| aside | (noun) a line spoken by an actor to the audience but not intended for others on the stage | - |
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| (noun) a message that departs from the main subject | Synonyms: digression, divagation, excursus, parenthesis |
| asphodel | (noun) any of various chiefly Mediterranean plants of the genera Asphodeline and Asphodelus having linear leaves and racemes of white or pink or yellow flowers | - |
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| aspidistra | (noun) evergreen perennial with large handsome basal leaves; grown primarily as a foliage houseplant | Synonyms: Aspidistra elatio, bar-room plant, cast-iron plant |
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| assiduity | (noun) great and constant diligence and attention | Synonyms: assiduousness, concentration |
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| assiduousness | (noun) great and constant diligence and attention | Synonyms: assiduity, concentration |
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| assuredness | (noun) great coolness and composure under strain | Synonyms: aplomb, cool, poise, sang-froid |
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| asteroid | (noun) any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter) | - |
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| astrodome | (noun) a transparent dome on top of an airplane where the navigator can make celestial observations | - |
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| astrodynamics | (noun) the branch of astronomy that studies the motion of natural and artificial bodies in space | - |
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| asyndeton | (noun) the omission of conjunctions where they would normally be used | - |
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| atherodyde | (noun) a simple type of jet engine; must be launched at high speed | Synonyms: athodyd, flying drainpipe, ramjet, ramjet engine |
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| athodyd | (noun) a simple type of jet engine; must be launched at high speed | Synonyms: atherodyde, flying drainpipe, ramjet, ramjet engine |
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| atmoradiograph | (noun) a device which measures the frequency of occurrence of atmospherics. | - |
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| atrophedema | (noun) recurrent large circumscribed areas of subcutaneous edema; onset is sudden and it disappears within 24 hours; seen mainly in young women, often as an allergic reaction to food or drugs | Synonyms: angioedema, giant hives, periodic edema, Quincke's edema |
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| attainder | (noun) cancellation of civil rights | Synonyms: civil death |
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| attendance | (noun) the act of being present (at a meeting or event etc.) | Synonyms: attending |
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| (noun) the number of people that are present | - |
| (noun) the frequency with which a person is present | - |
| attendant | (noun) an event or situation that happens at the same time as or in connection with another | Synonyms: accompaniment, co-occurrence, concomitant |
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| (noun) someone who waits on or tends to or attends to the needs of another | Synonyms: attender, tender |
| (noun) a person who is present and participates in a meeting | Synonyms: attendee, attender, meeter |
| attendee | (noun) a person who is present and participates in a meeting | Synonyms: attendant, attender, meeter |
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| attender | (noun) someone who waits on or tends to or attends to the needs of another | Synonyms: attendant, tender |
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| (noun) a person who is present and participates in a meeting | Synonyms: attendant, attendee, meeter |
| (noun) someone who listens attentively | Synonyms: auditor, hearer, listener |
| attending | (noun) the act of being present (at a meeting or event etc.) | Synonyms: attendance |
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| (noun) the process whereby a person concentrates on some features of the environment to the (relative) exclusion of others | Synonyms: attention |
| attitude | (noun) a theatrical pose created for effect | - |
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| (noun) the arrangement of the body and its limbs | Synonyms: position, posture |
| (noun) a complex mental state involving beliefs and feelings and values and dispositions to act in certain ways | Synonyms: mental attitude |
| (noun) position of aircraft or spacecraft relative to a frame of reference (the horizon or direction of motion) | - |
| attosecond | (noun) one quintillionth (10^-18) of a second; one thousandth of a femtosecond | - |
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| audaciousness | (noun) fearless daring | Synonyms: audacity, temerity |
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| (noun) aggressive boldness or unmitigated effrontery | Synonyms: audacity |
| audacity | (noun) fearless daring | Synonyms: audaciousness, temerity |
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| (noun) aggressive boldness or unmitigated effrontery | Synonyms: audaciousness |
| audad | (noun) wild sheep of northern Africa | Synonyms: Ammotragus lervia, aoudad, arui, Barbary sheep, maned sheep |
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| audibility | (noun) quality or fact or degree of being audible or perceptible by the ear | Synonyms: audibleness |
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| audible | (noun) a football play is changed orally after both teams have assumed their positions at the line of scrimmage | - |
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| audibleness | (noun) quality or fact or degree of being audible or perceptible by the ear | Synonyms: audibility |
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| audience | (noun) a conference (usually with someone important) | Synonyms: consultation, interview |
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| (noun) a gathering of spectators or listeners at a (usually public) performance | - |
| (noun) the part of the general public interested in a source of information, entertainment, or a product/service | - |
| (noun) an opportunity to state your case and be heard | Synonyms: hearing |
| audile | (noun) one whose mental imagery is auditory rather than visual or motor | - |
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| audio | (noun) the sound elements of television | - |
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| (noun) a recording of acoustic signals | Synonyms: audio recording, sound recording |
| (noun) an audible acoustic wave frequency | Synonyms: audio frequency |
| (noun) the audible part of a transmitted signal | Synonyms: sound |
| audiocassette | (noun) a cassette for audiotape | - |
