| 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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| ashram | (noun) (India) a place of religious retreat for Hindus | - |
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| (noun) a place of religious retreat modeled after the Indian ashram | - |
| aspartame | (noun) an artificial sweetener made from aspartic acid; used as a calorie-free sweetener | - |
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| aspersorium | (noun) the basin or other vessel that holds holy water in Roman Catholic Churches | - |
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| (noun) a short-handled device with a globe containing a sponge; used for sprinkling holy water | Synonyms: aspergill |
| assemblage | (noun) the social act of assembling | Synonyms: assembly, gathering |
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| (noun) a system of components assembled together for a particular purpose | Synonyms: hookup |
| (noun) a group of persons together in one place | Synonyms: gathering |
| (noun) several things grouped together or considered as a whole | Synonyms: accumulation, aggregation, collection |
| assembler | (noun) a program to convert assembly language into machine language | Synonyms: assembly program |
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| assembling | (noun) the act of gathering something together | Synonyms: aggregation, collecting, collection |
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| 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 | - |
| assemblyman | (noun) someone who is a member of a legislative assembly | - |
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| assemblywoman | (noun) a woman assemblyman | - |
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| assessment | (noun) the act of judging or assessing a person or situation or event | Synonyms: judgement, judgment |
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| (noun) the market value set on assets | - |
| (noun) the classification of someone or something with respect to its worth | Synonyms: appraisal |
| (noun) an amount determined as payable | - |
| assignment | (noun) a duty that you are assigned to perform (especially in the armed forces) | Synonyms: duty assignment |
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| (noun) the act of putting a person into a non-elective position | Synonyms: appointment, designation, naming |
| (noun) the act of distributing something to designated places or persons | Synonyms: assigning |
| (noun) an undertaking that you have been assigned to do (as by an instructor) | - |
| (noun) the instrument by which a claim or right or interest or property is transferred from one person to another | - |
| (noun) (law) a transfer of property by deed of conveyance | Synonyms: grant |
| assimilability | (noun) Capability of being taken in and utilized as nourishment. | - |
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| assimilation | (noun) in the theories of Jean Piaget: the application of a general schema to a particular instance | - |
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| (noun) the process of assimilating new ideas into an existing cognitive structure | Synonyms: acculturation |
| (noun) a linguistic process by which a sound becomes similar to an adjacent sound | - |
| (noun) the process of absorbing nutrients into the body after digestion | Synonyms: absorption |
| (noun) the social process of absorbing one cultural group into harmony with another | Synonyms: absorption |
| (noun) the state of being assimilated; people of different backgrounds come to see themselves as part of a larger national family | - |
| assimilator | (noun) someone (especially a child) who learns (as from a teacher) or takes up knowledge or beliefs | Synonyms: learner, scholar, student |
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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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| assortment | (noun) the act of distributing things into classes or categories of the same type | Synonyms: categorisation, categorization, classification, compartmentalisation, compartmentalization |
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| (noun) a collection containing a variety of sorts of things | Synonyms: miscellanea, miscellany, mixed bag, mixture, motley, potpourri, salmagundi, smorgasbord, variety |
| assuagement | (noun) the feeling that comes when something burdensome is removed or reduced | Synonyms: alleviation, relief |
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| assumption | (noun) the act of taking possession of or power over something | Synonyms: laying claim |
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| (noun) the act of assuming or taking for granted | - |
| (noun) audacious (even arrogant) behavior that you have no right to | Synonyms: effrontery, presumption, presumptuousness |
| (noun) a hypothesis that is taken for granted | Synonyms: supposal, supposition |
| (noun) a statement that is assumed to be true and from which a conclusion can be drawn | Synonyms: premise, premiss |
| 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 | - |
| asthma | (noun) respiratory disorder characterized by wheezing; usually of allergic origin | Synonyms: asthma attack, bronchial asthma |
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| asthmatic | (noun) a person suffering from asthma | - |
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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 |
| astigmia | (noun) (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point | Synonyms: astigmatism |
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| (noun) (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people | Synonyms: astigmatism |
| astonishment | (noun) the feeling that accompanies something extremely surprising | Synonyms: amazement |
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| astrodome | (noun) a transparent dome on top of an airplane where the navigator can make celestial observations | - |
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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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| astrometry | (noun) the branch of astronomy that deals with the measurement of the position and motion of celestial bodies | - |
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| astronomer | (noun) a physicist who studies astronomy | Synonyms: stargazer, uranologist |
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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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| asylum | (noun) a hospital for mentally incompetent or unbalanced person | Synonyms: insane asylum, institution, mental home, mental hospital, mental institution, psychiatric hospital |
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| (noun) a shelter from danger or hardship | Synonyms: refuge, sanctuary |
| asymmetry | (noun) (mathematics) a lack of symmetry | - |
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| asymptote | (noun) a straight line that is the limiting value of a curve; can be considered as tangent at infinity | - |
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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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| atavism | (noun) a reappearance of an earlier characteristic | Synonyms: reversion, throwback |
