| aristocracy | (noun) a privileged class holding hereditary titles | Synonyms: nobility |
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| (noun) the most powerful members of a society | Synonyms: gentry |
| arithmancy | (noun) divination by means of numbers | - |
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| arity | (noun) the number of arguments that a function can take | - |
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| armory | (noun) a place where arms are manufactured | Synonyms: armoury, arsenal |
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| (noun) a military structure where arms and ammunition and other military equipment are stored and training is given in the use of arms | Synonyms: armoury, arsenal |
| (noun) all the weapons and equipment that a country has | Synonyms: armoury, arsenal |
| (noun) a collection of resources | Synonyms: armoury, inventory |
| armoury | (noun) a place where arms are manufactured | Synonyms: armory, arsenal |
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| (noun) a military structure where arms and ammunition and other military equipment are stored and training is given in the use of arms | Synonyms: armory, arsenal |
| (noun) all the weapons and equipment that a country has | Synonyms: armory, arsenal |
| (noun) a collection of resources | Synonyms: armory, inventory |
| army | (noun) a permanent organization of the military land forces of a nation or state | Synonyms: ground forces, regular army |
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| (noun) a large number of people united for some specific purpose | - |
| aromatherapy | (noun) the therapeutic use of aromatic plant extracts and essential oils in baths or massage | - |
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| aromaticity | (noun) The property of having an aroma. | - |
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| array | (noun) an arrangement of aerials spaced to give desired directional characteristics | - |
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| (noun) especially fine or decorative clothing | Synonyms: raiment, regalia |
| (noun) an impressive display | - |
| (noun) an orderly arrangement | - |
| arteriography | (noun) roentgenographic examination of arteries | - |
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| artery | (noun) a major thoroughfare that bears important traffic | - |
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| (noun) a blood vessel that carries blood from the heart to the body | Synonyms: arteria, arterial blood vessel |
| arthrography | (noun) roentgenographic examination of a joint after injection of radiopaque contrast medium; produces an arthrogram | - |
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| arthropathy | (noun) a pathology or abnormality of a joint | - |
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| arthroplasty | (noun) surgical reconstruction or replacement of a malformed or degenerated joint | - |
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| arthroscopy | (noun) a minimally invasive operation to repair a damaged joint; the surgeon examines the joint with an arthroscope while making repairs through a small incision | - |
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| artificiality | (noun) the quality of being produced by people and not occurring naturally | - |
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| artillery | (noun) large but transportable armament | Synonyms: gun, heavy weapon, ordnance |
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| (noun) a means of persuading or arguing | Synonyms: weapon |
| (noun) an army unit that uses big guns | Synonyms: artillery unit |
| artistry | (noun) a superior skill that you can learn by study and practice and observation | Synonyms: art, prowess |
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| ascendancy | (noun) the state that exists when one person or group has power over another | Synonyms: ascendance, ascendence, ascendency, control, dominance |
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| ascendency | (noun) the state that exists when one person or group has power over another | Synonyms: ascendance, ascendancy, ascendence, control, dominance |
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| asexuality | (noun) having no evident sex or sex organs | Synonyms: sexlessness |
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| ashtray | (noun) a receptacle for the ash from smokers' cigars or cigarettes | - |
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| asininity | (noun) the quality of being asinine; stupidity combined with stubbornness | - |
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| asperity | (noun) something hard to endure | Synonyms: grimness, hardship, rigor, rigorousness, rigour, rigourousness, severeness, severity |
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| (noun) harshness of manner | Synonyms: sharpness |
| assailability | (noun) vulnerability to forceful attack | - |
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| assay | (noun) a quantitative or qualitative test of a substance (especially an ore or a drug) to determine its components; frequently used to test for the presence or concentration of infectious agents or antibodies etc. | - |
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| (noun) an appraisal of the state of affairs | Synonyms: check |
| (noun) a written report of the results of an analysis of the composition of some substance | - |
| (noun) a substance that is undergoing an analysis of its components | - |
| 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 | - |
| assiduity | (noun) great and constant diligence and attention | Synonyms: assiduousness, concentration |
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| assimilability | (noun) Capability of being taken in and utilized as nourishment. | - |
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| associability | (noun) the capability of being easily associated or joined or connected in thought | Synonyms: associableness |
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| astheny | (noun) an abnormal loss of strength | Synonyms: asthenia |
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| astringency | (noun) the ability to contract or draw together soft body tissues to check blood flow or restrict secretion of fluids | Synonyms: stypsis |
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| (noun) a sharp astringent taste; the taste experience when a substance causes the mouth to pucker | Synonyms: astringence |
