aura (n.) Look up aura at Dictionary.com
1870 in spiritualism, "subtle emanation around living beings;" earlier "characteristic impression" made by a personality (1859), earlier still "gentle breeze" (late 14c.), from Latin aura "breeze, wind, air," from Greek aura "breath, breeze," from PIE root *awer- (see air (n.1)).
aural (adj.) Look up aural at Dictionary.com
1847, "pertaining to the ear," from Latin auris "ear" (see ear (n.1)) + -al (1). Meaning "received or perceived by ear" is attested from 1860. Related: Aurally.
aureate (adj.) Look up aureate at Dictionary.com
early 15c., "gold, gold-colored," also figuratively, "splendid, brilliant," from Latin aureatus "decorated with gold," from aureus "golden," from aurum "gold," from PIE root *aus- (2) "gold" (cognates: Sanskrit ayah "metal," Avestan ayo, Latin aes "brass," Old English ar "brass, copper, bronze," Gothic aiz "bronze," Old Lithuanian ausas "gold"), probably related to root *aus- "to shine" (see aurora).
aureole (n.) Look up aureole at Dictionary.com
early 13c., from Latin aureola (corona), fem. diminutive of aureus "golden" (see aureate). In medieval Christianity, the celestial crown worn by martyrs, virgins, etc., as victors over the flesh.
auricle (n.) Look up auricle at Dictionary.com
part of the ear, 1650s, from Latin auricula "ear," diminutive of auris (see ear (n.1)). As a chamber of the heart, early 15c., from Latin, so called from a perceived similarity in shape to an animal's ear.
auricular (adj.) Look up auricular at Dictionary.com
1540s, "auditory" (originally of confessions), from Medieval Latin auricularis, from Latin auricula (see auricle). Meaning "pertaining to the ear" is from 1640s.
auriferous (adj.) Look up auriferous at Dictionary.com
"containing gold," 1727, from Latin aurifer "gold-bearing," from auri-, comb. form of aurum "gold" (see aureate) + -fer "producing, bearing" (see infer).
Auriga Look up Auriga at Dictionary.com
northern constellation, from Latin auriga "a charioteer, driver," from aureae "bridle of a horse" (from os, genitive oris, "mouth;" see oral) + agere "set in motion, drive, lead" (see act (n.)).
aurochs (n.) Look up aurochs at Dictionary.com
1766, misapplication to the European bison (Bos bison) of a word that actually refers to a species of wild ox (Bos ursus) that went extinct 17c., from German Aurochs, from Old High German urohso, from uro "aurochs" (cognate with Old English ur, Old Norse ürr), of unknown origin, + ohso "ox" (see ox). Latin urus and Greek ouros are Germanic loan-words.
aurora (n.) Look up aurora at Dictionary.com
late 14c., from Latin Aurora, the Roman goddess of dawn, from PIE *ausus- "dawn," also the name of the Indo-European goddess of the dawn, from root *aus- (1) "to shine," especially of the dawn (cognates: Greek eos "dawn," auein "to dry, kindle;" Sanskrit usah, Lithuanian ausra "dawn;" Latin auster "south wind," usum "to burn;" Old English east "east").
aurora borealis (n.) Look up aurora borealis at Dictionary.com
1620s, "Northern Lights," literally "northern dawn," said to have been coined by French philosopher Petrus Gassendus (1592-1655) after a spectacular display seen in France Sept. 2, 1621; see aurora + boreal. In northern Scotland and among sailors, sometimes called the dancers or the merry dancers.
auroral (adj.) Look up auroral at Dictionary.com
1550s, "pertaining to dawn," from aurora + -al (1). Meaning "of the color of dawn" is from 1827; "of the aurora" from 1828.
auscultate (v.) Look up auscultate at Dictionary.com
"to listen" (especially with a stethoscope), 1832, from Latin auscultatus, past participle of auscultare "to listen attentively to," from aus-, from auris "ear" (see ear (n.1)); "the rest is doubtful" [OED]. Tucker suggests the second element is akin to clinere "to lean, bend."
auscultation (n.) Look up auscultation at Dictionary.com
"act of listening," 1630s, from Latin auscultationem (nominative auscultatio), noun of action from past participle stem of auscultare (see auscultate). Medical sense is from 1821.
auspex (n.) Look up auspex at Dictionary.com
1590s, "one who observes flights of birds for the purpose of taking omens," from Latin auspex "interpreter of omens given by birds," from PIE *awi-spek- "observer of birds," from *awi- "bird" (see aviary) + *spek- "to see" (see scope (n.1)). Compare Greek oionos "bird of prey," also "bird of omen, omen," and ornis "bird," which also could mean "omen."
auspices (n.) Look up auspices at Dictionary.com
plural (and now the usual form) of auspice; 1530s, "observation of birds for the purpose of taking omens," from French auspice (14c.), from Latin auspicum "divination from the flight of birds; function of an auspex" (q.v.). Meaning "any indication of the future (especially favorable)" is from 1650s; earlier (1630s) in extended sense of "benevolent influence of greater power, influence exerted on behalf of someone or something," originally in expression under the auspices of.
auspicious (adj.) Look up auspicious at Dictionary.com
1590s, "of good omen" (implied in auspiciously), from Latin auspicium "divination by observing the flight of birds," from auspex (genitive auspicis) + -ous. Related: Auspiciously; auspiciousness.
