| aerophagia | (noun) swallowing air (usually followed by belching and discomfort and flatulence) | - |
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| aerophilately | (noun) the collection and study of airmail stamps | - |
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| aerophile | (noun) a lover of aviation | - |
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| aerophyte | (noun) plant that derives moisture and nutrients from the air and rain; usually grows on another plant but not parasitic on it | Synonyms: air plant, epiphyte, epiphytic plant |
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| aeroplane | (noun) an aircraft that has a fixed wing and is powered by propellers or jets | Synonyms: airplane, plane |
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| aerosol | (noun) a dispenser that holds a substance under pressure and that can release it as a fine spray (usually by means of a propellant gas) | Synonyms: aerosol bomb, aerosol can, aerosol container, spray can |
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| (noun) a cloud of solid or liquid particles in a gas | - |
| aerospace | (noun) the atmosphere and outer space considered as a whole | - |
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| aery | (noun) any habitation at a high altitude | Synonyms: aerie, eyrie, eyry |
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| (noun) the lofty nest of a bird of prey (such as a hawk or eagle) | Synonyms: aerie, eyrie, eyry |
| aether | (noun) a medium that was once supposed to fill all space and to support the propagation of electromagnetic waves | Synonyms: ether |
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| affair | (noun) a vaguely specified concern | Synonyms: matter, thing |
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| (noun) a formal or official social gathering or ceremony of people | Synonyms: function, occasion, social affair, social function, social gathering, social occasion |
| (noun) a usually secretive or illicit sexual relationship | Synonyms: affaire, amour, intimacy, involvement, liaison |
| affaire | (noun) a usually secretive or illicit sexual relationship | Synonyms: affair, amour, intimacy, involvement, liaison |
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| affairs | (noun) transactions of professional or public interest | - |
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| (noun) matters of personal concern | Synonyms: personal business, personal matters |
| affenpinscher | (noun) European breed of small dog resembling a terrier with dark wiry hair and a tufted muzzle | Synonyms: monkey dog, monkey pinscher |
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| afferent | (noun) a nerve that passes impulses from receptors toward or to the central nervous system | Synonyms: afferent nerve, sensory nerve |
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| affirmation | (noun) a judgment by a higher court that the judgment of a lower court was correct and should stand | - |
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| (noun) a statement asserting the existence or the truth of something | Synonyms: avouchment, avowal |
| (noun) (religion) a solemn declaration that serves the same purpose as an oath (if an oath is objectionable to the person on religious or ethical grounds) | - |
| (noun) the act of affirming or asserting or stating something | Synonyms: assertion, statement |
| affirmative | (noun) a reply of affirmation | - |
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| affirmativeness | (noun) the agreeable quality of one who assents | - |
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| affirmer | (noun) someone who claims to speak the truth | Synonyms: asserter, asseverator, avower, declarer |
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| afforestation | (noun) the conversion of bare or cultivated land into forest (originally for the purpose of hunting) | - |
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| affray | (noun) a noisy fight | Synonyms: disturbance, fray, ruffle |
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| (noun) noisy quarrel | Synonyms: altercation, fracas |
| affricate | (noun) a composite speech sound consisting of a stop and a fricative articulated at the same point (as `ch' in `chair' and `j' in `joy') | Synonyms: affricate consonant, affricative |
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| affrication | (noun) the conversion of a simple stop consonant into an affricate | - |
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| affricative | (noun) a composite speech sound consisting of a stop and a fricative articulated at the same point (as `ch' in `chair' and `j' in `joy') | Synonyms: affricate, affricate consonant |
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| affright | (noun) an overwhelming feeling of fear and anxiety | Synonyms: panic, terror |
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| affront | (noun) a deliberately offensive act or something producing the effect of deliberate disrespect | Synonyms: insult |
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| afibrinogenemia | (noun) the absence of fibrinogen in the plasma leading to prolonged bleeding | - |
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| afropavo | (noun) both sexes are brightly colored | Synonyms: Afropavo congensis, Congo peafowl |
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| afterbirth | (noun) the placenta and fetal membranes that are expelled from the uterus after the baby is born | - |
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| afterburner | (noun) a device that injects fuel into a hot exhaust for extra thrust | - |
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| aftercare | (noun) care and treatment of a convalescent patient | - |
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| afterdamp | (noun) a toxic mixture of gases (including carbon dioxide and carbon monoxide and nitrogen) after an explosion of firedamp in a mine | - |
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| afterdeck | (noun) a deck abaft of midships | - |
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| aftereffect | (noun) any result that follows its cause after an interval | - |
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| (noun) a delayed effect of a drug or therapy | - |
| afterglow | (noun) the pleasure of remembering some pleasant event | - |
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| (noun) a glow sometimes seen in the sky after sunset | - |