| astrobiology | (noun) the branch of biology concerned with the effects of outer space on living organisms and the search for extraterrestrial life | Synonyms: exobiology, space biology |
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| astrolatry | (noun) the worship of planets or stars | Synonyms: worship of heavenly bodies |
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| astrology | (noun) a pseudoscience claiming divination by the positions of the planets and sun and moon | Synonyms: star divination |
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| astrometry | (noun) the branch of astronomy that deals with the measurement of the position and motion of celestial bodies | - |
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| astronomy | (noun) the branch of physics that studies celestial bodies and the universe as a whole | Synonyms: uranology |
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| asymmetry | (noun) (mathematics) a lack of symmetry | - |
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| asynchrony | (noun) the relation that exists when things occur at unrelated times | Synonyms: asynchronism, desynchronisation, desynchronization, desynchronizing |
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| asynergy | (noun) absence of coordination of organs or body parts that usually work together harmoniously | Synonyms: asynergia |
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| ataxy | (noun) inability to coordinate voluntary muscle movements; unsteady movements and staggering gait | Synonyms: ataxia, dyssynergia, motor ataxia |
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| atonality | (noun) the absence of a key; alternative to the diatonic system | Synonyms: atonalism |
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| atonicity | (noun) lack of normal muscular tension or tonus | Synonyms: amyotonia, atonia, atony |
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| atony | (noun) lack of normal muscular tension or tonus | Synonyms: amyotonia, atonia, atonicity |
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| atopy | (noun) an allergic reaction that becomes apparent in a sensitized person only minutes after contact | Synonyms: atopic allergy, immediate allergy, type I allergic reaction |
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| atrocity | (noun) an act of atrocious cruelty | Synonyms: inhumanity |
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| (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrociousness, barbarity, barbarousness, heinousness |
| atrophy | (noun) any weakening or degeneration (especially through lack of use) | Synonyms: withering |
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| (noun) a decrease in size of an organ caused by disease or disuse | Synonyms: wasting, wasting away |
| attainability | (noun) the state of being achievable | Synonyms: achievability, attainableness |
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| attorney | (noun) a professional person authorized to practice law; conducts lawsuits or gives legal advice | Synonyms: lawyer |
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| atypicality | (noun) any state that is not typical | Synonyms: untypicality |
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| audacity | (noun) fearless daring | Synonyms: audaciousness, temerity |
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| (noun) aggressive boldness or unmitigated effrontery | Synonyms: audaciousness |
| audibility | (noun) quality or fact or degree of being audible or perceptible by the ear | Synonyms: audibleness |
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| audiology | (noun) the measurement of hearing | Synonyms: audiometry |
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| audiometry | (noun) measuring sensitivity of hearing | - |
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| (noun) the measurement of hearing | Synonyms: audiology |
| augury | (noun) an event that is experienced as indicating important things to come | Synonyms: foretoken, preindication, sign |
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| aunty | (noun) the sister of your father or mother; the wife of your uncle | Synonyms: aunt, auntie |
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| austerity | (noun) the trait of great self-denial (especially refraining from worldly pleasures) | Synonyms: asceticism, nonindulgence |
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| autarchy | (noun) a political system governed by a single individual | Synonyms: autocracy |
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| (noun) economic independence as a national policy | Synonyms: autarky |
| autarky | (noun) economic independence as a national policy | Synonyms: autarchy |
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| authenticity | (noun) undisputed credibility | Synonyms: genuineness, legitimacy |
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| authority | (noun) the power or right to give orders or make decisions | Synonyms: authorisation, authorization, dominance, potency, say-so |
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| (noun) official permission or approval | Synonyms: authorisation, authorization, sanction |
| (noun) freedom from doubt; belief in yourself and your abilities | Synonyms: assurance, confidence, self-assurance, self-confidence, sureness |
| (noun) an authoritative written work | - |
| (noun) an administrative unit of government | Synonyms: agency, bureau, federal agency, government agency, office |
| (noun) an expert whose views are taken as definitive | - |
| (noun) (usually plural) persons who exercise (administrative) control over others | - |
| autoantibody | (noun) an antibody acting against tissues of the organism that produces it | - |
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| autobiography | (noun) a biography of yourself | - |
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| autochthony | (noun) nativeness by virtue of originating or occurring naturally (as in a particular place) | Synonyms: endemism, indigenousness |
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| autocracy | (noun) a political theory favoring unlimited authority by a single individual | - |
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| (noun) a political system governed by a single individual | Synonyms: autarchy |
| autogamy | (noun) self-fertilization in plants | - |
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| autogeny | (noun) a hypothetical organic phenomenon by which living organisms are created from nonliving matter | Synonyms: abiogenesis, autogenesis, spontaneous generation |
