A-frame Look up A-frame at Dictionary.com
type of framework shaped like the letter A, 1909; in building construction, attested from 1932.
A-line (adj.) Look up A-line at Dictionary.com
descriptive of a dress or skirt flared in shape of a letter "A," 1955, in reference to the designs of Christian Dior (1905-1957).
A-list (adj.) Look up A-list at Dictionary.com
in celebrity sense, 1984, from A in the sense of "first, best" (as in A-1) + list (n.).
A-OK Look up A-OK at Dictionary.com
1961, said to be an abbreviation of all (systems) OK; popularized in the jargon of U.S. astronauts. See OK.
A.A. Look up A.A. at Dictionary.com
also AA, abbreviation of Alcoholics Anonymous, attested by 1941, American English. The group name was the title of a book published in 1938 by the founder, Bill W.
A.A.A. Look up A.A.A. at Dictionary.com
also AAA, abbreviation of American Automobile Association, attested 1902, American English, the year the organization was founded.
A.D. Look up A.D. at Dictionary.com
1570s, from Latin Anno Domini "Year of the Lord." First put forth by Dionysius Exiguus in 527 or 533 C.E., but at first used only for Church business. Introduced in Italy in 7c., France (partially) in 8c. In England, first found in a charter of 680 C.E. Ordained for all ecclesiastical documents in England by the Council of Chelsea, July 27, 816.

The resistance to it in part might have come because Dionysius chose 754 A.U.C. as the birth year of Jesus, while many early Christians would have thought it was 750 A.U.C. [See John J. Bond, "Handy-Book of Rules and Tables for Verifying Dates With the Christian Era," 4th ed., London: George Bell & Sons, 1889] A.C., for Anno Christi, also was common 17c.
a.k.a. Look up a.k.a. at Dictionary.com
also aka, initialism (acronym) for also known as; attested in legal documents from at least 1936.
a.m. Look up a.m. at Dictionary.com
in hours, 1762, abbreviation of Latin ante meridiem "before noon."
a.m. Look up a.m. at Dictionary.com
also AM, type of radio wave broadcast; see amplitude.
A.P.R. Look up A.P.R. at Dictionary.com
also APR, abbreviation of annual percentage rate, attested from 1979, American English.
a.s.a.p. Look up a.s.a.p. at Dictionary.com
also asap, pronounced either as a word or as four letters; from initial letters of phrase "as soon as possible," 1955, originally U.S. Army jargon.
A.V. Look up A.V. at Dictionary.com
abbreviation of Authorized Version (of the English Bible, 1611) attested from 1868.
aardvark (n.) Look up aardvark at Dictionary.com
1833, from Afrikaans Dutch aardvark, literally "earth-pig" (the animal burrows), from aard "earth" (see earth) + vark "pig," cognate with Old High German farah (source of German Ferkel "young pig, sucking pig," a diminutive form), Old English fearh (see farrow).
Aaron Look up Aaron at Dictionary.com
masc. proper name, in the Old Testament the brother of Moses, from Hebrew Aharon, probably of Egyptian origin. The Arabic form is Harun. Aaron's beard as a type of herb is from 1540s.
ab initio Look up ab initio at Dictionary.com
c.1600, Latin, literally "from the beginning," from oblique case of initium "entrance, beginning," related to verb inire "to go into, enter upon, begin" (see initial).
ab- Look up ab- at Dictionary.com
word-forming element meaning "away, from, from off, down;" from Latin ab-, ab "off, away from," from PIE root *apo- (see apo-). Reduced to a- before -m-, -p-, or -v-; sometimes abs- before -c- or -t-.
aback (adv.) Look up aback at Dictionary.com
c.1200, from Old English on bæc "at or on the back;" see back (n.). Now surviving mainly in taken aback, originally a nautical expression in reference to a vessel's square sails when a sudden change of wind flattens them back against the masts and stops the forward motion of the ship (1754). The figurative sense is first recorded 1840.
abacus (n.) Look up abacus at Dictionary.com
late 14c., "sand table for drawing, calculating, etc.," from Latin abacus, from Greek abax (genitive abakos) "counting table," from Hebrew abaq "dust," from root a-b-q "to fly off." Originally a drawing board covered with dust or sand that could be written on to do mathematical equations. Specific reference to a counting frame is 17c. or later.
