| ablaut | (noun) a vowel whose quality or length is changed to indicate linguistic distinctions (such as sing sang sung song) | - |
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| ablution | (noun) the ritual washing of a priest's hands or of sacred vessels | - |
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| absolute | (noun) something that is conceived or that exists independently and not in relation to other things; something that does not depend on anything else and is beyond human control; something that is not relative | - |
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| absoluteness | (noun) the quality of being absolute | - |
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| (noun) the quality of being complete or utter or extreme | Synonyms: starkness, utterness |
| absolution | (noun) the act of absolving or remitting; formal redemption as pronounced by a priest in the sacrament of penance | Synonyms: remission, remission of sin, remittal |
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| (noun) the condition of being formally forgiven by a priest in the sacrament of penance | - |
| absolutisation | (noun) the process of rendering something absolute or converting it into an absolute. | Synonyms: absolutization |
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| absolutism | (noun) the doctrine of an absolute being, often related to idealism in philosophy. | - |
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| (noun) an ideological belief in the complete and unrestricted power of government. | Synonyms: totalism, totalitarianism |
| (noun) a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.) | Synonyms: authoritarianism, Caesarism, despotism, dictatorship, monocracy, one-man rule, shogunate, Stalinism, totalitarianism, tyranny |
| (noun) dominance through threat of punishment and violence | Synonyms: despotism, tyranny |
| absolutist | (noun) one who advocates absolutism | - |
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| absolutization | (noun) the process of rendering something absolute or converting it into an absolute. | Synonyms: absolutisation |
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| abutment | (noun) a masonry support that touches and directly receives thrust or pressure of an arch or bridge | - |
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| (noun) point of contact between two objects or parts | - |
| abutter | (noun) the owner of contiguous property | - |
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| accouterment | (noun) clothing that is worn or carried, but not part of your main clothing | Synonyms: accessory, accoutrement |
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| accoutrement | (noun) clothing that is worn or carried, but not part of your main clothing | Synonyms: accessory, accouterment |
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| acebutolol | (noun) an oral beta blocker (trade name Sectral) used in treating hypertension | Synonyms: Sectral |
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| acute | (noun) a mark placed above a vowel to indicate pronunciation | Synonyms: acute accent, ague |
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| acuteness | (noun) the quality of having a sharp edge or point | - |
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| (noun) a quick and penetrating intelligence | Synonyms: acuity, keenness, sharpness |
| (noun) a sensitivity that is keen and highly developed | - |
| adjutant | (noun) large Indian stork with a military gait | Synonyms: adjutant bird, adjutant stork, Leptoptilus dubius |
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| (noun) an officer who acts as military assistant to a more senior officer | Synonyms: aide-de-camp, aide |
| aeronaut | (noun) someone who operates an aircraft | Synonyms: aviator, flier, flyer |
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| aeronautics | (noun) the theory and practice of navigation through air or space | Synonyms: astronautics |
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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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| 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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| albuterol | (noun) a bronchodilator (trade names Ventolin or Proventil) used for asthma and emphysema and other lung conditions; available in oral or inhalant forms; side effects are tachycardia and shakiness | Synonyms: Proventil, Ventolin |
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| allmouth | (noun) fishes having large mouths with a wormlike filament attached for luring prey | Synonyms: angler, angler fish, anglerfish, goosefish, Lophius Americanus, lotte, monkfish |
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| allocution | (noun) (rhetoric) a formal or authoritative address that advises or exhorts | - |
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| altazimuth | (noun) an instrument that measures the altitude and azimuth of celestial bodies; used in navigation | - |
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| amputation | (noun) a surgical removal of all or part of a limb | - |
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| (noun) a condition of disability resulting from the loss of one or more limbs | - |
| amputator | (noun) a surgeon who removes part or all of a limb | - |
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| amputee | (noun) someone who has had a limb removed by amputation | - |
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| anacoluthia | (noun) an abrupt change within a sentence from one syntactic structure to another | Synonyms: anacoluthon |
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| anacoluthon | (noun) an abrupt change within a sentence from one syntactic structure to another | Synonyms: anacoluthia |
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| antineutrino | (noun) the antiparticle of a neutrino | - |
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| antineutron | (noun) the antiparticle of a neutron | - |
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| aquanaut | (noun) an underwater swimmer equipped with a face mask and foot fins and either a snorkel or an air cylinder | Synonyms: skin-diver |
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| (noun) a skilled worker who can live in underwater installations and participate in scientific research | Synonyms: oceanaut |
| arbutus | (noun) any of several evergreen shrubs of the genus Arbutus of temperate Europe and America | - |
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| architeuthis | (noun) largest mollusk known about but never seen (to 60 feet long) | Synonyms: giant squid |
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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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| argonaut | (noun) someone engaged in a dangerous but potentially rewarding adventure | - |
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| astronaut | (noun) a person trained to travel in a spacecraft | Synonyms: cosmonaut, spaceman |
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| astronautics | (noun) the theory and practice of navigation through air or space | Synonyms: aeronautics |
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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 |
| attribute | (noun) an abstraction belonging to or characteristic of an entity | - |
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| (noun) a construct whereby objects or individuals can be distinguished | Synonyms: dimension, property |
| attribution | (noun) assigning to a cause or source | Synonyms: ascription |
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| (noun) assigning some quality or character to a person or thing | Synonyms: ascription |
| autacoid | (noun) any physiologically active internal secretion especially one of uncertain classification | Synonyms: autocoid |
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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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| auteur | (noun) a filmmaker who has a personal style and keeps creative control over his or her works | - |
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| authentication | (noun) validating the authenticity of something or someone | Synonyms: certification |
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| (noun) a mark on an article of trade to indicate its origin and authenticity | Synonyms: assay-mark, hallmark |