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| autoimmunity | (noun) production of antibodies against the tissues of your own body; produces autoimmune disease or hypersensitivity reactions | - |
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| autolatry | (noun) the worship of yourself | Synonyms: idiolatry, self-worship |
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| autonomy | (noun) immunity from arbitrary exercise of authority: political independence | Synonyms: liberty |
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| (noun) personal independence | Synonyms: self-direction, self-reliance, self-sufficiency |
| autoplasty | (noun) surgical repair by using tissue from another part of the patient's own body | - |
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| (noun) tissue that is taken from one site and grafted to another site on the same person | Synonyms: autograft |
| autopsy | (noun) an examination and dissection of a dead body to determine cause of death or the changes produced by disease | Synonyms: necropsy, PM, post-mortem, post-mortem examination, postmortem, postmortem examination |
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| autoradiography | (noun) producing a radiograph by means of the radiation emitted from the specimen being photographed | - |
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| autotomy | (noun) spontaneous removal or casting off of a body part (as the tail of a lizard or claw of a lobster) especially when the organism is injured or under attack | - |
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| autotypy | (noun) process for producing permanent prints in a carbon pigment | Synonyms: autotype |
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| auxiliary | (noun) someone who acts as assistant | Synonyms: aide |
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| availability | (noun) the quality of being at hand when needed | Synonyms: accessibility, availableness, handiness |
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| aviary | (noun) a building where birds are kept | Synonyms: bird sanctuary, volary |
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| avidity | (noun) a positive feeling of wanting to push ahead with something | Synonyms: avidness, eagerness, keenness |
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| axiology | (noun) the study of values and value judgments | - |
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| baby | (noun) a project of personal concern to someone | - |
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| (noun) a very young mammal | - |
| (noun) a very young child (birth to 1 year) who has not yet begun to walk or talk | Synonyms: babe, infant |
| (noun) the youngest member of a group (not necessarily young) | - |
| (noun) an immature childish person | Synonyms: child |
| (noun) an unborn child; a human fetus | - |
| (noun) a beloved person; used as terms of endearment | Synonyms: beloved, darling, dear, dearest, dearie, deary, honey, love, sweetheart, sweetie |
| baccy | (noun) leaves of the tobacco plant dried and prepared for smoking or ingestion | Synonyms: tobacco |
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| backstay | (noun) a stay that supports the back of something | - |
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| bacteriology | (noun) the branch of medical science that studies bacteria in relation to disease | - |
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| bailey | (noun) the outer defensive wall that surrounds the outer courtyard of a castle | - |
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| (noun) the outer courtyard of a castle | - |
| bakery | (noun) a workplace where baked goods (breads and cakes and pastries) are produced or sold | Synonyms: bakehouse, bakeshop |
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| balcony | (noun) a platform projecting from the wall of a building and surrounded by a balustrade or railing or parapet | - |
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| (noun) an upper floor projecting from the rear over the main floor in an auditorium | - |
| baldy | (noun) a person whose head is bald or shaved | Synonyms: baldhead, baldpate, skin, skinhead |
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| baloney | (noun) pretentious or silly talk or writing | Synonyms: bilgewater, boloney, bosh, drool, humbug, taradiddle, tarradiddle, tommyrot, tosh, twaddle |
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| banality | (noun) a trite or obvious remark | Synonyms: bromide, cliche, commonplace, platitude |
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| banditry | (noun) the practice of plundering in gangs | - |
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| baneberry | (noun) a plant of the genus Actaea having acrid poisonous berries | Synonyms: cohosh, herb Christopher |
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| (noun) a poisonous berry of a plant of the genus Actaea | - |
| bankruptcy | (noun) a legal process intended to insure equality among the creditors of a corporation declared to be insolvent | - |
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| (noun) inability to discharge all your debts as they come due | Synonyms: failure |
| (noun) a state of complete lack of some abstract property | - |
| baptistery | (noun) bowl for baptismal water | Synonyms: baptismal font, baptistry, font |
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| baptistry | (noun) bowl for baptismal water | Synonyms: baptismal font, baptistery, font |
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| barbarity | (noun) a brutal barbarous savage act | Synonyms: barbarism, brutality, savagery |
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| (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrociousness, atrocity, barbarousness, heinousness |
| barberry | (noun) any of numerous plants of the genus Berberis having prickly stems and yellow flowers followed by small red berries | - |
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| bardolatry | (noun) the idolization of William Shakespeare | - |
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| barley | (noun) a grain of barley | Synonyms: barleycorn |
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| (noun) cultivated since prehistoric times; grown for forage and grain | - |
| baronetcy | (noun) the title of a baron | - |
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| (noun) the rank or dignity or position of a baronet or baroness | Synonyms: barony |