgetiness; flurry etc. (haste) 684.    officiousness; dabbling, meddling; interference, interposition, intermeddling; tampering with, intrigue.    press of business, no sinecure, plenty to do, many irons in the fire, great doings, busy hum of men, battle of life, thick of the action.    housewife, busy bee; new brooms; sharp fellow, sharp blade; devotee, enthusiast, zealot, meddler, intermeddler, intriguer, busybody, pickthank^†; hummer, hustler, live man [U.S.], rustler [U.S.].    ... show more

Dutch: bloei

A healthy capacity for vigorous activity:
— Jogging works off my excess energy.

synonyms: vim, vitality.

Any source of usable power.

Dutch: energiebron
Polish: źródło energii

The federal department responsible for maintaining a national energy policy of the United States; created in 1977.

synonyms: Department of Energy, DOE, Energy Department.