| artfulness | (noun) the quality of being adroit in taking unfair advantage | - |
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| arthritis | (noun) inflammation of a joint or joints | - |
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| arthrocentesis | (noun) removal of fluid from a joint by centesis | - |
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| arthrodesis | (noun) the surgical fixation of a joint which is intended to result in bone fusion | - |
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| arthropodous | (adjective) of or relating to invertebrates of the phylum Arthropoda | Synonyms: arthropodal, arthropodan |
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| arthrosporous | (adjective) of or relating to arthrospores | Synonyms: arthrosporic |
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| articulateness | (noun) the quality of being facile in speech and writing | Synonyms: fluency, volubility |
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| artiodactylous | (adjective) of or relating to or belonging to mammals of the order Artiodactyla | Synonyms: artiodactyl, even-toed |
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| artless | (adjective) simple and natural; without cunning or deceit | - |
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| (adjective) characterized by an inability to mask your feelings; not devious | Synonyms: ingenuous |
| (adjective) (of persons) lacking art or knowledge | Synonyms: uncultivated, uncultured |
| (adjective) showing lack of art | - |
| artlessness | (noun) ingenuousness by virtue of being free from artful deceit | - |
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| (noun) the quality of innocent naivete | Synonyms: ingenuousness, innocence, naturalness |
| arts | (noun) studies intended to provide general knowledge and intellectual skills (rather than occupational or professional skills) | Synonyms: humanistic discipline, humanities, liberal arts |
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| arundinaceous | (adjective) of or relating to or resembling reedlike plants of the genus Arundinaria | - |
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| as | (adverb) to the same degree (often followed by `as') | Synonyms: equally, every bit |
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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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| ascariasis | (noun) infestation of the human intestine with Ascaris roundworms | - |
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| ascesis | (noun) rigorous self-denial and active self-restraint | Synonyms: asceticism |
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| ascites | (noun) accumulation of serous fluid in peritoneal cavity | - |
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| asclepiadaceous | (adjective) of or relating to plants of the milkweed family | - |
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| ascocarpous | (adjective) of or relating to ascocarps | - |
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| ascomycetous | (adjective) related to or characteristic of fungi of the class Ascomycetes | - |
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| ascosporous | (adjective) of or relating to ascospores | Synonyms: ascosporic |
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| ascus | (noun) saclike structure in which ascospores are formed through sexual reproduction of ascomycetes | - |
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| asepsis | (noun) the process of inhibiting the growth and multiplication of microorganisms | Synonyms: antisepsis |
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| (noun) (of non-living objects) the state of being free of pathogenic organisms | Synonyms: antisepsis, sterileness, sterility |
| asparagus | (noun) edible young shoots of the asparagus plant | - |
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| (noun) plant whose succulent young shoots are cooked and eaten as a vegetable | Synonyms: Asparagus officinales, edible asparagus |
| aspergillosis | (noun) an opportunistic infection by a fungus of the genus Aspergillus; characterized by inflammation and lesions of the ear and other organs | - |
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| (noun) disease especially in agricultural workers caused by inhalation of Aspergillus spores causing lumps in skin and ears and respiratory organs | - |
| (noun) severe respiratory disease of birds that takes the form of an acute rapidly fatal pneumonia in young chickens and turkeys | Synonyms: brooder pneumonia |
| ass | (noun) slang for sexual intercourse | Synonyms: fuck, fucking, nookie, nooky, piece of ass, piece of tail, roll in the hay, screw, screwing, shag, shtup |
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| (noun) hardy and sure-footed animal smaller and with longer ears than the horse | - |
| (noun) the fleshy part of the human body that you sit on | Synonyms: arse, backside, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, hindquarters, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
| (noun) a pompous fool | - |
| assertiveness | (noun) aggressive self-assurance; given to making bold assertions | Synonyms: self-assertiveness |
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| assess | (verb) evaluate or estimate the nature, quality, ability, extent, or significance of | Synonyms: appraise, evaluate, measure, valuate, value |
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| (verb) estimate the value of (property) for taxation | - |
| (verb) set or determine the amount of (a payment such as a fine) | Synonyms: tax |
| (verb) charge (a person or a property) with a payment, such as a tax or a fine | - |
| assets | (noun) anything of material value or usefulness that is owned by a person or company | - |
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| assiduous | (adjective) marked by care and persistent effort | Synonyms: sedulous |
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| assiduousness | (noun) great and constant diligence and attention | Synonyms: assiduity, concentration |
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| assizes | (noun) the county courts of England (replaced in 1971 by Crown courts) | Synonyms: court of assize, court of assize and nisi prius |
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| associableness | (noun) the capability of being easily associated or joined or connected in thought | Synonyms: associability |
