| amenableness | (noun) the trait of being cooperative | Synonyms: amenability, cooperativeness |
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| amiability | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, affableness, amiableness, bonhomie, geniality |
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| (noun) a cheerful and agreeable mood | Synonyms: good humor, good humour, good temper |
| amiableness | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, affableness, amiability, bonhomie, geniality |
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| amicability | (noun) having a disposition characterized by warmth and friendliness | Synonyms: amicableness |
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| (noun) a disinclination to quarrel | Synonyms: amicableness |
| amicableness | (noun) having a disposition characterized by warmth and friendliness | Synonyms: amicability |
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| (noun) a disinclination to quarrel | Synonyms: amicability |
| aminobenzine | (noun) oily poisonous liquid amine obtained from nitrobenzene and used to make dyes and plastics and medicines | Synonyms: aniline, aniline oil, phenylamine |
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| ammobium | (noun) any plant of the genus Ammobium having yellow flowers and silvery foliage | - |
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| amobarbital | (noun) a barbiturate with sedative and hypnotic effects; used to relieve insomnia and as an anticonvulsant | - |
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| amoeba | (noun) naked freshwater or marine or parasitic protozoa that form temporary pseudopods for feeding and locomotion | Synonyms: ameba |
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| amoebiasis | (noun) infection by a disease-causing ameba | Synonyms: amebiasis, amebiosis, amoebiosis |
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| amoebiosis | (noun) infection by a disease-causing ameba | Synonyms: amebiasis, amebiosis, amoebiasis |
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| amphibia | (noun) the class of vertebrates that live on land but breed in water, frogs, toads, newts, salamanders, caecilians | Synonyms: class Amphibia |
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| amphibian | (noun) cold-blooded vertebrate typically living on land but breeding in water; aquatic larvae undergo metamorphosis into adult form | - |
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| (noun) an airplane designed to take off and land on water | Synonyms: amphibious aircraft |
| (noun) a flat-bottomed motor vehicle that can travel on land or water | Synonyms: amphibious vehicle |
| amphibole | (noun) a mineral or mineral variety belonging to the amphibole group | - |
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| amphibolite | (noun) a metamorphic rock composed chiefly of amphibole and plagioclase | - |
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| amphibology | (noun) an ambiguous grammatical construction; e.g., `they are flying planes' can mean either that someone is flying planes or that something is flying planes | Synonyms: amphiboly |
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| amphiboly | (noun) an ambiguous grammatical construction; e.g., `they are flying planes' can mean either that someone is flying planes or that something is flying planes | Synonyms: amphibology |
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| amphibrach | (noun) a metrical unit with unstressed-stressed-unstressed syllables (e.g., `remember') | - |
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| amphisbaena | (noun) (classical mythology) a serpent with a head at each end of its body | - |
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| anabiosis | (noun) suspended animation in organisms during periods of extreme drought from which they revive when moisture returns | - |
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| anabolism | (noun) the synthesis in living organisms of more complex substances (e.g., living tissue) from simpler ones together with the storage of energy | Synonyms: constructive metabolism |
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| anaerobe | (noun) an organism (especially a bacterium) that does not require air or free oxygen to live | - |
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| analbuminemia | (noun) an abnormally low level of albumin in the blood serum | - |
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| analphabet | (noun) an illiterate person who does not know the alphabet | Synonyms: analphabetic |
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| analphabetic | (noun) an illiterate person who does not know the alphabet | Synonyms: analphabet |
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| analphabetism | (noun) an inability to read | Synonyms: illiteracy |
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| androphobia | (noun) a morbid fear of men | - |
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| anglophobe | (noun) a person who hates England and everything English | - |
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| angwantibo | (noun) a kind of yellow or golden lemur (Arctocebus calabarensis) | Synonyms: Arctocebus calabarensis, golden potto |
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| anklebone | (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: astragal, astragalus, talus |
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| answerability | (noun) responsibility to someone or for some activity | Synonyms: accountability, answerableness |
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| answerableness | (noun) responsibility to someone or for some activity | Synonyms: accountability, answerability |
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| antbird | (noun) any of various dull-colored South American birds that feeding on ants some following army ant swarms | Synonyms: ant bird |
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| antechamber | (noun) a large entrance or reception room or area | Synonyms: anteroom, entrance hall, foyer, hall, lobby, vestibule |
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| antibacterial | (noun) any drug that destroys bacteria or inhibits their growth | Synonyms: antibacterial drug, bactericide |
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| antibaryon | (noun) the antiparticle of a baryon; a hadron with a baryon number of -1 | - |
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| antibiosis | (noun) an association between organisms that is harmful to one of them or between organisms and a metabolic product of another | - |
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| antibiotic | (noun) a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections | Synonyms: antibiotic drug |
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| antibody | (noun) any of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes, thus producing an immune response | - |
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| antidiabetic | (noun) a drug used to treat diabetes mellitus | Synonyms: antidiabetic drug |
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| antiestablishmentarianism | (noun) the doctrine of opposition to the social and political establishment | Synonyms: antiestablishmentism |
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| antiestablishmentism | (noun) the doctrine of opposition to the social and political establishment | Synonyms: antiestablishmentarianism |
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| antimetabolite | (noun) an antineoplastic drug that inhibits the utilization of a metabolite | - |
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| antimicrobial | (noun) an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease | Synonyms: antimicrobic, disinfectant, germicide |
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| antimicrobic | (noun) an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease | Synonyms: antimicrobial, disinfectant, germicide |
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| aplomb | (noun) great coolness and composure under strain | Synonyms: assuredness, cool, poise, sang-froid |