Aussie (n.) Look up Aussie at Dictionary.com
short for Australian (n.) or Australia, attested from 1917.
auster (n.) Look up auster at Dictionary.com
"south wind," late 14c., from Latin auster "the south wind; the south country" (see Australia).
austere (adj.) Look up austere at Dictionary.com
early 14c., from Old French austere (Modern French austère) and directly from Latin austerus "dry, harsh, sour, tart," from Greek austeros "bitter, harsh," especially "making the tongue dry" (originally used of fruits, wines), metaphorically "austere, harsh," from PIE *saus- "dry" (cognates: Greek auos "dry," auein "to dry"). Use in English is figurative: "stern, severe, very simple." Related: Austerely.
austerity (n.) Look up austerity at Dictionary.com
mid-14c., "sternness, harshness," from Old French austerite "harshness, cruelty" (14c.) and directly from Late Latin austeritatem (nominative austeritas), from austerus (see austere). Of severe self-discipline, from 1580s; hence "severe simplicity" (1875); applied during World War II to national policies limiting non-essentials as a wartime economy.
Austin Look up Austin at Dictionary.com
surname (also Austen) and masc. proper name, from Old French Aousten, an abbreviated form of Latin Augustine.
austral (adj.) Look up austral at Dictionary.com
1540s, from Latin australis, from auster (see auster).
Australia Look up Australia at Dictionary.com
from Latin Terra Australis (16c.), from australis "southern" + -ia. A hypothetical southern continent, known as terra australis incognita, had been proposed since 2c. Dutch explorers called the newfound continent New Holland; the current name was suggested 1814 by Matthew Flinders as an improvement over Terra Australis "as being more agreeable to the ear, and an assimilation to the name of the other great portions of the earth" ["Voyage to Terra Australis"]. In 1817 Gov. Lachlan Macquarie, having read Flinders' suggestion, began using it in official correspondence. The ultimate source is Latin auster "south wind," hence, "the south country."

The Latin sense shift in australis, if it is indeed the same word other Indo-European languages use for east (see aurora), for which Latin uses oriens (see orient), perhaps is based on a false assumption about the orientation of the Italian peninsula, "with shift through 'southeast' explained by the diagonal position of the axis of Italy" [Buck]; see Walde, Alois, "Lateinisches etymologisches Wörterbuch," 3rd. ed., vol. 1, p.87; Ernout, Alfred, and Meillet, Alfred, "Dictionnaire étymologique de la langue latine," 2nd. ed., p.94. Or perhaps the connection is more ancient, and from PIE root *aus- "to shine," source of aurora, which also produces words for "burning," with reference to the "hot" south wind that blows into Italy. Thus auster "(hot) south wind," metaphorically extended to "south."
Australian (n.) Look up Australian at Dictionary.com
1690s, in reference to aboriginal inhabitants, from Australia + -an. As an adjective by 1814. Australianism in speech is attested from 1891.
Australopithecus (n.) Look up Australopithecus at Dictionary.com
1925, coined by Australian anthropologist Raymond A. Dart (1893-1988) from Latin australis "southern" (see Australia) + Greek pithekos "ape." So called because first discovered in South Africa.
Austria Look up Austria at Dictionary.com
European nation, from Medieval Latin Marchia austriaca "eastern borderland." German Österreich is "eastern kingdom," from Old High German ostar "eastern" (see east) + reich (see Reichstag). So called for being on the eastern edge of Charlemagne's empire.
Austro- Look up Austro- at Dictionary.com
comb. form meaning "Austrian;" see Austria.
autarchy (n.) Look up autarchy at Dictionary.com
1660s, "absolute sovereignty," from Greek autarkhia, from autarkhein "to be an absolute ruler," from autos "self" (see auto-) + arkhein "to rule" (see archon).
autarky (n.) Look up autarky at Dictionary.com
1610s, "self-sufficiency," from Greek autarkeia "sufficiency in oneself, independence," from autarkes "self-sufficient, having enough, independent of others" (also used of countries), from autos "self" (see auto-) + arkein "to ward off, keep off," also "to be strong enough, sufficient," from PIE root *ark- "to hold, contain, guard" (see arcane). From a different Greek source than autarchy, and thus the spelling. As a term in international economics, prominent late 1930s. Related: Autarkic.
auteur (n.) Look up auteur at Dictionary.com
1962, from French, literally "author" (see author (n.)).
authentic (adj.) Look up authentic at Dictionary.com
mid-14c., "authoritative," from Old French autentique (13c., Modern French authentique) "authentic; canonical," and directly from Medieval Latin authenticus, from Greek authentikos "original, genuine, principal," from authentes "one acting on one's own authority," from autos "self" (see auto-) + hentes "doer, being," from PIE *sene- "to accomplish, achieve." Sense of "entitled to acceptance as factual" is first recorded mid-14c.