| afterimage | (noun) an image (usually a negative image) that persists after stimulation has ceased | Synonyms: aftersensation |
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| afterlife | (noun) life after death | Synonyms: hereafter |
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| aftermath | (noun) the outcome of an event especially as relative to an individual | Synonyms: consequence |
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| (noun) the consequences of an event (especially a catastrophic event) | Synonyms: backwash, wake |
| afternoon | (noun) a conventional expression of greeting or farewell, used to wish someone a good afternoon | Synonyms: good afternoon |
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| (noun) the part of the day between noon and evening | - |
| afterpains | (noun) pains felt by a woman after her baby is born; associated with contractions of the uterus | - |
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| afterpiece | (noun) a brief dramatic piece (usually comic) presented after a play | - |
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| afters | (noun) a dish served as the last course of a meal | Synonyms: dessert, sweet |
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| aftersensation | (noun) an image (usually a negative image) that persists after stimulation has ceased | Synonyms: afterimage |
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| aftershaft | (noun) a supplementary feather (usually small) on the underside of the base of the shaft of some feathers in some birds | - |
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| aftershock | (noun) a tremor (or one of a series of tremors) occurring after the main shock of an earthquake | - |
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| aftertaste | (noun) an afterimage of a taste | - |
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| afterthought | (noun) an addition that was not included in the original plan | - |
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| (noun) thinking again about a choice previously made | Synonyms: reconsideration, rethink, second thought |
| afterworld | (noun) the place where you are after you die | - |
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| agar | (noun) a colloidal extract of algae; used especially in culture media and as a gelling agent in foods | Synonyms: agar-agar |
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| (noun) any culture medium that uses agar as the gelling agent | Synonyms: nutrient agar |
| agaric | (noun) a saprophytic fungus of the order Agaricales having an umbrellalike cap with gills on the underside | - |
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| (noun) fungus used in the preparation of punk for fuses | Synonyms: Fomes igniarius |
| agateware | (noun) pottery that is veined and mottled to resemble agate | - |
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| agerasia | (noun) youthful appearance in an old person | - |
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| ageratum | (noun) any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers | - |
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| (noun) rhizomatous plant of central and southeastern United States and West Indies having large showy heads of clear blue flowers; sometimes placed in genus Eupatorium | Synonyms: Conoclinium coelestinum, Eupatorium coelestinum, mist-flower, mistflower |
| agglomerate | (noun) a collection of objects laid on top of each other | Synonyms: cumulation, cumulus, heap, mound, pile |
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| (noun) volcanic rock consisting of large fragments fused together | - |
| agglomeration | (noun) the act of collecting in a mass; the act of agglomerating | - |
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| (noun) a jumbled collection or mass | - |
| agglomerator | (noun) a device that causes material to gather into rounded balls | - |
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| aggrandisement | (noun) the act of increasing the wealth or prestige or power or scope of something | Synonyms: aggrandizement, elevation |
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| aggrandizement | (noun) the act of increasing the wealth or prestige or power or scope of something | Synonyms: aggrandisement, elevation |
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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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| aggregate | (noun) the whole amount | Synonyms: sum, total, totality |
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| (noun) a sum total of many heterogenous things taken together | Synonyms: congeries, conglomeration |
| (noun) material such as sand or gravel used with cement and water to make concrete, mortar, or plaster | - |
| aggregation | (noun) the act of gathering something together | Synonyms: assembling, collecting, collection |
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| (noun) several things grouped together or considered as a whole | Synonyms: accumulation, assemblage, collection |
| aggregator | (noun) a person who collects things | Synonyms: collector |
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| aggression | (noun) violent action that is hostile and usually unprovoked | Synonyms: hostility |
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| (noun) deliberately unfriendly behavior | - |
| (noun) the act of initiating hostilities | - |
| (noun) a disposition to behave aggressively | - |
| (noun) a feeling of hostility that arouses thoughts of attack | Synonyms: aggressiveness |
| aggressiveness | (noun) the quality of being bold and enterprising | - |
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| (noun) a natural disposition to be hostile | Synonyms: belligerence, pugnacity |
| (noun) a feeling of hostility that arouses thoughts of attack | Synonyms: aggression |
| aggressor | (noun) someone who attacks | Synonyms: assailant, assaulter, attacker |
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| (noun) a confident assertive person who acts as instigator | - |
| aggro | (noun) (informal British usage) aggravation or aggression | - |
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| agitator | (noun) one who agitates; a political troublemaker | Synonyms: fomenter |
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| agitprop | (noun) political propaganda (especially communist propaganda) communicated via art and literature and cinema | - |
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| agora | (noun) 100 agorot equal 1 shekel in Israel | - |
