| arbitrable | (adjective) appropriate for or subject to settlement by arbitration | - |
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| arguable | (adjective) open to argument or debate | Synonyms: debatable, disputable, moot |
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| (adjective) capable of being supported by argument | - |
| arguably | (adverb) as can be shown by argument | - |
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| ascendable | (adjective) capable of being ascended | Synonyms: ascendible, climbable |
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| ascendible | (adjective) capable of being ascended | Synonyms: ascendable, climbable |
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| ascertainable | (adjective) capable of being ascertained or found out | Synonyms: discoverable |
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| ascribable | (adjective) capable of being assigned or credited to | Synonyms: due, imputable, referable |
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| assailable | (adjective) not defended or capable of being defended | Synonyms: open, undefendable, undefended |
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| assemblage | (noun) the social act of assembling | Synonyms: assembly, gathering |
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| (noun) a system of components assembled together for a particular purpose | Synonyms: hookup |
| (noun) a group of persons together in one place | Synonyms: gathering |
| (noun) several things grouped together or considered as a whole | Synonyms: accumulation, aggregation, collection |
| assemble | (verb) create by putting components or members together | Synonyms: piece, put together, set up, tack, tack together |
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| (verb) collect in one place | Synonyms: foregather, forgather, gather, meet |
| (verb) get people together | Synonyms: gather, get together |
| assembler | (noun) a program to convert assembly language into machine language | Synonyms: assembly program |
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| assembling | (noun) the act of gathering something together | Synonyms: aggregation, collecting, collection |
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| assembly | (noun) the social act of assembling | Synonyms: assemblage, gathering |
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| (noun) the act of constructing something (as a piece of machinery) | Synonyms: fabrication |
| (noun) a group of machine parts that fit together to form a self-contained unit | - |
| (noun) a public facility to meet for open discussion | Synonyms: forum, meeting place |
| (noun) a unit consisting of components that have been fitted together | - |
| (noun) a group of persons who are gathered together for a common purpose | - |
| assemblyman | (noun) someone who is a member of a legislative assembly | - |
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| assemblywoman | (noun) a woman assemblyman | - |
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| assertable | (adjective) capable of being affirmed or asserted | Synonyms: affirmable |
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| assessable | (adjective) capable of being considered carefully | - |
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| (adjective) capable of being assessed especially for the purpose of taxation | - |
| assignable | (adjective) legally transferable to the ownership of another | Synonyms: conveyable, negotiable, transferable, transferrable |
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| assimilable | (adjective) able to be absorbed and incorporated into body tissues | - |
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| associable | (adjective) capable of being associated | - |
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| associableness | (noun) the capability of being easily associated or joined or connected in thought | Synonyms: associability |
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| attachable | (adjective) capable of being fastened or added to something else | - |
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| attainable | (adjective) capable of being attained or accomplished | Synonyms: come-at-able |
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| attainableness | (noun) the state of being achievable | Synonyms: achievability, attainability |
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| attractable | (adjective) capable of being magnetized or attracted by a magnet | - |
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| attributable | (adjective) capable of being attributed | - |
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| audible | (adjective) heard or perceptible by the ear | Synonyms: hearable |
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| (noun) a football play is changed orally after both teams have assumed their positions at the line of scrimmage | - |
| audibleness | (noun) quality or fact or degree of being audible or perceptible by the ear | Synonyms: audibility |
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| audibly | (adverb) in an audible manner | - |
