| archives | (noun) collection of records especially about an institution | - |
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| archivist | (noun) a person in charge of collecting and cataloguing archives | - |
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| archness | (noun) inappropriate playfulness | Synonyms: impertinence, perkiness, pertness, sauciness |
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| archosaur | (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaurian, archosaurian reptile |
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| archosaurian | (noun) extinct reptiles including: dinosaurs, plesiosaurs, pterosaurs, ichthyosaurs, thecodonts | Synonyms: archosaur, archosaurian reptile |
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| archpriest | (noun) a senior clergyman and dignitary | Synonyms: hierarch, high priest, prelate, primate |
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| archway | (noun) a passageway under a curved masonry construction | Synonyms: arch |
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| arcminute | (noun) a unit of angular distance equal to a 60th of a degree | Synonyms: minute, minute of arc |
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| arcsec | (noun) the inverse function of the secant; the angle that has a secant equal to a given number | Synonyms: arc secant, arcsecant, inverse secant |
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| arcsecant | (noun) the inverse function of the secant; the angle that has a secant equal to a given number | Synonyms: arc secant, arcsec, inverse secant |
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| arcsecond | (noun) a 60th part of a minute of arc | Synonyms: second |
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| arcsin | (noun) the inverse function of the sine; the angle that has a sine equal to a given number | Synonyms: arc sine, arcsine, inverse sine |
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| arcsine | (noun) the inverse function of the sine; the angle that has a sine equal to a given number | Synonyms: arc sine, arcsin, inverse sine |
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| arctan | (noun) the inverse function of the tangent; the angle that has a tangent equal to a given number | Synonyms: arc tangent, arctangent, inverse tangent |
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| arctangent | (noun) the inverse function of the tangent; the angle that has a tangent equal to a given number | Synonyms: arc tangent, arctan, inverse tangent |
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| arctic | (noun) a waterproof overshoe that protects shoes from water or snow | Synonyms: galosh, golosh, gumshoe, rubber |
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| arctiid | (noun) stout-bodied broad-winged moth with conspicuously striped or spotted wings; larvae are hairy caterpillars | Synonyms: arctiid moth |
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| arcus | (noun) a whitish deposit in the shape of an arc that is sometimes seen in the cornea | Synonyms: arcus senilis |
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| areca | (noun) any of several tall tropical palms native to southeastern Asia having egg-shaped nuts | - |
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| aristocracy | (noun) a privileged class holding hereditary titles | Synonyms: nobility |
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| (noun) the most powerful members of a society | Synonyms: gentry |
| aristocrat | (noun) a member of the aristocracy | Synonyms: blue blood, patrician |
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| aristocratism | (noun) the principles, practices or characteristics of aristocracy. | - |
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| arithmancy | (noun) divination by means of numbers | - |
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| arithmetic | (noun) the branch of pure mathematics dealing with the theory of numerical calculations | - |
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| arithmetician | (noun) someone who specializes in arithmetic | - |
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| armchair | (noun) chair with a support on each side for arms | - |
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| armistice | (noun) a state of peace agreed to between opponents so they can discuss peace terms | Synonyms: cease-fire, truce |
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| arnica | (noun) an ointment used in treating bruises | - |
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| (noun) any of various rhizomatous usually perennial plants of the genus Arnica | - |
| (noun) used especially in treating bruises | - |
| aromaticity | (noun) The property of having an aroma. | - |
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| arrack | (noun) any of various strong liquors distilled from the fermented sap of toddy palms or from fermented molasses | Synonyms: arak |
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| arrivederci | (noun) a farewell remark | Synonyms: adieu, adios, au revoir, auf wiedersehen, bye-bye, bye, cheerio, good-by, good-bye, good day, goodby, goodbye, sayonara, so long |
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| arrogance | (noun) overbearing pride evidenced by a superior manner toward inferiors | Synonyms: haughtiness, hauteur, high-handedness, lordliness |
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| arsenic | (noun) a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and in various alloys; found in arsenopyrite and orpiment and realgar | Synonyms: As, atomic number 33 |
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| (noun) a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer | Synonyms: arsenic trioxide, arsenous anhydride, arsenous oxide, ratsbane, white arsenic |
| arsenical | (noun) a pesticide or drug containing arsenic | - |
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| artefact | (noun) a man-made object taken as a whole | Synonyms: artifact |
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| arteriectasia | (noun) an abnormal distension of an artery | Synonyms: arteriectasis |
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| arteriectasis | (noun) an abnormal distension of an artery | Synonyms: arteriectasia |
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| arteriolosclerosis | (noun) sclerosis of the arterioles | - |
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| arteriosclerosis | (noun) sclerosis of the arterial walls | Synonyms: arterial sclerosis, coronary-artery disease, hardening of the arteries, induration of the arteries |
