| arista | (noun) bristlelike process near the tip of the antenna of certain flies | - |
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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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| aristocratic | (adjective) belonging to or characteristic of the nobility or aristocracy | Synonyms: aristocratical, blue-blooded, blue, gentle, patrician |
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| aristocratical | (adjective) belonging to or characteristic of the nobility or aristocracy | Synonyms: aristocratic, blue-blooded, blue, gentle, patrician |
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| aristocratically | (adverb) in an aristocratic manner | - |
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| aristocratism | (noun) the principles, practices or characteristics of aristocracy. | - |
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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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| aromatise | (verb) fill or impregnate with an odor | Synonyms: aromatize, perfume |
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| arriviste | (noun) a person who has suddenly risen to a higher economic status but has not gained social acceptance of others in that class | Synonyms: nouveau-riche, parvenu, upstart |
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| arsonist | (noun) a criminal who illegally sets fire to property | Synonyms: firebug, incendiary |
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| artemisia | (noun) any of various composite shrubs or herbs of the genus Artemisia having aromatic green or greyish foliage | - |
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| arterialise | (verb) change venous blood into arterial blood | Synonyms: arterialize |
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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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| arteritis | (noun) inflammation of an artery | - |
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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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| artificialism | (noun) Czech surrealism founded in 1928 by Jindrich Styrsky and Toyen (Marie Cerminova). | - |
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| artisan | (noun) a skilled worker who practices some trade or handicraft | Synonyms: artificer, craftsman, journeyman |
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| artist | (noun) a person whose creative work shows sensitivity and imagination | Synonyms: creative person |
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| artiste | (noun) a public performer (a dancer or singer) | - |
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| artistic | (adjective) relating to or characteristic of art or artists | - |
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| (adjective) satisfying aesthetic standards and sensibilities | - |
| (adjective) aesthetically pleasing | Synonyms: aesthetic, esthetic |
| artistically | (adverb) in an artistic manner | - |
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| artistry | (noun) a superior skill that you can learn by study and practice and observation | Synonyms: art, prowess |
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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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| 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 | - |
| 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 |
| 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 |
| aspidistra | (noun) evergreen perennial with large handsome basal leaves; grown primarily as a foliage houseplant | Synonyms: Aspidistra elatio, bar-room plant, cast-iron plant |
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| assist | (noun) (sports) the act of enabling another player to make a good play | - |
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| (noun) the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: aid, assistance, help |
| (verb) act as an assistant in a subordinate or supportive function | - |
| (verb) work for, or be a servant to | Synonyms: attend, attend to, serve, wait on |
| (verb) give help or assistance; be of service | Synonyms: aid, help |
| 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 |
| assistant | (adjective) of or relating to a person who is subordinate to another | Synonyms: adjunct |
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| (noun) a person who contributes to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: help, helper, supporter |
| assisted | (adjective) having help; often used as a combining form | Synonyms: aided |
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| assistive | (adjective) giving assistance | - |
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| associationism | (noun) (psychology) a theory that association is the basic principle of mental activity | Synonyms: association theory |
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| astereognosis | (noun) a loss of the ability to recognize objects by handling them | Synonyms: tactile agnosia |
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| asterisk | (noun) a star-shaped character * used in printing | Synonyms: star |
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| (verb) mark with an asterisk | Synonyms: star |
| asterisked | (adjective) marked with an asterisk | Synonyms: starred |
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| asterism | (noun) (astronomy) a cluster of stars (or a small constellation) | - |
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| (noun) (mineralogy) a star-shaped figure with six rays that is seen in some crystal structures under reflected or transmitted light | - |
| asterismal | (adjective) relating to asterisms or constellations | - |
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| astigmatism | (noun) (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point | Synonyms: astigmia |
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| (noun) (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people | Synonyms: astigmia |
| astonish | (verb) affect with wonder | Synonyms: amaze, astound |
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| astonished | (adjective) filled with the emotional impact of overwhelming surprise or shock | Synonyms: amazed, astonied, astounded, stunned |
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| astonishing | (adjective) so surprisingly impressive as to stun or overwhelm | Synonyms: astounding, staggering, stupefying |
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| (adjective) surprising greatly | Synonyms: amazing |
| astonishingly | (adverb) in an amazing manner; to everyone's surprise | Synonyms: amazingly, surprisingly |
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| astonishment | (noun) the feeling that accompanies something extremely surprising | Synonyms: amazement |
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| astrologist | (noun) someone who predicts the future by the positions of the planets and sun and Moon | Synonyms: astrologer |
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| astrophysicist | (noun) an astronomer who studies the physical properties of celestial bodies | - |