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| applicability | (noun) relevance by virtue of being applicable to the matter at hand | Synonyms: pertinence, pertinency |
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| approachability | (noun) the attribute of being easy to meet or deal with | Synonyms: accessibility |
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| approbation | (noun) official recognition or approval | - |
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| (noun) official approval | - |
| aquaphobia | (noun) a morbid fear of drowning | - |
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| arabesque | (noun) an ornament that interlaces simulated foliage in an intricate design | - |
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| (noun) position in which the dancer has one leg raised behind and arms outstretched in a conventional pose | - |
| arability | (noun) the quality of land that is appropriate for cultivation | - |
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| arachnophobia | (noun) a morbid fear of spiders | - |
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| arariba | (noun) Brazilian tree with handsomely marked wood | Synonyms: Centrolobium robustum |
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| araroba | (noun) a bitter yellow powder used to treat skin diseases | Synonyms: chrysarobin, Goa powder |
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| arb | (noun) someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential) | Synonyms: arbitrager, arbitrageur |
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| arbalest | (noun) late version of the crossbow with a steel bow | Synonyms: arbalist |
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| arbalist | (noun) late version of the crossbow with a steel bow | Synonyms: arbalest |
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| (noun) archer who uses an arbalest | - |
| arbiter | (noun) someone chosen to judge and decide a disputed issue | Synonyms: arbitrator, umpire |
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| (noun) someone with the power to settle matters at will | Synonyms: supreme authority |
| arbitrage | (noun) a kind of hedged investment meant to capture slight differences in price; when there is a difference in the price of something on two different markets the arbitrageur simultaneously buys at the lower price and sells at the higher price | - |
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| arbitrager | (noun) someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential) | Synonyms: arb, arbitrageur |
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| arbitrageur | (noun) someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential) | Synonyms: arb, arbitrager |
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| arbitrament | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitration, arbitrement |
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| arbitrariness | (noun) the trait of acting unpredictably and more from whim or caprice than from reason or judgment | Synonyms: capriciousness, flightiness, whimsey, whimsicality, whimsy |
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| arbitration | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitrament, arbitrement |
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| (noun) (law) the hearing and determination of a dispute by an impartial referee agreed to by both parties (often used to settle disputes between labor and management) | - |
| arbitrator | (noun) someone chosen to judge and decide a disputed issue | Synonyms: arbiter, umpire |
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| arbitrement | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitrament, arbitration |
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| arbor | (noun) a framework that supports climbing plants | Synonyms: arbour, bower, pergola |
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| (noun) any of various rotating shafts that serve as axes for larger rotating parts | Synonyms: mandrel, mandril, spindle |
| (noun) tree (as opposed to shrub) | - |
| arboretum | (noun) a facility where trees and shrubs are cultivated for exhibition | Synonyms: botanical garden |
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| arboriculture | (noun) the tending of and caring for trees | Synonyms: tree farming |
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| arboriculturist | (noun) someone trained in forestry | Synonyms: forester, tree farmer |
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| arborist | (noun) a specialist in treating damaged trees | Synonyms: tree surgeon |
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| arborolatry | (noun) the worship of trees | Synonyms: tree-worship |
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| arborvirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arbovirus |
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| arborvitae | (noun) any of several Asian and North American conifers of the genera Thuja and Thujopsis | - |
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| arbour | (noun) a framework that supports climbing plants | Synonyms: arbor, bower, pergola |
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| arbovirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arborvirus |
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| arbutus | (noun) any of several evergreen shrubs of the genus Arbutus of temperate Europe and America | - |
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| archaebacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacterium, archaeobacteria, archeobacteria |
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| archaebacterium | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaeobacteria, archeobacteria |
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| archaeobacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaebacterium, archeobacteria |
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| archbishop | (noun) a bishop of highest rank | - |
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| archbishopric | (noun) the territorial jurisdiction of an archbishop | - |
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| archeobacteria | (noun) considered ancient life forms that evolved separately from bacteria and blue-green algae | Synonyms: archaebacteria, archaebacterium, archaeobacteria |
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| ardeb | (noun) a unit of dry measure used in Egypt | - |
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| armband | (noun) a band worn around the upper arm | - |
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| (noun) worn around arm as identification or to indicate mourning | - |
| arquebus | (noun) an obsolete firearm with a long barrel | Synonyms: hackbut, hagbut, harquebus |
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| arroba | (noun) a unit of weight used in some Spanish speaking countries | - |
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| (noun) a liquid measure (with different values) used in some Spanish speaking countries | - |
| asarabacca | (noun) thick creeping evergreen herb of western Europe | Synonyms: Asarum europaeum |
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| asbestos | (noun) a fibrous amphibole; used for making fireproof articles; inhaling fibers can cause asbestosis or lung cancer | - |
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| asbestosis | (noun) lung disease caused by inhaling asbestos particles | - |
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| ashbin | (noun) a bin that holds rubbish until it is collected | Synonyms: ash-bin, ash bin, ashcan, dustbin, garbage can, trash barrel, trash bin, trash can, wastebin |
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| assailability | (noun) vulnerability to forceful attack | - |
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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 |
| 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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| assibilation | (noun) pronunciation with a sibilant (hissing or whistling) sound | Synonyms: sibilation |
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| (noun) the development of a consonant phoneme into a sibilant | - |