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| available | (adjective) obtainable or accessible and ready for use or service | - |
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| (adjective) convenient for use or disposal | Synonyms: usable, useable |
| (adjective) not busy; not otherwise committed | Synonyms: uncommitted |
| availableness | (noun) the quality of being at hand when needed | Synonyms: accessibility, availability, handiness |
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| avertable | (adjective) capable of being avoided or warded off | Synonyms: avertible, avoidable, evitable |
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| avertible | (adjective) capable of being avoided or warded off | Synonyms: avertable, avoidable, evitable |
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| avoidable | (adjective) capable of being avoided or warded off | Synonyms: avertable, avertible, evitable |
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| babble | (noun) gibberish resembling the sounds of a baby | Synonyms: babbling, lallation |
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| (verb) to talk foolishly | Synonyms: blather, blether, blither, smatter |
| (verb) divulge confidential information or secrets | Synonyms: babble out, blab, blab out, let the cat out of the bag, peach, sing, spill the beans, talk, tattle |
| (verb) utter meaningless sounds, like a baby, or utter in an incoherent way | - |
| (verb) flow in an irregular current with a bubbling noise | Synonyms: bubble, burble, guggle, gurgle, ripple |
| babbler | (noun) any of various insectivorous Old World birds with a loud incessant song; in some classifications considered members of the family Muscicapidae | Synonyms: cackler |
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| (noun) an obnoxious and foolish and loquacious talker | Synonyms: chatterbox, chatterer, magpie, prater, spouter |
| babbling | (noun) gibberish resembling the sounds of a baby | Synonyms: babble, lallation |
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| backblast | (noun) backfire from a recoilless weapon | Synonyms: back-blast |
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| bailable | (adjective) eligible for bail | - |
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| (adjective) admitting of bail | - |
| bankable | (adjective) acceptable to or at a bank | - |
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| (adjective) guaranteed to bring a profit | - |
| bauble | (noun) cheap showy jewelry or ornament on clothing | Synonyms: bangle, fallal, gaud, gewgaw, novelty, trinket |
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| (noun) a mock scepter carried by a court jester | - |
| bbl | (noun) any of various units of capacity | Synonyms: barrel |
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| bearable | (adjective) capable of being borne though unpleasant | Synonyms: endurable, sufferable, supportable |
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| beatable | (adjective) susceptible to being defeated | Synonyms: vanquishable, vincible |
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| believable | (adjective) capable of being believed | Synonyms: credible |
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| believably | (adverb) in a believable manner | - |
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| (adverb) easy to believe on the basis of available evidence | Synonyms: credibly, plausibly, probably |
| bendable | (adjective) capable of being bent or flexed or twisted without breaking | Synonyms: pliable, pliant, waxy |
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| bestubbled | (adjective) having a short growth of beard | Synonyms: stubbled, stubbly |
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| bible | (noun) a book regarded as authoritative in its field | - |
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| bibless | (adjective) lacking a bib | - |
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| biblical | (adjective) of or pertaining to or contained in or in accordance with the Bible | Synonyms: scriptural |
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| (adjective) in keeping with the nature of the Bible or its times or people | - |
| bibliographer | (noun) someone trained in compiling bibliographies | - |
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| bibliographic | (adjective) relating to or dealing with bibliography | Synonyms: bibliographical |
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| bibliographical | (adjective) relating to or dealing with bibliography | Synonyms: bibliographic |
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| bibliography | (noun) a list of writings with time and place of publication (such as the writings of a single author or the works referred to in preparing a document etc.) | - |
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| bibliolatrous | (adjective) given to Bible-worship | - |
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| bibliolatry | (noun) the worship of the Bible | Synonyms: Bible-worship |
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| bibliomania | (noun) preoccupation with the acquisition and possession of books | - |
