effect (v.) Look up effect at Dictionary.com
"to produce as a result; to bring to a desired end," 1580s, from Latin effectus, past participle of efficere (see effect (n.)). Related: Effecting; effection.
effected (adj.) Look up effected at Dictionary.com
"brought about," past participle adjective from effect (v.). Since early 15c. sometimes used erroneously for affected.
effective (adj.) Look up effective at Dictionary.com
late 14c., "serving to effect the intended purpose," from Old French effectif, from Latin effectivus "productive, effective," from effect-, stem of efficere (see effect (n.)). Of military forces, meaning "fit for action or duty" is from 1680s.
effectively (adv.) Look up effectively at Dictionary.com
1650s, "actually," from effective + -ly (2). From c.1600 as "as a means of producing;" from 1825 as "so as to produce an effect."
effectiveness (n.) Look up effectiveness at Dictionary.com
c.1600, from effective + -ness.
effects (n.) Look up effects at Dictionary.com
"goods, property," 1704, plural of effect (n.); after a use of French effets.
effectual (adj.) Look up effectual at Dictionary.com
"producing an effect; having power to produce an effect," late 14c., Old French effectuel, from Late Latin effectualis, from Latin effectus "accomplishment, performance" (see effect (n.)). Used properly of actions (not agents) and with a sense "having the effect aimed at" (effective is used of the thing done or the agent and means "having great effect"). Related: Effectually; effectualness.
effectuate (v.) Look up effectuate at Dictionary.com
"bring to pass, accomplish, achieve," 1570s, from French effectuer, from Latin effectus "an effecting, accomplishment, performance" (see effect (n.)). According to OED, formed "on the model of" actuate. Related: Effectuated; effectuating.
effeminacy (n.) Look up effeminacy at Dictionary.com
c.1600; see effeminate + -acy.
effeminate (adj.) Look up effeminate at Dictionary.com
late 14c., "womanish; voluptuous; tender," from Latin effeminatus "womanish, effeminate," past participle of effeminare "make a woman of," from ex- "out" (see ex-) + femina "woman" (see feminine). Rarely used but in reproach. The noun meaning "effeminate person" is from 1590s. Related: Effeminately; effemination.
effendi (n.) Look up effendi at Dictionary.com
Turkish title of respect, equivalent to English sir, 1610s, from Turkish efendi, title of respect applied to professionals and officials, corruption of Greek authentes "lord, master" (in Modern Greek aphentes; see authentic).
efferent (adj.) Look up efferent at Dictionary.com
"conveying outward or away," 1827, from Latin efferentem (nominative efferens), present participle of effere "to carry out or away, bring forth," from ef- (see ex-) + ferre "to bear, carry" (see infer). As a noun from 1876.
effervesce (v.) Look up effervesce at Dictionary.com
1702, from Latin effervescere "to boil up, boil over" (see effervescence). Related: Effervesced; effervescing.
effervescence (n.) Look up effervescence at Dictionary.com
1650s, "the action of boiling up," from French effervescence (1640s), from Latin effervescentem, present participle of effervescere "to boil up, boil over," from ex- "out" (see ex-) + fervescere "begin to boil," from fervere "be hot, boil" (see brew). Figurative sense of "liveliness" is from 1748. Related: Effervescency.
effervescent (adj.) Look up effervescent at Dictionary.com
1680s, from Latin effervescentem (nominative effervescens), present participle of effervescere "to boil up, boil over" (see effervescence). Figurative meaning "exuberant" is from 1833.
effete (adj.) Look up effete at Dictionary.com
1620s, "functionless as a result of age or exhaustion," from Latin effetus (usually in fem. effeta) "exhausted, unproductive, worn out (with bearing offspring), past bearing," literally "that has given birth," from a lost verb, *efferi, from ex- "out" (see ex-) + fetus "childbearing, offspring" (see fetus). Figurative use is earliest in English; literal use is rare. Sense of "intellectually or morally exhausted" (1790) led to that of "decadent, effeminate" (by 1850s).
efficacious (adj.) Look up efficacious at Dictionary.com
"sure to have the desired effect" (often of medicines), 1520s, from Latin efficaci-, stem of efficax "effectual, powerful" (see efficacy) + -ous. Related: Efficaciously; efficaciousness.
efficacy (n.) Look up efficacy at Dictionary.com
1520s, from Latin efficacia "efficacy, efficiency," from efficax (genitive efficacis) "powerful, effectual, efficient," from stem of efficere "work out, accomplish" (see effect (n.)). Earlier in same sense was efficace (c.1200), from Old French eficace (14c.), from Latin efficacia; also efficacite (early 15c.), from Latin efficacitatem.
efficiency (n.) Look up efficiency at Dictionary.com
1590s, "power to accomplish something," from Latin efficientia "efficient power; efficiency; influence" (from efficientem; see efficient) + -cy. In mechanics, "ratio of useful work done to energy expended," from 1858. Attested from 1952 as short for efficiency apartment (itself from 1920).