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| arthritic | (noun) a person afflicted with arthritis | - |
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| arthrocentesis | (noun) removal of fluid from a joint by centesis | - |
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| arthroscope | (noun) a type of endoscope that is inserted into a joint for visual examination | - |
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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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| artichoke | (noun) a thistlelike flower head with edible fleshy leaves and heart | Synonyms: globe artichoke |
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| (noun) Mediterranean thistlelike plant widely cultivated for its large edible flower head | Synonyms: artichoke plant, Cynara scolymus, globe artichoke |
| article | (noun) one of a class of artifacts | - |
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| (noun) nonfictional prose forming an independent part of a publication | - |
| (noun) (grammar) a determiner that may indicate the specificity of reference of a noun phrase | - |
| (noun) a separate section of a legal document (as a statute or contract or will) | Synonyms: clause |
| articulateness | (noun) the quality of being facile in speech and writing | Synonyms: fluency, volubility |
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| articulatio | (noun) (anatomy) the point of connection between two bones or elements of a skeleton (especially if it allows motion) | Synonyms: articulation, joint |
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| articulation | (noun) the act of joining things in such a way that motion is possible | - |
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| (noun) (anatomy) the point of connection between two bones or elements of a skeleton (especially if it allows motion) | Synonyms: articulatio, joint |
| (noun) the aspect of pronunciation that involves bringing articulatory organs together so as to shape the sounds of speech | - |
| (noun) expressing in coherent verbal form | Synonyms: voice |
| (noun) the shape or manner in which things come together and a connection is made | Synonyms: join, joint, junction, juncture |
| articulator | (noun) a movable speech organ | - |
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| (noun) someone who pronounces words | - |
| artifact | (noun) a man-made object taken as a whole | Synonyms: artefact |
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| artifice | (noun) a deceptive maneuver (especially to avoid capture) | Synonyms: ruse |
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| artificer | (noun) a skilled worker who practices some trade or handicraft | Synonyms: artisan, craftsman, journeyman |
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| (noun) someone who is the first to think of or make something | Synonyms: discoverer, inventor |
| (noun) an enlisted man responsible for the upkeep of small arms and machine guns etc. | Synonyms: armorer, armourer |
| artificialism | (noun) Czech surrealism founded in 1928 by Jindrich Styrsky and Toyen (Marie Cerminova). | - |
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| artificiality | (noun) the quality of being produced by people and not occurring naturally | - |
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| artiodactyl | (noun) placental mammal having hooves with an even number of functional toes on each foot | Synonyms: artiodactyl mammal, even-toed ungulate |
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| asarabacca | (noun) thick creeping evergreen herb of western Europe | Synonyms: Asarum europaeum |
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| ascariasis | (noun) infestation of the human intestine with Ascaris roundworms | - |
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| ascendance | (noun) the state that exists when one person or group has power over another | Synonyms: ascendancy, ascendence, ascendency, control, dominance |
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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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| ascendant | (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: ancestor, antecedent, ascendent, root |
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| (noun) position or state of being dominant or in control | Synonyms: ascendent |
| ascendence | (noun) the state that exists when one person or group has power over another | Synonyms: ascendance, ascendancy, 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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| ascendent | (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: ancestor, antecedent, ascendant, root |
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| (noun) position or state of being dominant or in control | Synonyms: ascendant |
| ascender | (noun) (printing) the part of tall lowercase letters that extends above the other lowercase letters | - |
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| (noun) a lowercase letter that has a part extending above other lowercase letters | - |
| (noun) someone who ascends | - |
| ascending | (noun) the act of changing location in an upward direction | Synonyms: ascension, ascent, rise |
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| ascension | (noun) the act of changing location in an upward direction | Synonyms: ascending, ascent, rise |
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| (noun) a movement upward; rise above the ground | Synonyms: ascent, rise, rising |
| (noun) (astronomy) the rising of a star above the horizon | - |
| ascent | (noun) the act of changing location in an upward direction | Synonyms: ascending, ascension, rise |
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| (noun) a movement upward; rise above the ground | Synonyms: ascension, rise, rising |
| (noun) an upward slope or grade (as in a road) | Synonyms: acclivity, climb, raise, rise, upgrade |
| ascesis | (noun) rigorous self-denial and active self-restraint | Synonyms: asceticism |
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| ascetic | (noun) someone who practices self denial as a spiritual discipline | Synonyms: abstainer |
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| asceticism | (noun) rigorous self-denial and active self-restraint | Synonyms: ascesis |
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| (noun) the trait of great self-denial (especially refraining from worldly pleasures) | Synonyms: austerity, nonindulgence |
| (noun) the doctrine that through renunciation of worldly pleasures it is possible to achieve a high spiritual or intellectual state | - |