Traditionally (at least since the 18c.), authentic implies that the contents of the thing in question correspond to the facts and are not fictitious; genuine implies that the reputed author is the real one; though this distinction is not etymological and is not always now recognized.
authenticate (v.) Look up authenticate at Dictionary.com
"verify, establish the credibility of," 1650s, from Medieval Latin authenticatus, past participle of authenticare, from authenticus (see authentic). Related: Authenticated; authenticating.
authentication (n.) Look up authentication at Dictionary.com
1788, noun of action from authenticate (v.).
authenticity (n.) Look up authenticity at Dictionary.com
1760; see authentic + -ity. Earlier form was authentity (1650s).
author (n.) Look up author at Dictionary.com
c.1300, autor "father," from Old French auctor, acteor "author, originator, creator, instigator (12c., Modern French auteur), from Latin auctorem (nominative auctor) "enlarger, founder, master, leader," literally "one who causes to grow," agent noun from auctus, past participle of augere "to increase" (see augment). Meaning "one who sets forth written statements" is from late 14c. The -t- changed to -th- 16c. on mistaken assumption of Greek origin.
...[W]riting means revealing onesself to excess .... This is why one can never be alone enough when one writes, why even night is not night enough. ... I have often thought that the best mode of life for me would be to sit in the innermost room of a spacious locked cellar with my writing things and a lamp. Food would be brought and always put down far away from my room, outside the cellar's outermost door. The walk to my food, in my dressing gown, through the vaulted cellars, would be my only exercise. I would then return to my table, eat slowly and with deliberation, then start writing again at once. And how I would write! From what depths I would drag it up! [Franz Kafka]
author (v.) Look up author at Dictionary.com
1590s, from author (n.). Revived 1940s, chiefly U.S. Related: Authored; authoring.
authorial (adj.) Look up authorial at Dictionary.com
1796, from author (n.) + -al (1).
authorisation (n.) Look up authorisation at Dictionary.com
chiefly British English spelling of authorization (q.v.); for spelling, see -ize.
authorise (v.) Look up authorise at Dictionary.com
chiefly British English spelling of authorize (q.v.); for suffix, see -ize. Related: Authorised; authorising.
authoritarian (adj.) Look up authoritarian at Dictionary.com
1862, "favoring imposed order over freedom," from authority + -an. Compare authoritative, which originally had this meaning to itself. Noun in the sense of one advocating or practicing such governance is from 1859.
authoritarianism (n.) Look up authoritarianism at Dictionary.com
1883; see authoritarian + -ism. Early use mostly in communist jargon.
authoritative (adj.) Look up authoritative at Dictionary.com
c.1600, "dictatorial" (a sense now restricted to authoritarian), from Medieval Latin authoritativus (see authority). Meaning "possessing authority" is recorded from 1650s; that of "proceeding from proper authority" is from 1809. Related: Authoritatively; authoritativeness.
authority (n.) Look up authority at Dictionary.com
early 13c., autorite "book or quotation that settles an argument," from Old French auctorité "authority, prestige, right, permission, dignity, gravity; the Scriptures" (12c.; Modern French autorité), from Latin auctoritatem (nominative auctoritas) "invention, advice, opinion, influence, command," from auctor "master, leader, author" (see author (n.)).

Usually spelled with a -c- in English till 16c., when it was dropped in imitation of the French. Meaning "power to enforce obedience" is from late 14c.; meaning "people in authority" is from 1610s. Authorities "those in charge, those with police powers" is recorded from mid-19c.
authorization (n.) Look up authorization at Dictionary.com
c.1600, from authorize + -ation. Earlier form was auctorisation (late 15c.).
authorize (v.) Look up authorize at Dictionary.com
"give formal approval to," late 14c., autorisen, from Old French autoriser "authorize, give authority to" (12c.), from Medieval Latin auctorizare, from auctor (see author (n.)). Modern spelling from 16c. Related: Authorized; authorizing.
authorship (n.) Look up authorship at Dictionary.com
c.1500, "the function of being a writer," from author (n.) + -ship. Meaning "literary origin" is attested from 1825.
autism (n.) Look up autism at Dictionary.com
1912, from German Autismus, coined 1912 by Swiss psychiatrist Paul Bleuler (1857-1939) from comb. form of Greek autos- "self" (see auto-) + -ismos suffix of action or of state. The notion is of "morbid self-absorption."
autistic (adj.) Look up autistic at Dictionary.com
1912 (Bleuler), from autism (q.v.). Noun meaning "person with autism" is recorded from 1968 (earlier in this sense was autist).
auto (n.) Look up auto at Dictionary.com
shortened form of automobile, 1899; same development yielded French auto.