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| (noun) a place of assembly for the people in ancient Greece | Synonyms: public square |
| (noun) the marketplace in ancient Greece | - |
| agoraphobia | (noun) a morbid fear of open spaces (as fear of being caught alone in some public place) | - |
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| agranulocytosis | (noun) an acute blood disorder (often caused by radiation or drug therapy) characterized by severe reduction in granulocytes | Synonyms: agranulosis, granulocytopenia |
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| agranulosis | (noun) an acute blood disorder (often caused by radiation or drug therapy) characterized by severe reduction in granulocytes | Synonyms: agranulocytosis, granulocytopenia |
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| agrapha | (noun) sayings of Jesus not recorded in the canonical Gospels | - |
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| agraphia | (noun) a loss of the ability to write or to express thoughts in writing because of a brain lesion | Synonyms: anorthography, logagraphia |
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| agraphon | (noun) (usually plural) a saying of Jesus not in the canonical gospels but found in other New Testament or early Christian writings. | - |
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| agreeability | (noun) a temperamental disposition to be agreeable | Synonyms: agreeableness |
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| agreeableness | (noun) a temperamental disposition to be agreeable | Synonyms: agreeability |
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| (noun) pleasantness resulting from agreeable conditions | Synonyms: amenity |
| agreement | (noun) compatibility of observations | Synonyms: correspondence |
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| (noun) the thing arranged or agreed to | Synonyms: arrangement |
| (noun) the verbal act of agreeing | - |
| (noun) the statement (oral or written) of an exchange of promises | Synonyms: understanding |
| (noun) the determination of grammatical inflection on the basis of word relations | Synonyms: concord |
| (noun) harmony of people's opinions or actions or characters | Synonyms: accord |
| agribusiness | (noun) a large-scale farming enterprise | Synonyms: agriculture, factory farm |
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| agriculturalist | (noun) someone concerned with the science or art or business of cultivating the soil | Synonyms: agriculturist, cultivator, grower, raiser |
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| agriculture | (noun) the practice of cultivating the land or raising stock | Synonyms: farming, husbandry |
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| (noun) a large-scale farming enterprise | Synonyms: agribusiness, factory farm |
| (noun) the class of people engaged in growing food | - |
| agriculturist | (noun) someone concerned with the science or art or business of cultivating the soil | Synonyms: agriculturalist, cultivator, grower, raiser |
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| agrimonia | (noun) a plant of the genus Agrimonia having spikelike clusters of small yellow flowers | Synonyms: agrimony |
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| agrimony | (noun) a plant of the genus Agrimonia having spikelike clusters of small yellow flowers | Synonyms: agrimonia |
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| agrobiology | (noun) the study of plant nutrition and growth especially as a way to increase crop yield | - |
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| agrology | (noun) science of soils in relation to crops | - |
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| agromania | (noun) an intense desire to be alone or out in the open | - |
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| agronomist | (noun) an expert in soil management and field-crop production | - |
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| agronomy | (noun) the application of soil and plant sciences to land management and crop production | Synonyms: scientific agriculture |
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| agrypnia | (noun) a vigil before certain feasts (as e.g. Easter) | - |
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| aigret | (noun) a long plume (especially one of egret feathers) worn on a hat or a piece of jewelry in the shape of a plume | Synonyms: aigrette |
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| aigrette | (noun) a long plume (especially one of egret feathers) worn on a hat or a piece of jewelry in the shape of a plume | Synonyms: aigret |
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| aileron | (noun) an airfoil that controls lateral motion | - |
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| ailurophobia | (noun) a morbid fear of cats | - |
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| air | (noun) travel via aircraft | Synonyms: air travel, aviation |
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| (noun) a distinctive but intangible quality surrounding a person or thing | Synonyms: atmosphere, aura |
| (noun) a succession of notes forming a distinctive sequence | Synonyms: line, melodic line, melodic phrase, melody, strain, tune |
| (noun) medium for radio and television broadcasting | Synonyms: airwave |
| (noun) the region above the ground | - |
| (noun) the mass of air surrounding the Earth | Synonyms: atmosphere |
| (noun) a slight wind (usually refreshing) | Synonyms: breeze, gentle wind, zephyr |
| (noun) a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of | - |
| (noun) once thought to be one of four elements composing the universe (Empedocles), associated with the humour blood | - |
| airbrake | (noun) a vehicular brake that operates by compressed air; especially for heavy vehicles | - |
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| (noun) a small parachute or articulated flap to reduce the speed of an aircraft | Synonyms: dive brake |
| airbrush | (noun) an atomizer to spray paint by means of compressed air | - |
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| airburst | (noun) an explosion in the atmosphere | - |
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| airbus | (noun) a subsonic jet airliner operated over short distances | - |
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| aircraft | (noun) a vehicle that can fly | - |
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