| ascidian | (noun) minute sedentary marine invertebrate having a saclike body with siphons through which water enters and leaves | - |
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| ascites | (noun) accumulation of serous fluid in peritoneal cavity | - |
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| asclepiad | (noun) any plant of the family Asclepiadaceae | - |
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| ascocarp | (noun) mature fruiting body of an ascomycetous fungus | - |
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| ascolichen | (noun) a lichen in which the fungus component is an ascomycete | - |
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| ascoma | (noun) an ascocarp having the spore-bearing layer of cells (the hymenium) on a broad disklike receptacle | - |
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| ascomycete | (noun) any fungus of the class Ascomycetes (or subdivision Ascomycota) in which the spores are formed inside an ascus | Synonyms: ascomycetous fungus |
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| ascospore | (noun) sexually produced fungal spore formed within an ascus | - |
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| ascot | (noun) a cravat with wide square ends; secured with an ornamental pin | - |
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| ascription | (noun) assigning to a cause or source | Synonyms: attribution |
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| (noun) assigning some quality or character to a person or thing | Synonyms: attribution |
| ascus | (noun) saclike structure in which ascospores are formed through sexual reproduction of ascomycetes | - |
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| asdic | (noun) a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return | Synonyms: echo sounder, sonar |
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| ashcake | (noun) corn bread wrapped in cabbage leaves and baked in hot ashes (southern) | Synonyms: ash cake, corn tash |
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| ashcan | (noun) a bin that holds rubbish until it is collected | Synonyms: ash-bin, ash bin, ashbin, dustbin, garbage can, trash barrel, trash bin, trash can, wastebin |
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| aspect | (noun) the feelings expressed on a person's face | Synonyms: expression, face, facial expression, look |
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| (noun) a characteristic to be considered | - |
| (noun) a distinct feature or element in a problem | Synonyms: facet |
| (noun) the visual percept of a region | Synonyms: panorama, prospect, scene, view, vista |
| (noun) the beginning or duration or completion or repetition of the action of a verb | - |
| aspic | (noun) savory jelly based on fish or meat stock used as a mold for meats or vegetables | - |
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| assistance | (noun) the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: aid, assist, help |
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| (noun) a person or thing that is a resource that helps make something easier or possible to do | Synonyms: aid, help |
| (noun) gift of money or other material help to support a person or cause | Synonyms: aid, economic aid, economic assistance, financial aid, financial assistance |
| associability | (noun) the capability of being easily associated or joined or connected in thought | Synonyms: associableness |
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| associableness | (noun) the capability of being easily associated or joined or connected in thought | Synonyms: associability |
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| associate | (noun) a degree granted by a two-year college on successful completion of the undergraduates course of studies | Synonyms: associate degree |
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| (noun) any event that usually accompanies or is closely connected with another | - |
| (noun) a person who joins with others in some activity or endeavor | - |
| (noun) a friend who is frequently in the company of another | Synonyms: companion, comrade, familiar, fellow |
| (noun) a person with subordinate membership in a society, institution, or commercial enterprise | - |
| associateship | (noun) the position of associate (as in an office or academy) | - |
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| association | (noun) the act of consorting with or joining with others | - |
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| (noun) the process of bringing ideas or events together in memory or imagination | Synonyms: connection, connexion |
| (noun) a formal organization of people or groups of people | - |
| (noun) (ecology) a group of organisms (plants and animals) that live together in a certain geographical region and constitute a community with a few dominant species | - |
| (noun) (chemistry) any process of combination (especially in solution) that depends on relatively weak chemical bonding | - |
| (noun) a relation resulting from interaction or dependence | - |
| (noun) a social or business relationship | Synonyms: affiliation, tie-up, tie |
| (noun) the state of being connected together as in memory or imagination | - |
| associationism | (noun) (psychology) a theory that association is the basic principle of mental activity | Synonyms: association theory |
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| assonance | (noun) the repetition of similar vowels in the stressed syllables of successive words | Synonyms: vowel rhyme |
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| assurance | (noun) freedom from doubt; belief in yourself and your abilities | Synonyms: authority, confidence, self-assurance, self-confidence, sureness |
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| (noun) a statement intended to inspire confidence | - |
| (noun) a binding commitment to do or give or refrain from something | Synonyms: pledge |
| (noun) a British term for some kinds of insurance | - |
| asthmatic | (noun) a person suffering from asthma | - |
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| astringence | (noun) a sharp astringent taste; the taste experience when a substance causes the mouth to pucker | Synonyms: astringency |
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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 |
| astrocyte | (noun) comparatively large neuroglial cell | - |
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| astrodynamics | (noun) the branch of astronomy that studies the motion of natural and artificial bodies in space | - |
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