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| assuredness | (noun) great coolness and composure under strain | Synonyms: aplomb, cool, poise, sang-froid |
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| astereognosis | (noun) a loss of the ability to recognize objects by handling them | Synonyms: tactile agnosia |
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| astomatous | (adjective) having no mouth or mouthlike opening | Synonyms: mouthless |
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| astragalus | (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: anklebone, astragal, talus |
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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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| astronautics | (noun) the theory and practice of navigation through air or space | Synonyms: aeronautics |
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| astrophysics | (noun) the branch of astronomy concerned with the physical and chemical properties of celestial bodies | - |
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| astuteness | (noun) intelligence manifested by being astute (as in business dealings) | Synonyms: perspicaciousness, perspicacity, shrewdness |
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| (noun) the intellectual ability to penetrate deeply into ideas | Synonyms: deepness, depth, profoundness, profundity |
| asynchronous | (adjective) not synchronous; not occurring or existing at the same time or having the same period or phase | - |
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| (adjective) (digital communication) pertaining to a transmission technique that does not require a common clock between the communicating devices; timing signals are derived from special characters in the data stream itself | - |
| ataraxis | (noun) the absence of mental stress or anxiety | Synonyms: heartsease, peace, peace of mind, peacefulness, repose, serenity |
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| atelectasis | (noun) collapse of an expanded lung (especially in infants); also failure of pulmonary alveoli to expand at birth | - |
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| ateleiosis | (noun) a form of infantilism characterized by physical underdevelopment but normal intelligence | Synonyms: ateliosis |
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| ateliosis | (noun) a form of infantilism characterized by physical underdevelopment but normal intelligence | Synonyms: ateleiosis |
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| atherogenesis | (noun) the formation of atheromas on the walls of the arteries as in atherosclerosis | - |
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| atheromatous | (adjective) of or relating to or resembling atheroma | Synonyms: atheromatic |
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| atherosclerosis | (noun) a stage of arteriosclerosis involving fatty deposits (atheromas) inside the arterial walls, thus narrowing the arteries | Synonyms: coronary artery disease |
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| athetosis | (noun) a continuous succession of slow, writhing, involuntary movements of the hands and feet and other body parts | - |
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| athletics | (noun) an active diversion requiring physical exertion and competition | Synonyms: sport |
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| (noun) participation in sports events as an extracurricular activity | - |
| (noun) a contest between athletes | Synonyms: athletic competition, athletic contest |
| atlas | (noun) a figure of a man used as a supporting column | Synonyms: telamon |
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| (noun) the 1st cervical vertebra | Synonyms: atlas vertebra |
| (noun) a collection of maps in book form | Synonyms: book of maps, map collection |
| atmospherics | (noun) a crackling or hissing noise caused by electrical interference | Synonyms: atmospheric static, static |
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| atopognosis | (noun) absence or loss of topognosia; inability to locate correctly a point of touch | Synonyms: atopognosia |
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| atrabilious | (adjective) irritable as if suffering from indigestion | Synonyms: bilious, dyspeptic, liverish |
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| atrocious | (adjective) provoking horror | Synonyms: frightful, horrible, horrifying, ugly |
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| (adjective) exceptionally bad or displeasing | Synonyms: abominable, awful, dreadful, painful, terrible, unspeakable |
| (adjective) shockingly brutal or cruel | Synonyms: flagitious, grievous, monstrous |
| atrociousness | (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrocity, barbarity, barbarousness, heinousness |
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| attainableness | (noun) the state of being achievable | Synonyms: achievability, attainability |
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| attentiveness | (noun) the trait of being considerate and thoughtful of others | - |
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| (noun) the trait of being observant and paying attention | - |
| (noun) paying particular notice (as to children or helpless people) | Synonyms: heed, paying attention, regard |
| attractiveness | (noun) sexual allure | - |
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| (noun) the quality of arousing interest; being attractive or something that attracts | Synonyms: attraction |
| audacious | (adjective) disposed to venture or take risks | Synonyms: daring, venturesome, venturous |
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| (adjective) invulnerable to fear or intimidation | Synonyms: brave, dauntless, fearless, hardy, intrepid, unfearing |
| (adjective) unrestrained by convention or propriety | Synonyms: bald-faced, barefaced, bodacious, brassy, brazen-faced, brazen, insolent |
| audaciousness | (noun) fearless daring | Synonyms: audacity, temerity |
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| (noun) aggressive boldness or unmitigated effrontery | Synonyms: audacity |
| audibleness | (noun) quality or fact or degree of being audible or perceptible by the ear | Synonyms: audibility |
