| affidavit | (noun) written declaration made under oath; a written statement sworn to be true before someone legally authorized to administer an oath | - |
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| afropavo | (noun) both sexes are brightly colored | Synonyms: Afropavo congensis, Congo peafowl |
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| agave | (noun) tropical American plants with basal rosettes of fibrous sword-shaped leaves and flowers in tall spikes; some cultivated for ornament or for fiber | Synonyms: American aloe, century plant |
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| aggravation | (noun) unfriendly behavior that causes anger or resentment | Synonyms: irritation, provocation |
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| (noun) action that makes a problem or a disease (or its symptoms) worse | Synonyms: exacerbation |
| (noun) an exasperated feeling of annoyance | Synonyms: exasperation |
| aggravator | (noun) an unpleasant person who is annoying or exasperating | Synonyms: annoyance |
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| airwave | (noun) medium for radio and television broadcasting | Synonyms: air |
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| akvavit | (noun) Scandinavian liquor usually flavored with caraway seeds | Synonyms: aquavit |
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| alphavirus | (noun) an arbovirus of the family Togaviridae that can cause a variety of encephalitis in horses | - |
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| amadavat | (noun) red Asian weaverbirds often kept as cage birds | Synonyms: avadavat |
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| aquavit | (noun) Scandinavian liquor usually flavored with caraway seeds | Synonyms: akvavit |
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| architrave | (noun) the lowest part of an entablature; rests immediately on the capitals of the columns | - |
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| (noun) the molding around a door or window | - |
| arenavirus | (noun) animal viruses belonging to the family Arenaviridae | - |
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| astronavigation | (noun) navigating according to the positions of the stars | Synonyms: celestial navigation |
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| atavism | (noun) a reappearance of an earlier characteristic | Synonyms: reversion, throwback |
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| atavist | (noun) an organism that has the characteristics of a more primitive type of that organism | Synonyms: throwback |
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| autoclave | (noun) a device for heating substances above their boiling point; used to manufacture chemicals or to sterilize surgical instruments | Synonyms: steriliser, sterilizer |
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| avadavat | (noun) red Asian weaverbirds often kept as cage birds | Synonyms: amadavat |
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| avail | (noun) a means of serving | Synonyms: help, service |
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| availability | (noun) the quality of being at hand when needed | Synonyms: accessibility, availableness, handiness |
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| availableness | (noun) the quality of being at hand when needed | Synonyms: accessibility, availability, handiness |
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| avalanche | (noun) a slide of large masses of snow and ice and mud down a mountain | - |
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| (noun) a sudden appearance of an overwhelming number of things | - |
| avaram | (noun) evergreen Indian shrub with vivid yellow flowers whose bark is used in tanning; sometimes placed in genus Cassia | Synonyms: Cassia auriculata, Senna auriculata, tanner's cassia |
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| avarice | (noun) reprehensible acquisitiveness; insatiable desire for wealth (personified as one of the deadly sins) | Synonyms: avaritia, covetousness, greed, rapacity |
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| (noun) extreme greed for material wealth | Synonyms: avariciousness, covetousness, cupidity |
| avariciousness | (noun) extreme greed for material wealth | Synonyms: avarice, covetousness, cupidity |
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| avaritia | (noun) reprehensible acquisitiveness; insatiable desire for wealth (personified as one of the deadly sins) | Synonyms: avarice, covetousness, greed, rapacity |
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| avatar | (noun) the manifestation of a Hindu deity (especially Vishnu) in human or superhuman or animal form | - |
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| (noun) a new personification of a familiar idea | Synonyms: embodiment, incarnation |
| avenger | (noun) someone who takes vengeance | Synonyms: retaliator |
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| avens | (noun) any of various perennials of the genus Geum having usually pinnate basal leaves and variously colored flowers | - |
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| aventail | (noun) a medieval hood of mail suspended from a basinet to protect the head and neck | Synonyms: camail, ventail |
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| aventurine | (noun) a translucent quartz spangled with bits of mica or other minerals | Synonyms: sunstone |
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| avenue | (noun) a line of approach | - |
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| (noun) a wide street or thoroughfare | Synonyms: boulevard |
| average | (noun) a statistic describing the location of a distribution | Synonyms: norm |
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| (noun) an intermediate scale value regarded as normal or usual | - |
| (noun) (sports) the ratio of successful performances to opportunities | - |
| averageness | (noun) ordinariness as a consequence of being average and not outstanding | Synonyms: mediocrity |
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| (noun) the state of being that is average; indicates normality but with connotations of mediocrity | - |
| averment | (noun) a declaration that is made emphatically (as if no supporting evidence were necessary) | Synonyms: assertion, asseveration |
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| aversion | (noun) the act of turning yourself (or your gaze) away | Synonyms: averting |
