| affirmativeness | (noun) the agreeable quality of one who assents | - |
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| affixation | (noun) formation of a word by means of an affix | - |
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| (noun) the act of attaching or affixing something | Synonyms: attachment |
| (noun) the result of adding an affix to a root word | - |
| afflatus | (noun) a strong creative impulse; divine inspiration | - |
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| affliction | (noun) a cause of great suffering and distress | - |
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| (noun) a condition of suffering or distress due to ill health | - |
| (noun) a state of great suffering and distress due to adversity | - |
| affluent | (noun) a branch that flows into the main stream | Synonyms: confluent, feeder, tributary |
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| (noun) an affluent person; a person who is financially well off | - |
| afforestation | (noun) the conversion of bare or cultivated land into forest (originally for the purpose of hunting) | - |
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| 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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| aflatoxin | (noun) a potent carcinogen from the fungus Aspergillus; can be produced and stored for use as a bioweapon | - |
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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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| agalactia | (noun) a condition in which milk is not secreted in the mother's breasts after her child has been delivered | Synonyms: agalactosis |
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| agalactosis | (noun) a condition in which milk is not secreted in the mother's breasts after her child has been delivered | Synonyms: agalactia |
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| agamete | (noun) an asexual reproductive cell | - |
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| agapanthus | (noun) any of various plants of the genus Agapanthus having umbels of showy blue to purple flowers | Synonyms: lily of the Nile |
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| agate | (noun) an impure form of quartz consisting of banded chalcedony; used as a gemstone and for making mortars and pestles | - |
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| agateware | (noun) pottery that is veined and mottled to resemble agate | - |
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| agent | (noun) the semantic role of the animate entity that instigates or causes the happening denoted by the verb in the clause | Synonyms: agentive role |
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| (noun) an active and efficient cause; capable of producing a certain effect | - |
| (noun) a businessman who buys or sells for another in exchange for a commission | Synonyms: broker, factor |
| (noun) a representative who acts on behalf of other persons or organizations | - |
| (noun) any agent or representative of a federal agency or bureau | Synonyms: federal agent |
| (noun) a substance that exerts some force or effect | - |
| 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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| agglutination | (noun) the building of words from component morphemes that retain their form and meaning in the process of combining | - |
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| (noun) a clumping of bacteria or red cells when held together by antibodies (agglutinins) | - |
| (noun) the coalescing of small particles that are suspended in solution; these larger masses are then (usually) precipitated | Synonyms: agglutinating activity |
| agglutinin | (noun) an antibody that causes agglutination of a specific antigen | - |
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| agglutinogen | (noun) any substance that acts as an antigen to cause agglutinin production | - |
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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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| agility | (noun) the gracefulness of a person or animal that is quick and nimble | Synonyms: legerity, lightness, lightsomeness, nimbleness |
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| agiotage | (noun) a fee charged for exchanging currencies | Synonyms: agio, exchange premium, premium |
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| (noun) speculative dealing in stock exchange securities or foreign exchange. | - |
| agitation | (noun) disturbance usually in protest | Synonyms: excitement, hullabaloo, turmoil, upheaval |
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| (noun) the act of agitating something; causing it to move around (usually vigorously) | - |
| (noun) the feeling of being agitated; not calm | - |
| (noun) a state of agitation or turbulent change or development | Synonyms: ferment, fermentation, tempestuousness, unrest |
| (noun) a mental state of extreme emotional disturbance | - |
| 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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| aglet | (noun) ornamental tagged cord or braid on the shoulder of a uniform | Synonyms: aiglet, aiguillette |
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| (noun) metal or plastic sheath over the end of a shoelace or ribbon | Synonyms: aiglet |
| agnate | (noun) one related on the father's side | Synonyms: patrikin, patrilineal kin, patrilineal sib, patrisib |
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| agnathan | (noun) eel-shaped vertebrate without jaws or paired appendages including the cyclostomes and some extinct forms | Synonyms: jawless fish, jawless vertebrate |
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| agnation | (noun) line of descent traced through the paternal side of the family | Synonyms: patrilineage |