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| bibliomaniacal | (adjective) characteristic of or characterized by or noted for bibliomania | - |
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| bibliophile | (noun) someone who loves (and usually collects) books | Synonyms: book lover, booklover |
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| bibliophilic | (adjective) of or relating to bibliophiles | - |
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| bibliopole | (noun) a dealer in secondhand books (especially rare or curious books) | Synonyms: bibliopolist |
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| bibliopolic | (adjective) of or relating to bibliopoles | - |
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| bibliopolist | (noun) a dealer in secondhand books (especially rare or curious books) | Synonyms: bibliopole |
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| bibliothec | (noun) a professional person trained in library science and engaged in library services | Synonyms: librarian |
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| bibliotheca | (noun) a collection of books | - |
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| bibliothecal | (adjective) of or relating to a library or bibliotheca or a librarian | Synonyms: bibliothecarial |
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| bibliothecarial | (adjective) of or relating to a library or bibliotheca or a librarian | Synonyms: bibliothecal |
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| bibliotic | (adjective) of or relating to bibliotics | - |
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| bibliotics | (noun) the scientific study of documents and handwriting etc. especially to determine authorship or authenticity | - |
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| bibliotist | (noun) someone who engages in bibliotics | - |
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| biddable | (adjective) willing to carry out the orders or wishes of another without protest | Synonyms: acquiescent |
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| bindable | (adjective) capable of being fastened or secured with a rope or bond | Synonyms: bondable |
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| biodegradable | (adjective) capable of being decomposed by e.g. bacteria | - |
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| blab | (verb) divulge confidential information or secrets | Synonyms: babble, babble out, blab out, let the cat out of the bag, peach, sing, spill the beans, talk, tattle |
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| (verb) speak (about unimportant matters) rapidly and incessantly | Synonyms: blabber, chatter, clack, gabble, gibber, maunder, palaver, piffle, prate, prattle, tattle, tittle-tattle, twaddle |
| blabber | (noun) one who reveals confidential information to the police or other authority | Synonyms: betrayer, informer, rat, squealer |
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| (verb) speak (about unimportant matters) rapidly and incessantly | Synonyms: blab, chatter, clack, gabble, gibber, maunder, palaver, piffle, prate, prattle, tattle, tittle-tattle, twaddle |
| blabbermouth | (noun) someone who gossips indiscreetly | Synonyms: talebearer, taleteller, tattler, tattletale, telltale |
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| blabbermouthed | (adjective) prone to communicate confidential information | Synonyms: leaky, talebearing, tattling |
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| (adjective) unwisely talking too much | Synonyms: bigmouthed, blabby, talkative |
| blabby | (adjective) unwisely talking too much | Synonyms: bigmouthed, blabbermouthed, talkative |
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| black | (adjective) being of the achromatic color of maximum darkness; having little or no hue owing to absorption of almost all incident light | - |
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| (adjective) of or belonging to a racial group especially of sub-Saharan African origin | - |
| (adjective) marked by anger or resentment or hostility | - |
| (adjective) (of the face) made black especially as with suffused blood | Synonyms: blackened |
| (adjective) (of intelligence operations) deliberately misleading | - |
| (adjective) extremely dark | Synonyms: pitch-black, pitch-dark |
| (adjective) soiled with dirt or soot | Synonyms: smutty |
| (adjective) (used of conduct or character) deserving or bringing disgrace or shame | Synonyms: disgraceful, ignominious, inglorious, opprobrious, shameful |
| (adjective) stemming from evil characteristics or forces; wicked or dishonorable | Synonyms: dark, sinister |
| (adjective) offering little or no hope | Synonyms: bleak, dim |
| (adjective) distributed or sold illicitly | Synonyms: black-market, bootleg, contraband, smuggled |
| (adjective) harshly ironic or sinister | Synonyms: grim, mordant |
| (adjective) (of coffee) without cream or sugar | - |
| (adjective) (of events) having extremely unfortunate or dire consequences; bringing ruin | Synonyms: calamitous, disastrous, fatal, fateful |
| (noun) black clothing (worn as a sign of mourning) | - |
| (noun) (board games) the darker pieces | - |