| authenticator | (noun) one who determines authenticity (as of works of art) or who guarantees validity | Synonyms: appraiser |
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| authenticity | (noun) undisputed credibility | Synonyms: genuineness, legitimacy |
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| author | (noun) writes (books or stories or articles or the like) professionally (for pay) | Synonyms: writer |
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| (noun) someone who originates or causes or initiates something | Synonyms: generator, source |
| authoress | (noun) a woman author | - |
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| authorisation | (noun) the act of conferring legality or sanction or formal warrant | Synonyms: authorization, empowerment |
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| (noun) the power or right to give orders or make decisions | Synonyms: authority, authorization, dominance, potency, say-so |
| (noun) official permission or approval | Synonyms: authority, authorization, sanction |
| (noun) a document giving an official instruction or command | Synonyms: authorization, mandate |
| authoriser | (noun) an authority who authorizes (people or actions) | Synonyms: authorizer |
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| authoritarian | (noun) a person who behaves in a tyrannical manner | Synonyms: dictator |
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| authoritarianism | (noun) a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.) | Synonyms: absolutism, Caesarism, despotism, dictatorship, monocracy, one-man rule, shogunate, Stalinism, totalitarianism, tyranny |
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| authorities | (noun) the organization that is the governing authority of a political unit | Synonyms: government, regime |
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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 | - |
| authorization | (noun) the act of conferring legality or sanction or formal warrant | Synonyms: authorisation, empowerment |
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| (noun) the power or right to give orders or make decisions | Synonyms: authorisation, authority, dominance, potency, say-so |
| (noun) official permission or approval | Synonyms: authorisation, authority, sanction |
| (noun) a document giving an official instruction or command | Synonyms: authorisation, mandate |
| authorizer | (noun) an authority who authorizes (people or actions) | Synonyms: authoriser |
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| authorship | (noun) the act of creating written works | Synonyms: composition, penning, writing |
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| (noun) the act of initiating a new idea or theory or writing | Synonyms: paternity |
| autism | (noun) (psychiatry) an abnormal absorption with the self; marked by communication disorders and short attention span and inability to treat others as people | - |
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| auto | (noun) a motor vehicle with four wheels; usually propelled by an internal combustion engine | Synonyms: automobile, car, machine, motorcar |
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| autoalarm | (noun) a radio receiving device used on ships that rings an alarm bell when a distress signal is received. | Synonyms: auto-alarm |
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| autoantibody | (noun) an antibody acting against tissues of the organism that produces it | - |
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| autobahn | (noun) an expressway in a German-speaking country | - |
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| autobiographer | (noun) someone who writes their own biography | - |
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| autobiography | (noun) a biography of yourself | - |
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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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| autochthon | (noun) the earliest known inhabitants of a region | - |
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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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| autoclave | (noun) a device for heating substances above their boiling point; used to manufacture chemicals or to sterilize surgical instruments | Synonyms: steriliser, sterilizer |
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| autocoid | (noun) any physiologically active internal secretion especially one of uncertain classification | Synonyms: autacoid |
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| autocorrect | (noun) a system for automatically correcting text | - |
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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 |
| autocrat | (noun) a cruel and oppressive dictator | Synonyms: despot, tyrant |
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| autocue | (noun) a device that displays words for people to read | Synonyms: prompter |
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| autodidact | (noun) a person who has taught himself | - |
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| autoeroticism | (noun) using your own body as a sexual object | Synonyms: autoerotism |
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| autoerotism | (noun) using your own body as a sexual object | Synonyms: autoeroticism |
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| autofluorescence | (noun) self-induced fluorescence | - |
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| autofocus | (noun) an optical device for focussing a camera or other instrument automatically | - |
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| autogamy | (noun) self-fertilization in plants | - |
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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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| autogeny | (noun) a hypothetical organic phenomenon by which living organisms are created from nonliving matter | Synonyms: abiogenesis, autogenesis, spontaneous generation |
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| autogiro | (noun) an aircraft that is supported in flight by unpowered rotating horizontal wings (or blades); forward propulsion is provided by a conventional propeller | Synonyms: autogyro, gyroplane |
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| autograft | (noun) tissue that is taken from one site and grafted to another site on the same person | Synonyms: autoplasty |
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| autograph | (noun) something written by one's own hand | - |
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| (noun) a person's own signature | Synonyms: John Hancock |
| autogyro | (noun) an aircraft that is supported in flight by unpowered rotating horizontal wings (or blades); forward propulsion is provided by a conventional propeller | Synonyms: autogiro, gyroplane |
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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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| autoinjector | (noun) a hypodermic syringe to use in injecting yourself with a liquid | - |
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| autolatry | (noun) the worship of yourself | Synonyms: idiolatry, self-worship |
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| autoloader | (noun) a firearm that reloads itself | Synonyms: self-loader |
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| autolysis | (noun) lysis of plant or animal tissue by an internal process | Synonyms: self-digestion |
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| automaker | (noun) a business engaged in the manufacture of automobiles | Synonyms: auto maker, auto manufacturer, car maker, car manufacturer, carmaker |
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| automat | (noun) a cafeteria where food is served from machines | - |
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| (noun) a vending machine from which you can get food | - |
| automatic | (noun) self-loading rifle capable of automatic fire | Synonyms: automatic rifle, machine rifle |
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| (noun) a pistol that will keep firing until the ammunition is gone or the trigger is released | Synonyms: automatic pistol |