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| (noun) a feeling of intense dislike | Synonyms: antipathy, distaste |
| averting | (noun) the act of preventing something from occurring | - |
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| (noun) the act of turning yourself (or your gaze) away | Synonyms: aversion |
| aviary | (noun) a building where birds are kept | Synonyms: bird sanctuary, volary |
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| aviation | (noun) travel via aircraft | Synonyms: air, air travel |
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| (noun) the art of operating aircraft | Synonyms: airmanship |
| (noun) the aggregation of a country's military aircraft | Synonyms: air power |
| (noun) the operation of aircraft to provide transportation | - |
| aviator | (noun) someone who operates an aircraft | Synonyms: aeronaut, flier, flyer |
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| aviatress | (noun) a woman aviator | Synonyms: airwoman, aviatrix |
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| aviatrix | (noun) a woman aviator | Synonyms: airwoman, aviatress |
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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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| avifauna | (noun) the birds of a particular region or period | - |
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| avionics | (noun) science and technology of electronic systems and devices for aeronautics and astronautics | - |
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| avitaminosis | (noun) any of several diseases caused by deficiency of one or more vitamins | Synonyms: hypovitaminosis |
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| avo | (noun) 100 avos equal 1 pataca in Macao | - |
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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 |
| avocation | (noun) an auxiliary activity | Synonyms: by-line, hobby, pursuit, sideline, spare-time activity |
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| avocet | (noun) long-legged web-footed black-and-white shorebird with slender upward-curving bill | - |
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| 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 |
| avouchment | (noun) a statement asserting the existence or the truth of something | Synonyms: affirmation, avowal |
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| avowal | (noun) a statement asserting the existence or the truth of something | Synonyms: affirmation, avouchment |
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| avower | (noun) someone who admits or acknowledges openly and boldly | - |
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| (noun) someone who claims to speak the truth | Synonyms: affirmer, asserter, asseverator, declarer |
| avulsion | (noun) a forcible tearing or surgical separation of one body part from another | - |
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| (noun) an abrupt change in the course of a stream that forms the boundary between two parcels of land resulting in the loss of part of the land of one landowner and a consequent increase in the land of another | - |
| baklava | (noun) rich Middle Eastern cake made of thin layers of flaky pastry filled with nuts and honey | - |
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| balaclava | (noun) a cap that is close-fitting and woolen and covers all of the head but the face | Synonyms: balaclava helmet |
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| basketweaver | (noun) someone skilled in weaving baskets | Synonyms: basketmaker |
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| beaver | (noun) large semiaquatic rodent with webbed hind feet and a broad flat tail; construct complex dams and underwater lodges | - |
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| (noun) a hat made with the fur of a beaver (or similar material) | Synonyms: castor |
| (noun) a movable piece of armor on a medieval helmet used to protect the lower face | - |
| (noun) a man's hat with a tall crown; usually covered with silk or with beaver fur | Synonyms: dress hat, high hat, opera hat, silk hat, stovepipe, top hat, topper |
| (noun) a full beard | - |
| (noun) the soft brown fur of the beaver | Synonyms: beaver fur |
| behavior | (noun) manner of acting or controlling yourself | Synonyms: behaviour, conduct, doings |
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| (noun) (psychology) the aggregate of the responses or reactions or movements made by an organism in any situation | Synonyms: behaviour |
| (noun) (behavioral attributes) the way a person behaves toward other people | Synonyms: behaviour, conduct, demeanor, demeanour, deportment |
| (noun) the action or reaction of something (as a machine or substance) under specified circumstances | Synonyms: behaviour |
| behaviorism | (noun) an approach to psychology that emphasizes observable measurable behavior | Synonyms: behavioristic psychology, behaviourism, behaviouristic psychology |
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| behaviorist | (noun) a psychologist who subscribes to behaviorism | Synonyms: behaviourist |
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| behaviour | (noun) manner of acting or controlling yourself | Synonyms: behavior, conduct, doings |
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| (noun) (psychology) the aggregate of the responses or reactions or movements made by an organism in any situation | Synonyms: behavior |
| (noun) (behavioral attributes) the way a person behaves toward other people | Synonyms: behavior, conduct, demeanor, demeanour, deportment |
| (noun) the action or reaction of something (as a machine or substance) under specified circumstances | Synonyms: behavior |
| behaviourism | (noun) an approach to psychology that emphasizes observable measurable behavior | Synonyms: behaviorism, behavioristic psychology, behaviouristic psychology |
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| behaviourist | (noun) a psychologist who subscribes to behaviorism | Synonyms: behaviorist |
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| bereaved | (noun) a person who has suffered the death of someone they loved | Synonyms: bereaved person |
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| bereavement | (noun) state of sorrow over the death or departure of a loved one | Synonyms: mourning |