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| asynchronism | (noun) the relation that exists when things occur at unrelated times | Synonyms: asynchrony, desynchronisation, desynchronization, desynchronizing |
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| asynclitism | (noun) the presentation during labor of the head of the fetus at an abnormal angle | Synonyms: obliquity |
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| ataraxis | (noun) the absence of mental stress or anxiety | Synonyms: heartsease, peace, peace of mind, peacefulness, repose, serenity |
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| atavism | (noun) a reappearance of an earlier characteristic | Synonyms: reversion, throwback |
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| atavist | (noun) an organism that has the characteristics of a more primitive type of that organism | Synonyms: throwback |
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| atavistic | (adjective) characteristic of an atavist | Synonyms: throwback |
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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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| atheism | (noun) a lack of belief in the existence of God or gods | - |
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| atheist | (adjective) related to or characterized by or given to atheism | Synonyms: atheistic, atheistical |
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| (noun) someone who does not believe in the existence of a god | - |
| atheistic | (adjective) related to or characterized by or given to atheism | Synonyms: atheist, atheistical |
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| (adjective) rejecting any belief in gods | Synonyms: atheistical, unbelieving |
| atheistical | (adjective) related to or characterized by or given to atheism | Synonyms: atheist, atheistic |
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| (adjective) rejecting any belief in gods | Synonyms: atheistic, unbelieving |
| atherogenesis | (noun) the formation of atheromas on the walls of the arteries as in atherosclerosis | - |
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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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| athleticism | (noun) intense energy | Synonyms: strenuosity |
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| atomisation | (noun) separating something into fine particles | Synonyms: atomization, fragmentation |
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| (noun) annihilation by reducing something to atoms | Synonyms: atomization |
| atomise | (verb) break up into small particles | Synonyms: atomize |
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| (verb) strike at with firepower or bombs | Synonyms: atomize, nuke, zap |
| (verb) spray very finely | Synonyms: atomize |
| atomiser | (noun) a dispenser that turns a liquid (such as perfume) into a fine mist | Synonyms: atomizer, nebuliser, nebulizer, spray, sprayer |
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| atomism | (noun) (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles | Synonyms: atomic theory, atomist theory, atomistic theory |
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| (noun) (psychology) a theory that reduces all mental phenomena to simple elements (sensations and feelings) that form complex ideas by association | - |
| atomistic | (adjective) divided into separate and often disparate elements | Synonyms: atomistical |
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| atomistical | (adjective) divided into separate and often disparate elements | Synonyms: atomistic |
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| atonalism | (noun) the absence of a key; alternative to the diatonic system | Synonyms: atonality |
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| atonalistic | (adjective) of or relating to atonalism | - |
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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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| attitudinise | (verb) assume certain affected attitudes | Synonyms: attitudinize |
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| audiovisual | (adjective) involving both hearing and seeing (usually relating to teaching aids) | - |
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| (noun) materials using sight or sound to present information | Synonyms: audiovisual aid |
| auriscope | (noun) medical instrument consisting of a magnifying lens and light; used for examining the external ear (the auditory meatus and especially the tympanic membrane) | Synonyms: auroscope, otoscope |
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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 |
| authorise | (verb) grant authorization or clearance for | Synonyms: authorize, clear, pass |
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| (verb) give or delegate power or authority to | Synonyms: authorize, empower |
| authorised | (adjective) endowed with authority | Synonyms: authoritative, authorized |
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| authoriser | (noun) an authority who authorizes (people or actions) | Synonyms: authorizer |
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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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| 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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| autistic | (adjective) characteristic of or affected with autism | - |
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| autocatalysis | (noun) catalysis in which the catalyst is one of the products of the reaction | - |
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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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| autogenesis | (noun) a hypothetical organic phenomenon by which living organisms are created from nonliving matter | Synonyms: abiogenesis, autogeny, spontaneous generation |
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| autolysis | (noun) lysis of plant or animal tissue by an internal process | Synonyms: self-digestion |
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| automatise | (verb) make automatic or control or operate automatically | Synonyms: automate, automatize |
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| (verb) turn into an automaton | Synonyms: automatize |
| automatism | (noun) any reaction that occurs automatically without conscious thought or reflection (especially the undirected behavior seen in psychomotor epilepsy) | - |
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| automobilist | (noun) someone who drives (or travels in) an automobile | Synonyms: motorist |
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| autotelism | (noun) belief that a work of art is an end in itself or its own justification | - |
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| autotomise | (verb) cause a body part to undergo autotomy | Synonyms: autotomize |
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| auxesis | (noun) growth from increase in cell size without cell division | - |
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