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| agnostic | (noun) a person who claims that they cannot have true knowledge about the existence of God (but does not deny that God might exist) | - |
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| (noun) someone who is doubtful or noncommittal about something | Synonyms: doubter |
| agnosticism | (noun) the disbelief in any claims of ultimate knowledge | Synonyms: scepticism, skepticism |
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| (noun) a religious orientation of doubt; a denial of ultimate knowledge of the existence of God | - |
| agonist | (noun) (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction | - |
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| (noun) a muscle that contracts while another relaxes | - |
| (noun) someone involved in a contest or battle (as in an agon) | - |
| (noun) the principal character in a work of fiction | Synonyms: protagonist |
| agouti | (noun) agile long-legged rabbit-sized rodent of Central America and South America and the West Indies; valued as food | Synonyms: Dasyprocta aguti |
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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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| agreeability | (noun) a temperamental disposition to be agreeable | Synonyms: agreeableness |
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| 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 |
| 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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| agronomist | (noun) an expert in soil management and field-crop production | - |
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| aguacate | (noun) a pear-shaped tropical fruit with green or blackish skin and rich yellowish pulp enclosing a single large seed | Synonyms: alligator pear, avocado, avocado pear |
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| aiglet | (noun) ornamental tagged cord or braid on the shoulder of a uniform | Synonyms: aglet, aiguillette |
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| (noun) metal or plastic sheath over the end of a shoelace or ribbon | Synonyms: aglet |
| 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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| aiguillette | (noun) ornamental tagged cord or braid on the shoulder of a uniform | Synonyms: aglet, aiglet |
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| ailanthus | (noun) any of several deciduous Asian trees of the genus Ailanthus | - |
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| ailment | (noun) an often persistent bodily disorder or disease; a cause for complaining | Synonyms: complaint, ill |
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| airburst | (noun) an explosion in the atmosphere | - |
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| aircraft | (noun) a vehicle that can fly | - |
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| aircraftman | (noun) a noncommissioned officer in the British Royal Air Force | Synonyms: aircraftsman |
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| aircraftsman | (noun) a noncommissioned officer in the British Royal Air Force | Synonyms: aircraftman |
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| airlift | (noun) transportation of people or goods by air (especially when other means of access are unavailable) | Synonyms: lift |
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| airport | (noun) an airfield equipped with control tower and hangars as well as accommodations for passengers and cargo | Synonyms: aerodrome, airdrome, drome |
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| airpost | (noun) a system of conveying mail by aircraft | Synonyms: airmail |
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| airstream | (noun) a relatively well-defined prevailing wind | - |
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| (noun) the flow of air that is driven backwards by an aircraft propeller | Synonyms: backwash, race, slipstream, wash |
| airstrip | (noun) an airfield without normal airport facilities | Synonyms: flight strip, landing strip, strip |
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| airworthiness | (noun) fitness to fly | - |
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| aitchbone | (noun) a cut of beef including the H-shaped rump bone | - |
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| akaryocyte | (noun) a cell without a nucleus (as an erythrocyte) | Synonyms: acaryote, akaryote |
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| akaryote | (noun) a cell without a nucleus (as an erythrocyte) | Synonyms: acaryote, akaryocyte |
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| akvavit | (noun) Scandinavian liquor usually flavored with caraway seeds | Synonyms: aquavit |
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| alabaster | (noun) a very light white | - |
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| (noun) a compact fine-textured, usually white gypsum used for carving | - |
| (noun) a hard compact kind of calcite | Synonyms: Mexican onyx, onyx marble, oriental alabaster |
| alacrity | (noun) liveliness and eagerness | Synonyms: briskness, smartness |
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| alarmist | (noun) a person who alarms others needlessly | - |
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| alastrim | (noun) a mild form of smallpox caused by a less virulent form of the virus | Synonyms: Cuban itch, Kaffir pox, milk pox, pseudosmallpox, pseudovariola, variola minor, West Indian smallpox, white pox |
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| albatross | (noun) large web-footed birds of the Southern Hemisphere having long narrow wings; noted for powerful gliding flight | Synonyms: mollymawk |
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| (noun) (figurative) something that hinders or handicaps | Synonyms: millstone |
| albite | (noun) a widely distributed feldspar that forms rocks | Synonyms: white feldspar |
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