efficient (adj.) Look up efficient at Dictionary.com
late 14c., "making, producing immediate effect, active, effective," from Old French efficient and directly from Latin efficientem (nominative efficiens) "effective, efficient, producing, active," present participle of efficere "work out, accomplish" (see effect). Meaning "productive, skilled" is from 1787. Related: Efficiently.
effigy (n.) Look up effigy at Dictionary.com
"image of a person," 1530s, from Middle French effigie (13c.), from Latin effigies "copy or imitation of something, likeness, image, statue," from or related to effingere "to mold, fashion, portray," from ex- "out" (see ex-) + fingere "to form, shape" (see fiction). The Latin word was regarded as plural and the -s was lopped off by 18c. Especially figures made of stuffed clothing; the burning or hanging of them is attested by 1670s. Formerly done by judicial authorities as symbolic punishment of criminals who had escaped their jurisdiction; later a popular expression against persons deemed obnoxious. Related: Effigial.
effleurage (n.) Look up effleurage at Dictionary.com
"gentle rubbing with the palm of the hand," 1886, from French effleurage, from effleurer "to graze, touch lightly, touch upon, strip the leaves off," from ef- "out" (see ex-) + fleur as in the phrase à fleur de "on a level with," from German Flur "a plain, field, meadow" (see floor (n.)).
effloresce (v.) Look up effloresce at Dictionary.com
"to come into flower," 1775, from Latin efflorescere, inceptive form (in Late Latin simplified to efflorere) "to blossom, spring up, flourish, abound," from ex "out" (see ex-) + florescere "to blossom," from flos (see flora). Sense in chemistry is from 1788.
efflorescence (n.) Look up efflorescence at Dictionary.com
1620s, "a bursting into flower, act of blossoming out," from French efflorescence, from Latin efflorescentem (nominative efflorescens), present participle of efflorescere "to bloom, flourish, blossom" (see effloresce). Sense in chemistry is from 1660s.
efflorescent (adj.) Look up efflorescent at Dictionary.com
1741, from Latin efflorescentem (nominative efflorescens), present participle of efflorescere "to bloom, flourish" (see effloresce).
effluence (n.) Look up effluence at Dictionary.com
c.1600, "that which flows out;" 1620s, "act of flowing out," from Late Latin effluentia, from Latin effluentem (nominative effluens) "flowing out," present participle of effluere "to flow out," from ex- "out" (see ex-) + fluere "to flow" (see fluent). Related: Effluency.
effluent (adj.) Look up effluent at Dictionary.com
mid-15c., from Latin effluentem "flowing out" (see effluence). As a noun, "that which flows out," from 1859; specific meaning "liquid industrial waste" is from 1930.
effluvia (n.) Look up effluvia at Dictionary.com
Latin plural of effluvium. Sometimes mistaken for a singular and re-pluralized.
effluvium (n.) Look up effluvium at Dictionary.com
1640s, from Latin effluvium "a flowing out, an outlet," from effluere "to flow out" (see effluence). Related: Effluvial.
efflux (n.) Look up efflux at Dictionary.com
1640s, "act or state of flowing out," also "that which flows out," from Latin effluxus, past participle of effluere "to flow out" (see effluence).
effort (n.) Look up effort at Dictionary.com
late 15c., "laborious attempt, strenuous exertion," from Middle French effort, from Old French esforz "force, impetuosity, strength, power," verbal noun from esforcier "force out, exert oneself," from Vulgar Latin *exfortiare "to show strength" (source of Italian sforza), from Latin ex- "out" (see ex-) + Latin fortis "strong" (see fort).
Effort is only effort when it begins to hurt. [Ortega y Gasset, 1949]
Related: Efforts "voluntary exertion," also "result of exertion."
effortless (adj.) Look up effortless at Dictionary.com
1752, "passive, making no effort," from effort + -less. Meaning "easy, requiring no effort" is from 1810. Related: Effortlessly; effortlessness.
effrontery (n.) Look up effrontery at Dictionary.com
"shamelessness, impudence, boldness in transgressing the bounds of modesty and propriety," 1715, from French effronterie, from effronté "shameless," from Old French esfronte "shameless, brazen," probably from Late Latin effrontem (nominative effrons) "barefaced, shameless," from Latin ex- "out" (see ex-) + frontem (nominative frons) "brow" (see front (n.)). Also compare affront.