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| auriferous | (adjective) containing gold | Synonyms: gold-bearing |
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| aurochs | (noun) large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle | Synonyms: Bos primigenius, urus |
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| (noun) European bison having a smaller and higher head than the North American bison | Synonyms: Bison bonasus, wisent |
| aurous | (adjective) of or relating to or containing or derived from gold | Synonyms: auric |
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| auspices | (noun) kindly endorsement and guidance | Synonyms: aegis, protection |
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| auspicious | (adjective) auguring favorable circumstances and good luck | - |
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| auspiciousness | (noun) the favorable quality of strongly indicating a successful result | Synonyms: propitiousness |
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| austereness | (noun) extreme plainness | Synonyms: severeness, severity |
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| authoress | (noun) a woman author | - |
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| authorities | (noun) the organization that is the governing authority of a political unit | Synonyms: government, regime |
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| autobus | (noun) a vehicle carrying many passengers; used for public transport | Synonyms: bus, charabanc, coach, double-decker, jitney, motorbus, motorcoach, omnibus, passenger vehicle |
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| autocatalysis | (noun) catalysis in which the catalyst is one of the products of the reaction | - |
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| autochthonous | (adjective) of rocks, deposits, etc.; found where they and their constituents were formed | - |
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| (adjective) originating where it is found | Synonyms: autochthonal, autochthonic, endemic, indigenous |
| autoecious | (adjective) of parasites especially rust fungi; completing the entire life cycle on a single host | Synonyms: homoecious |
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| autofocus | (noun) an optical device for focussing a camera or other instrument automatically | - |
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| autogamous | (adjective) characterized by or fit for autogamy | Synonyms: autogamic |
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| autogenesis | (noun) a hypothetical organic phenomenon by which living organisms are created from nonliving matter | Synonyms: abiogenesis, autogeny, spontaneous generation |
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| autogenics | (noun) training patients in self-induced relaxation | Synonyms: autogenic therapy, autogenic training |
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| autogenous | (adjective) originating within the body | Synonyms: autogenic |
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| autoicous | (adjective) having male and female reproductive organs in separate clusters on the same plant | - |
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| autologous | (adjective) derived from organisms of the selfsame individual | - |
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| autolysis | (noun) lysis of plant or animal tissue by an internal process | Synonyms: self-digestion |
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| autonomous | (adjective) (of political bodies) not controlled by outside forces | Synonyms: independent, self-governing, sovereign |
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| (adjective) (of persons) free from external control and constraint in e.g. action and judgment | Synonyms: self-directed, self-reliant |
| (adjective) existing as an independent entity | - |
| auxesis | (noun) growth from increase in cell size without cell division | - |
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| availableness | (noun) the quality of being at hand when needed | Synonyms: accessibility, availability, handiness |
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| avaricious | (adjective) immoderately desirous of acquiring e.g. wealth | Synonyms: covetous, grabby, grasping, greedy, prehensile |
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| avariciousness | (noun) extreme greed for material wealth | Synonyms: avarice, covetousness, cupidity |
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| avens | (noun) any of various perennials of the genus Geum having usually pinnate basal leaves and variously colored flowers | - |
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| averageness | (noun) ordinariness as a consequence of being average and not outstanding | Synonyms: mediocrity |
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| (noun) the state of being that is average; indicates normality but with connotations of mediocrity | - |
| aviatress | (noun) a woman aviator | Synonyms: airwoman, aviatrix |
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| avidness | (noun) a positive feeling of wanting to push ahead with something | Synonyms: avidity, eagerness, keenness |
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| avionics | (noun) science and technology of electronic systems and devices for aeronautics and astronautics | - |
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| avitaminosis | (noun) any of several diseases caused by deficiency of one or more vitamins | Synonyms: hypovitaminosis |
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| avoirdupois | (noun) excess bodily weight | Synonyms: blubber, fat, fatness |
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| (noun) a system of weights based on the 16-ounce pound (or 7,000 grains) | Synonyms: avoirdupois weight |
| awareness | (noun) having knowledge of | Synonyms: cognisance, cognizance, consciousness, knowingness |
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| (noun) state of elementary or undifferentiated consciousness | Synonyms: sentience |
| awayness | (noun) the state of being elsewhere than in particular place | - |
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| aweless | (adjective) neither feeling nor showing respect | Synonyms: awless, disrespectful |
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| (adjective) devoid of any feeling of awe or reverence | Synonyms: awless |