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| audiogram | (noun) a graphical representation of a person's auditory sensitivity to sound | - |
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| audiology | (noun) the measurement of hearing | Synonyms: audiometry |
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| audiometer | (noun) an instrument used to measure the sensitivity of hearing | Synonyms: sonometer |
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| audiometry | (noun) measuring sensitivity of hearing | - |
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| (noun) the measurement of hearing | Synonyms: audiology |
| audiotape | (noun) magnetic tape for use in recording sound | - |
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| (noun) a tape recording of sound | - |
| audiovisual | (noun) materials using sight or sound to present information | Synonyms: audiovisual aid |
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| audit | (noun) a methodical examination or review of a condition or situation | - |
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| (noun) an inspection of the accounting procedures and records by a trained accountant or CPA | Synonyms: audited account |
| audition | (noun) a test of the suitability of a performer | Synonyms: tryout |
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| (noun) the ability to hear; the auditory faculty | Synonyms: auditory modality, auditory sense, hearing, sense of hearing |
| auditor | (noun) a qualified accountant who inspects the accounting records and practices of a business or other organization | - |
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| (noun) someone who listens attentively | Synonyms: attender, hearer, listener |
| (noun) a student who attends a course but does not take it for credit | - |
| auditorium | (noun) the area of a theater or concert hall where the audience sits | - |
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| augend | (noun) a number to which another number (the addend) is added | - |
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| autacoid | (noun) any physiologically active internal secretion especially one of uncertain classification | Synonyms: autocoid |
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| autoantibody | (noun) an antibody acting against tissues of the organism that produces it | - |
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| autocoid | (noun) any physiologically active internal secretion especially one of uncertain classification | Synonyms: autacoid |
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| autodidact | (noun) a person who has taught himself | - |
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| autoloader | (noun) a firearm that reloads itself | Synonyms: self-loader |
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| autoradiograph | (noun) a radiogram produced by radiation emitted by the specimen being photographed | - |
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| autoradiography | (noun) producing a radiograph by means of the radiation emitted from the specimen being photographed | - |
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| autostrada | (noun) an expressway in an Italian-speaking country | - |
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| avadavat | (noun) red Asian weaverbirds often kept as cage birds | Synonyms: amadavat |
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| avidity | (noun) a positive feeling of wanting to push ahead with something | Synonyms: avidness, eagerness, keenness |
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| avidness | (noun) a positive feeling of wanting to push ahead with something | Synonyms: avidity, eagerness, keenness |
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| avocado | (noun) a pear-shaped tropical fruit with green or blackish skin and rich yellowish pulp enclosing a single large seed | Synonyms: aguacate, alligator pear, avocado pear |
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| (noun) tropical American tree bearing large pulpy green fruits | Synonyms: avocado tree, Persea Americana |
| avoidance | (noun) deliberately avoiding; keeping away from or preventing from happening | Synonyms: dodging, shunning, turning away |
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| avoirdupois | (noun) excess bodily weight | Synonyms: blubber, fat, fatness |
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| (noun) a system of weights based on the 16-ounce pound (or 7,000 grains) | Synonyms: avoirdupois weight |
| award | (noun) a grant made by a law court | Synonyms: awarding |
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| (noun) a tangible symbol signifying approval or distinction | Synonyms: accolade, honor, honour, laurels |
| (noun) something given for victory or superiority in a contest or competition or for winning a lottery | Synonyms: prize |
| awarding | (noun) a grant made by a law court | Synonyms: award |
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| awkwardness | (noun) the carriage of someone whose movements and posture are ungainly or inelegant | Synonyms: clumsiness |
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| (noun) the quality of an embarrassing situation | Synonyms: nuisance value |
| (noun) trouble in carrying or managing caused by bulk or shape | Synonyms: cumbersomeness, unwieldiness |
| (noun) the inelegance of someone stiff and unrelaxed (as by embarrassment) | Synonyms: clumsiness, gracelessness, stiffness |
| (noun) unskillfulness resulting from a lack of training | Synonyms: clumsiness, ineptitude, ineptness, maladroitness, slowness |
| axseed | (noun) European herb resembling vetch; naturalized in the eastern United States; having umbels of pink-and-white flowers and sharp-angled pods | Synonyms: Coronilla varia, crown vetch |
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| azadirachtin | (noun) insecticide | - |
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| azedarach | (noun) tree of northern India and China having purple blossoms and small inedible yellow fruits; naturalized in the southern United States as a shade tree | Synonyms: azederach, China tree, chinaberry, chinaberry tree, Melia azedarach, Melia azederach, Persian lilac, pride-of-India |
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| azederach | (noun) tree of northern India and China having purple blossoms and small inedible yellow fruits; naturalized in the southern United States as a shade tree | Synonyms: azedarach, China tree, chinaberry, chinaberry tree, Melia azedarach, Melia azederach, Persian lilac, pride-of-India |
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| azide | (noun) a chemical compound containing the azido group combined with an element or radical | - |
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| azoimide | (noun) a colorless explosive liquid that is volatile and poisonous and foul-smelling | Synonyms: HN, hydrazoic acid, hydrogen azide |