Latin frontus had a sense of "ability to blush," but the literal sense of effrontery often has been taken to be "putting forth the forehead." Forehead in Johnson's Dictionary (1755) has a secondary sense of "impudence; confidence; assurance; audaciousness; audacity." English had an earlier verb effront "treat with effrontery" (17c.).
effulgence (n.) Look up effulgence at Dictionary.com
1660s (Milton), from Late Latin effulgentia (from Latin effulgentum; see effulgent).
effulgent (adj.) Look up effulgent at Dictionary.com
1738, back-formation from effulgence, or else from Latin effulgentem (nominative effulgens), present participle of effulgere "to shine out, gleam forth," from ex "out" (see ex-) + fulgere "to shine" (see bleach (v.)). Related: Effulgently.
effuse (v.) Look up effuse at Dictionary.com
"to pour out, spill," late 14c., from Middle French effuser or directly from Latin effusus "poured out," past participle of effundere "to pour forth" (see effusion). Related: Effused; effusing. Not to be confused with eff youse.
effuse (adj.) Look up effuse at Dictionary.com
1520s, from Latin past participle adjective effusus "poured out," also "extensive, vast, broad, wide" (see effuse (v.)).
effusion (n.) Look up effusion at Dictionary.com
c.1400, "a pouring out," from Middle French effusion (14c.) and directly from Latin effusionem (nominative effusio) "a pouring forth," noun of action from past participle stem of effundere "pour forth, spread abroad; to lavish, squander, waste," from ex- "out" (see ex-) + fundere "pour" (see found (v.2)). Figuratively, of speech, emotion, etc., from 1650s.
effusive (adj.) Look up effusive at Dictionary.com
"flowing profusely" (especially of words), 1660s, from Latin effus-, stem of effundere "to pour forth, spread abroad" (see effusion) + -ive. Hence, "with extravagant display of feelings" (1863). Related: Effusively.
eft (n.) Look up eft at Dictionary.com
Old English efte, efeta "small lizard-like animal," of unknown origin (see newt).
eftsoons (adv.) Look up eftsoons at Dictionary.com
obsolete or archaic way of saying "soon afterward," from Old English eftsona "a second time, repeatedly, soon after, again," from eft "afterward, again, a second time" (from Proto-Germanic *aftiz, from PIE root *apo- "off, away;" see apo-) + sona "immediately" (see soon). With adverbial genitive. Not in living use since 17c.
egad (interj.) Look up egad at Dictionary.com
1670s, I gad, a softened oath, second element God, first uncertain; perhaps it represents exclamation ah.
egalitarian (adj.) Look up egalitarian at Dictionary.com
1881, from French égalitaire, from Old French egalite "equality," from Latin aequalitatem (see equality). Originally often in egalitarian despotism, such as the government resulting from the French Revolution or the ideas of the communists. The noun, "person who favors egalitarianism," is from 1920.
egalitarianism (n.) Look up egalitarianism at Dictionary.com
1884, from egalitarian + -ism.
Egbert Look up Egbert at Dictionary.com
masc. proper name, from Old English Ecg-beorht, literally "sword-bright." See edge (n.) + bright (adj.).
egest (v.) Look up egest at Dictionary.com
"to discharge, pass off, expel," especially "defecate," c.1600, from Latin egestus, past participle of egerere "to bring out, discharge, vomit," from assimilated form of ex- "out" (see ex-) + gerere "to carry, bear" (see gest). The opposite of ingest. Related: Egested; egesting; egesta.
egestion (n.) Look up egestion at Dictionary.com
"act of voiding the refuse of digestion," early 15c., from Latin egestionem (nominative egestio), noun of action from past participle stem of egerere "to discharge" (see egest).
egg (n.) Look up egg at Dictionary.com
mid-14c., egge, mostly in northern England dialect, from Old Norse egg, from Proto-Germanic *ajja(m) (cognates: Old Saxon, Middle Dutch, Dutch, Old High German, German ei, Gothic ada), probably from PIE *owyo-/*oyyo- "egg" (cognates: Old Church Slavonic aja, Russian jajco, Breton ui, Welsh wy, Greek oon, Latin ovum); possibly derived from root *awi- "bird."

This Norse-derived northern word vied in Middle English with native cognates eye, eai, from Old English æg, until finally displacing the others after c.1500. Caxton (15c.) writes of a merchant (probably a north-country man) in a public house on the Thames who asked for eggs:
And the goode wyf answerde, that she coude speke no frenshe. And the marchaunt was angry, for he also coude speke no frenshe, but wolde have hadde egges, and she understode hym not.
She did, however, recognize another customer's request for "eyren." Used of persons from c.1600. Bad egg in the figurative sense is from 1855; bad eggs aren't always obvious to outward view (there was an old proverb, "bad bird, bad egg"). To have egg on (one's) face "look foolish" is attested by 1948.
[Young & Rubincam] realize full well that a crew can sometimes make or break a show. It can do little things to ruin a program or else, by giving it its best, can really get that all-important rating. They are mindful of an emcee of a variety show who already has been tabbed "old egg in your face" because the crew has managed to get him in such awkward positions on the TV screen. ["Billboard," March 5, 1949]
Eggs Benedict attested by 1898. The figure of speech represented in to have all (one's) eggs in one basket is attested by 1660s.
egg (v.) Look up egg at Dictionary.com
c.1200, from Old Norse eggja "to goad on, incite," from egg "edge" (see edge (n.)). The unrelated verb meaning "to pelt with (rotten) eggs" is from 1857, from egg (n.). Related: Egged; egging.
egg-beater (n.) Look up egg-beater at Dictionary.com
also eggbeater, 1828, from egg (n.) + beater. Slang sense of "helicopter" is from 1937 from notion of whirling rotation.