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| bioflavinoid | (noun) a vitamin that maintains the resistance of cell and capillary walls to permeation | Synonyms: citrin, vitamin P |
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| bonavist | (noun) perennial twining vine of Old World tropics having trifoliate leaves and racemes of fragrant purple pea-like flowers followed by maroon pods of edible seeds; grown as an ornamental and as a vegetable on the Indian subcontinent; sometimes placed in genus Dolichos | Synonyms: Dolichos lablab, Egyptian bean, hyacinth bean, Indian bean, Lablab purpureus |
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| brainwave | (noun) the clear (and often sudden) understanding of a complex situation | Synonyms: brainstorm, insight |
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| (noun) (neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph | Synonyms: brain wave, cortical potential |
| brassavola | (noun) any of various tropical American orchids with usually solitary fleshy leaves and showy white to green nocturnally fragrant blossoms solitary or in racemes of up to 7 | - |
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| bravado | (noun) a swaggering show of courage | Synonyms: bluster |
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| brave | (noun) people who are brave | - |
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| (noun) a North American Indian warrior | - |
| braveness | (noun) a quality of spirit that enables you to face danger or pain without showing fear | Synonyms: bravery, courage, courageousness |
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| bravery | (noun) a quality of spirit that enables you to face danger or pain without showing fear | Synonyms: braveness, courage, courageousness |
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| (noun) feeling no fear | Synonyms: fearlessness |
| bravo | (noun) a cry of approval as from an audience at the end of great performance | - |
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| (noun) a murderer (especially one who kills a prominent political figure) who kills by a surprise attack and often is hired to do the deed | Synonyms: assassin, assassinator |
| bravura | (noun) brilliant and showy technical skill | - |
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| bunyavirus | (noun) an animal virus belonging to the family Bunyaviridae; can be used as a bioweapon | - |
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| burgrave | (noun) the military governor of a German town in the 12th and 13th centuries | - |
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| (noun) a nobleman ruling a German castle and surrounding grounds by hereditary right | - |
| cadaver | (noun) the dead body of a human being | Synonyms: clay, corpse, remains, stiff |
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| cadaverine | (noun) a colorless toxic ptomaine with an unpleasant odor formed during the putrefaction of animal tissue | - |
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| canavanine | (noun) an amino acid found in the jack bean | - |
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| caravan | (noun) a camper equipped with living quarters | Synonyms: van |
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| (noun) a procession (of wagons or mules or camels) traveling together in single file | Synonyms: train, wagon train |
| caravanning | (noun) the practice of taking holidays in a caravan | - |
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| caravansary | (noun) an inn in some eastern countries with a large courtyard that provides accommodation for caravans | Synonyms: caravan inn, caravanserai, khan |
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| caravanserai | (noun) an inn in some eastern countries with a large courtyard that provides accommodation for caravans | Synonyms: caravan inn, caravansary, khan |
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| casava | (noun) any of several plants of the genus Manihot having fleshy roots yielding a nutritious starch | Synonyms: cassava |
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| cassava | (noun) any of several plants of the genus Manihot having fleshy roots yielding a nutritious starch | Synonyms: casava |
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| (noun) cassava root eaten as a staple food after drying and leaching; source of tapioca | Synonyms: manioc |
| (noun) a starch made by leaching and drying the root of the cassava plant; the source of tapioca; a staple food in the tropics | Synonyms: cassava starch, manioc, manioca |
| cavalcade | (noun) a procession of people traveling on horseback | - |
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| cavalier | (noun) a gallant or courtly gentleman | Synonyms: chevalier |
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| cavalla | (noun) large mackerel with long pointed snout; important food and game fish of the eastern Atlantic coast southward to Brazil | Synonyms: cero, king mackerel, Scomberomorus cavalla |
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| cavalry | (noun) a highly mobile army unit | - |
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| (noun) troops trained to fight on horseback | Synonyms: horse, horse cavalry |
| cavalryman | (noun) a soldier mounted on horseback | Synonyms: trooper |
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| (noun) a soldier in a motorized army unit | Synonyms: trooper |
| cave | (noun) a geological formation consisting of an underground enclosure with access from the surface of the ground or from the sea | - |
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| caveat | (noun) a warning against certain acts | Synonyms: caution |
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| (noun) (law) a formal notice filed with a court or officer to suspend a proceeding until filer is given a hearing | - |
| caveman | (noun) someone who lives in a cave | Synonyms: cave dweller, cave man, troglodyte |
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| cavern | (noun) a large cave or a large chamber in a cave | - |
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| (noun) any large dark enclosed space | - |
| cavetto | (noun) a concave molding shaped like a quarter circle in cross section | - |
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| caviar | (noun) salted roe of sturgeon or other large fish; usually served as an hors d'oeuvre | Synonyms: caviare |
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