| (noun) the quality or state of the achromatic color of least lightness (bearing the least resemblance to white) | Synonyms: blackness, inkiness |
| (noun) total absence of light | Synonyms: blackness, lightlessness, pitch blackness, total darkness |
| (verb) make or become black | Synonyms: blacken, melanise, melanize |
| blackamoor | (noun) a person with dark skin who comes from Africa (or whose ancestors came from Africa) | Synonyms: Black person |
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| blackball | (noun) the act of excluding someone by a negative vote or veto | Synonyms: barring |
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| (verb) expel from a community or group | Synonyms: ban, banish, cast out, ostracise, ostracize, shun |
| (verb) vote against; refuse to endorse; refuse to assent | Synonyms: negative, veto |
| blackbeetle | (noun) dark brown cockroach originally from orient now nearly cosmopolitan in distribution | Synonyms: Asiatic cockroach, Blatta orientalis, oriental cockroach, oriental roach |
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| blackberry | (noun) large sweet black or very dark purple edible aggregate fruit of any of various bushes of the genus Rubus | - |
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| (noun) bramble with sweet edible black or dark purple berries that usually do not separate from the receptacle | Synonyms: blackberry bush |
| (verb) pick or gather blackberries | - |
| blackbird | (noun) any bird of the family Icteridae whose male is black or predominantly black | Synonyms: New World blackbird |
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| (noun) common black European thrush | Synonyms: European blackbird, merl, merle, ousel, ouzel, Turdus merula |
| blackboard | (noun) sheet of slate; for writing with chalk | Synonyms: chalkboard |
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| blackbody | (noun) a hypothetical object capable of absorbing all the electromagnetic radiation falling on it | Synonyms: black body, full radiator |
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| blackbuck | (noun) common Indian antelope with a dark back and spiral horns | Synonyms: Antilope cervicapra, black buck |
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| blackcap | (noun) small brownish-grey warbler with a black crown | Synonyms: Silvia atricapilla |
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| (noun) chickadee having a dark crown | Synonyms: black-capped chickadee, Parus atricapillus |
| (noun) small black-headed European gull | Synonyms: Larus ridibundus, laughing gull, pewit, pewit gull |
| (noun) raspberry native to eastern North America having black thimble-shaped fruit | Synonyms: black raspberry, blackcap raspberry, Rubus occidentalis, thimbleberry |
| blackcock | (noun) male black grouse | Synonyms: black cock |
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| blackdamp | (noun) the atmosphere in a mine following an explosion; high in carbon dioxide and incapable of supporting life | Synonyms: chokedamp |
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| blacken | (verb) make or become black | Synonyms: black, melanise, melanize |
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| (verb) burn slightly and superficially so as to affect color | Synonyms: char, scorch, sear |
| blackened | (adjective) (of the face) made black especially as with suffused blood | Synonyms: black |
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| (adjective) darkened by smoke | - |
| blackening | (noun) changing to a darker color | Synonyms: darkening |
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| blackface | (noun) the makeup (usually burnt cork) used by a performer in order to imitate a Negro | - |
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| blackfish | (noun) female salmon that has recently spawned | - |
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| (noun) small dark-colored whale of the Atlantic coast of the United States; the largest male acts as pilot or leader for the school | Synonyms: black whale, common blackfish, Globicephala melaena, pilot whale |
| (noun) large dark-colored food fish of the Atlantic coast of North America | Synonyms: tautog, Tautoga onitis |
| blackfly | (noun) small blackish stout-bodied biting fly having aquatic larvae; sucks the blood of birds as well as humans and other mammals | Synonyms: black fly, buffalo gnat |
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| (noun) blackish aphid that infests e.g. beans and sugar beets | Synonyms: Aphis fabae, bean aphid |
| blackguard | (noun) someone who is morally reprehensible | Synonyms: bounder, cad, dog, heel, hound |
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| (verb) use foul or abusive language towards | Synonyms: abuse, clapperclaw, shout |
| (verb) subject to laughter or ridicule | Synonyms: guy, jest at, laugh at, make fun, poke fun, rib, ridicule, roast |
| blackguardly | (adjective) lacking principles or scruples | Synonyms: rascally, roguish, scoundrelly |
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| blackhead | (noun) a black-tipped plug clogging a pore of the skin | Synonyms: comedo |
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