Abaddon Look up Abaddon at Dictionary.com
late 14c., used in Rev. ix:11 of "the angel of the bottomless pit," and by Milton of the pit itself, from Hebrew Abhaddon "destruction," from abhadh "he perished." The Greek form was Apollyon.
abaft (adv.) Look up abaft at Dictionary.com
"in or at the back part of a ship" (opposed to forward), 1590s, from Middle English on baft (Old English on bæftan) "backwards." The second component is itself a compound of be "by" (see by) and æftan "aft" (see aft). The word has been saved by the sailors (the stern being the "after" part of a vessel), the rest of the language having left it in Middle English.
abalienate (v.) Look up abalienate at Dictionary.com
1550s, from Latin abalienatus, past participle of abalienare "to remove, literally "to make alien," from ab- (see ab-) + alienare (see alienate). Related: Abalienated; abalienating.
abalienation (n.) Look up abalienation at Dictionary.com
1650s, from Latin abalienationem (nominative abalienatio), noun of action from past participle stem of abalienare (see abalienate).
abalone (n.) Look up abalone at Dictionary.com
type of marine shell, 1850, American English, from Spanish abulon from Costanoan (a California coastal Indian language family) aluan "red abalone."
abandon (v.) Look up abandon at Dictionary.com
late 14c., "to give up, surrender (oneself or something), give over utterly; to yield (oneself) utterly (to religion, fornication, etc.)," from Old French abandoner (12c.), from adverbial phrase à bandon "at will, at discretion," from à "at, to" (see ad-) + bandon "power, jurisdiction," from Latin bannum, "proclamation," from a Frankish word related to ban (v.).
Mettre sa forest à bandon was a feudal law phrase in the 13th cent. = mettre sa forêt à permission, i.e. to open it freely to any one for pasture or to cut wood in; hence the later sense of giving up one's rights for a time, letting go, leaving, abandoning. [Auguste Brachet, "An Etymological Dictionary of the French Language," transl. G.W. Kitchin, Oxford, 1878]
Etymologically, the word carries a sense of "put someone under someone else's control." Meaning "to give up absolutely" is from late 14c. Related: Abandoned; abandoning.
abandon (n.) Look up abandon at Dictionary.com
"a letting loose, surrender to natural impulses," 1822, from a sense in French abandon (see abandon (v.). Borrowed earlier (c.1400) from French in a sense "(someone's) control;" and compare Middle English adverbial phrase at abandon, i.e. "recklessly," attested from late 14c.
abandoned (adj.) Look up abandoned at Dictionary.com
"self-devoted" to some purpose (usually evil), late 14c., past participle adjective from abandon (v.).
abandonment (n.) Look up abandonment at Dictionary.com
1610s, from French abandonnement, from abandonner (see abandon (v.)).
abase (v.) Look up abase at Dictionary.com
late 14c., abaishen, from Old French abaissier "diminish, make lower in value or status" (12c.), from Vulgar Latin *ad bassiare "bring lower," from Late Latin bassus "thick, fat, low;" from the same source as base (adj.) and altered 16c. in English by influence of it, which made it an exception to the rule that Old French verbs with stem -iss- enter English as -ish. Related: Abased; abasing.
abasement (n.) Look up abasement at Dictionary.com
early 15c., "embarrassment, dread, fear," from abase + -ment. Sense of "action of lowering in price" is mid-15c.; "action of lowering in rank" is 1560s; "condition of being abased" is from 1610s.
abash (v.) Look up abash at Dictionary.com
"perplex, embarrass," early 15c., earlier "lose one's composure, be upset" (late 14c.), from Old French esbaiss-, present stem of esbaer "gape with astonishment," from es "out" (see ex-) + ba(y)er "to be open, gape," from Latin *batare "to yawn, gape," from root *bat, possibly imitative of yawning. Related: Abashed; abashing. Bashful is a 16c. derivative.
abate (v.) Look up abate at Dictionary.com
"put an end to" (c.1300); "to grow less, diminish in power or influence" (early 14c.), from Old French abattre "beat down, cast down," from Vulgar Latin *abbatere, from Latin ad "to" (see ad-) + battuere "to beat" (see batter (v.)). Secondary sense of "to fell, slaughter" is in abatis and abattoir. Related: Abated; abating.
abatement (n.) Look up abatement at Dictionary.com
mid-14c., from Old French abatement, from abattre (see abate).
abatis (n.) Look up abatis at Dictionary.com
"defense made of felled trees," 1766, from French abatis, literally "things thrown down," from Old French abateis, from abattre "to beat down, throw down" (see abate).
abattoir (n.) Look up abattoir at Dictionary.com
"slaughterhouse for cows," 1820, from French abattre "to beat down" (see abate) + suffix -oir, corresponding to Latin -orium (see -ory).