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| babyhood | (noun) the earliest state of immaturity | Synonyms: infancy |
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| (noun) the early stage of growth or development | Synonyms: early childhood, infancy |
| babyminder | (noun) a person who looks after babies (usually in the person's own home) while the babys' parents are working | Synonyms: baby minder, minder |
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| bachelorhood | (noun) the state of being an unmarried man | - |
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| (noun) the time of a man's life prior to marriage | - |
| backband | (noun) a broad band that passes over the back of a horse and supports the shafts of a vehicle | - |
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| backbend | (noun) an acrobatic feat in which the trunk is bent backward from a standing position until the hands touch the floor | - |
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| backboard | (noun) a board used to support the back of someone or something | - |
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| (noun) a raised vertical board with basket attached; used to play basketball | Synonyms: basketball backboard |
| backdoor | (noun) a secret or underhand means of access (to a place or a position) | Synonyms: back door |
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| (noun) an entrance at the rear of a building | Synonyms: back door, back entrance |
| (noun) an undocumented way to get access to a computer system or the data it contains | Synonyms: back door |
| backdown | (noun) a retraction of a previously held position | Synonyms: climb-down, withdrawal |
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| backdrop | (noun) scenery hung at back of stage | Synonyms: backcloth, background |
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| backfield | (noun) the offensive football players who line up behind the linemen | - |
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| background | (noun) scenery hung at back of stage | Synonyms: backcloth, backdrop |
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| (noun) (computer science) the area of the screen in graphical user interfaces against which icons and windows appear | Synonyms: desktop, screen background |
| (noun) a person's social heritage: previous experience or training | - |
| (noun) the part of a scene (or picture) that lies behind objects in the foreground | Synonyms: ground |
| (noun) information that is essential to understanding a situation or problem | Synonyms: background knowledge |
| (noun) extraneous signals that can be confused with the phenomenon to be observed or measured | Synonyms: background signal |
| (noun) relatively unimportant or inconspicuous accompanying situation | - |
| (noun) the state of the environment in which a situation exists | Synonyms: scope, setting |
| backgrounder | (noun) a press conference or interview in which a government official explains to reporters the background of an action or policy | - |
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| backgrounding | (noun) the execution of low priority programs while higher priority programs are not using the processing system | Synonyms: background processing |
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| backhand | (noun) a return made with the back of the hand facing the direction of the stroke | Synonyms: backhand shot, backhand stroke |
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| backhander | (noun) a backhanded blow | - |
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| backside | (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
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| (noun) the side of an object that is opposite its front | Synonyms: back end, rear |
| backslider | (noun) someone who lapses into previous undesirable patterns of behavior | Synonyms: recidivist, reversionist |
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| backsliding | (noun) a failure to maintain a higher state | Synonyms: lapse, lapsing, relapse, relapsing, reversion, reverting |
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| backsword | (noun) a sword with only one cutting edge | - |
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| (noun) a stick used instead of a sword for fencing | Synonyms: fencing stick, singlestick |
| backwardation | (noun) the market condition wherein the price of a forward or futures contract is trading below the expected spot price at contract maturity. | - |
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| backwardness | (noun) lack of normal development of intellectual capacities | Synonyms: mental retardation, retardation, slowness, subnormality |
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| backwoods | (noun) a remote and undeveloped area | Synonyms: back country, boondocks, hinterland |
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| backwoodsman | (noun) a man who lives on the frontier | Synonyms: frontiersman, mountain man |
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| backyard | (noun) the grounds in back of a house | - |
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| bacteriacide | (noun) any chemical agent that destroys bacteria | Synonyms: bactericide |
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| bactericide | (noun) any drug that destroys bacteria or inhibits their growth | Synonyms: antibacterial, antibacterial drug |
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| (noun) any chemical agent that destroys bacteria | Synonyms: bacteriacide |
| bacteroid | (noun) a rodlike bacterium (especially any of the rod-shaped or branched bacteria in the root nodules of nitrogen-fixing plants) | - |
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| bad | (noun) that which is below standard or expectations as of ethics or decency | Synonyms: badness |
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| badass | (noun) A mean or belligerent person | - |
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| (noun) A person considered impressive due to extreme attitudes, behavior or appearance | - |
| baddeleyite | (noun) a mineral consisting of zirconium oxide | - |
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| baddie | (noun) the principal bad character in a film or work of fiction | Synonyms: villain |
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| badge | (noun) any feature that is regarded as a sign of status (a particular power or quality or rank) | - |
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| (noun) an emblem (a small piece of plastic or cloth or metal) that signifies your status (rank or membership or affiliation etc.) | - |
| badger | (noun) sturdy carnivorous burrowing mammal with strong claws; widely distributed in the Northern Hemisphere | - |
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| badgerer | (noun) someone who tries to embarrass you with gibes and questions and objections | Synonyms: heckler |
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