ABBA Look up ABBA at Dictionary.com
Swedish pop music group formed 1972, the name dates from 1973 and is an acronym from the first names of the four band members: Anni-Frid Lyngstad, Björn Ulvaeus, Benny Andersson, Agnetha Fältskog.
Abba Look up Abba at Dictionary.com
title of honor, from Latin abba, from Greek abba, from Aramaic abba "the father, my father," emphatic of abh "father."
Abbassid Look up Abbassid at Dictionary.com
dynasty of caliphs of Baghdad (750-1258) claiming descent from Abbas (566-652), uncle of Muhammad. For his name, see abbot.
abbe (n.) Look up abbe at Dictionary.com
1520s, title given in France to "every one who wears an ecclesiastical dress," especially one having no assigned ecclesiastical duty, from French abbé, from Late Latin abbatem, accusative of abbas (see abbot).
abbess (n.) Look up abbess at Dictionary.com
c.1300, abbese, from Old French abbesse, from Late Latin abbatissa, fem. of abbas (see abbot). Replaced earlier abbotess.
abbey (n.) Look up abbey at Dictionary.com
mid-13c., "convent headed by an abbot or abbess," from Anglo-French abbeie, Old French abaïe, from Late Latin abbatia, from abbas (genitive abbatis); see abbot.
abbot (n.) Look up abbot at Dictionary.com
Old English abbod "abbot," from Latin abbatem (nominative abbas), from Greek abbas, from Aramaic abba, title of honor, literally "the father, my father," emphatic state of abh "father." The Latin fem. abbatissa is root of abbess.
abbreviate (v.) Look up abbreviate at Dictionary.com
mid-15c., from Latin abbreviatus, past participle of abbreviare "to shorten" (see abbreviation). Also sometimes 15c. abbrevy, from Middle French abrevier (14c.), from Latin abbreviare. Related: Abbreviated; abbreviating.
abbreviation (n.) Look up abbreviation at Dictionary.com
mid-15c., from Middle French abréviation (15c.), from Late Latin abbreviationem (nominative abbreviatio), noun of action from past participle stem of abbreviare "make brief," from Latin ad "to" (see ad-) + breviare "shorten," from brevis "short, low, little, shallow" (see brief (adj.)).
ABC (n.) Look up ABC at Dictionary.com
"the alphabet," late 13c., abece. Sense "rudiments or fundamentals (of a subject)" is from late 14c. From 1944 (in a "Billboard" headline) as a shortening of American Broadcasting Company. Related: ABCs.
Abderian laughter (n.) Look up Abderian laughter at Dictionary.com
from Abdera, in Thrace, whose citizens were proverbial as rustic simpletons who would laugh at anything or anyone they didn't understand (making their town the Hellenic equivalent of Gotham).
abdicate (v.) Look up abdicate at Dictionary.com
1540s, "to disown, disinherit (children)," from Latin abdicatus, past participle of abdicare "to disown, disavow, reject" (specifically abdicare magistratu "renounce office"), from ab- "away" (see ab-) + dicare "proclaim," from stem of dicere "to speak, to say" (see diction). Meaning "divest oneself of office" first recorded 1610s. Related: Abdicated; abdicating.
abdication (n.) Look up abdication at Dictionary.com
1550s, "a disowning," from Latin abdicationem (nominative abdicatio) "renunciation, abdication," noun of action from past participle stem of abdicare (see abdicate); sense of "resignation of sovereignty" is from 1680s.
abdomen (n.) Look up abdomen at Dictionary.com
1540s, "belly fat," from Latin abdomen "belly," of unknown origin, perhaps from abdere "conceal," with a sense of "concealment of the viscera," or else "what is concealed" by proper dress. De Vaan, however, finds this derivation "unfounded." Purely anatomical sense is from 1610s. Zoological sense of "posterior division of the bodies of arthropods" first recorded 1788.
abdominal (adj.) Look up abdominal at Dictionary.com
1550s, from medical Latin abdominalis, from abdomen (genitive abdominis); see abdomen.