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| atheism | (noun) a lack of belief in the existence of God or gods | - |
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| athenaeum | (noun) a place where reading materials are available | Synonyms: atheneum |
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| (noun) a literary or scientific association for the promotion of learning | Synonyms: atheneum |
| atheneum | (noun) a place where reading materials are available | Synonyms: athenaeum |
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| (noun) a literary or scientific association for the promotion of learning | Synonyms: athenaeum |
| atheroma | (noun) a fatty deposit in the intima (inner lining) of an artery; can obstruct blood flow | - |
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| athleticism | (noun) intense energy | Synonyms: strenuosity |
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| atm | (noun) a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade | Synonyms: atmosphere, standard atmosphere, standard pressure |
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| atmometer | (noun) an instrument that measures rate of evaporation of water | Synonyms: evaporometer |
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| atmoradiograph | (noun) a device which measures the frequency of occurrence of atmospherics. | - |
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| atmosphere | (noun) a distinctive but intangible quality surrounding a person or thing | Synonyms: air, aura |
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| (noun) the mass of air surrounding the Earth | Synonyms: air |
| (noun) the envelope of gases surrounding any celestial body | - |
| (noun) a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade | Synonyms: atm, standard atmosphere, standard pressure |
| (noun) the weather or climate at some place | Synonyms: atmospheric state |
| (noun) a particular environment or surrounding influence | Synonyms: ambiance, ambience |
| atmospherics | (noun) a crackling or hissing noise caused by electrical interference | Synonyms: atmospheric static, static |
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| atom | (noun) (physics and chemistry) the smallest component of an element having the chemical properties of the element | - |
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| (noun) (nontechnical usage) a tiny piece of anything | Synonyms: corpuscle, molecule, mote, particle, speck |
| atomisation | (noun) separating something into fine particles | Synonyms: atomization, fragmentation |
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| (noun) annihilation by reducing something to atoms | Synonyms: atomization |
| 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 | - |
| atomization | (noun) separating something into fine particles | Synonyms: atomisation, fragmentation |
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| (noun) annihilation by reducing something to atoms | Synonyms: atomisation |
| atomizer | (noun) a dispenser that turns a liquid (such as perfume) into a fine mist | Synonyms: atomiser, nebuliser, nebulizer, spray, sprayer |
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| atonalism | (noun) the absence of a key; alternative to the diatonic system | Synonyms: atonality |
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| atonement | (noun) the act of atoning for sin or wrongdoing (especially appeasing a deity) | Synonyms: expiation, propitiation |
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| (noun) compensation for a wrong | Synonyms: expiation, satisfaction |
| atrium | (noun) the central area in a building; open to the sky | - |
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| (noun) any chamber that is connected to other chambers or passageways (especially one of the two upper chambers of the heart) | - |
| atrophedema | (noun) recurrent large circumscribed areas of subcutaneous edema; onset is sudden and it disappears within 24 hours; seen mainly in young women, often as an allergic reaction to food or drugs | Synonyms: angioedema, giant hives, periodic edema, Quincke's edema |
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| attachment | (noun) the act of fastening things together | Synonyms: fastening |
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| (noun) the act of attaching or affixing something | Synonyms: affixation |
| (noun) faithful support for a cause or political party or religion | Synonyms: adherence, adhesion |
| (noun) a supplementary part or accessory | - |
| (noun) a connection that fastens things together | Synonyms: bond |
| (noun) a writ authorizing the seizure of property that may be needed for the payment of a judgment in a judicial proceeding | - |
| (noun) a feeling of affection for a person or an institution | Synonyms: fond regard |
| attainment | (noun) the act of achieving an aim | - |
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| (noun) arrival at a new stage | - |
| (noun) an ability that has been acquired by training | Synonyms: accomplishment, acquirement, acquisition, skill |
| attempt | (noun) earnest and conscientious activity intended to do or accomplish something | Synonyms: effort, endeavor, endeavour, try |
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| (noun) the act of attacking | Synonyms: attack |
| attempter | (noun) one who tries | Synonyms: essayer, trier |
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| audiogram | (noun) a graphical representation of a person's auditory sensitivity to sound | - |
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| audiometer | (noun) an instrument used to measure the sensitivity of hearing | Synonyms: sonometer |
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| audiometry | (noun) measuring sensitivity of hearing | - |
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| (noun) the measurement of hearing | Synonyms: audiology |
| auditorium | (noun) the area of a theater or concert hall where the audience sits | - |
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| augmentation | (noun) the act of augmenting | - |
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| (noun) the statement of a theme in notes of greater duration (usually twice the length of the original) | - |
| (noun) the amount by which something becomes greater | - |
| 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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| 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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| 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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| autogamy | (noun) self-fertilization in plants | - |
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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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| 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 |
| automation | (noun) the act of implementing the control of equipment with advanced technology; usually involving electronic hardware | Synonyms: mechanisation, mechanization |
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| (noun) equipment used to achieve automatic control or operation | - |
| (noun) the condition of being automatically operated or controlled | - |
| automatism | (noun) any reaction that occurs automatically without conscious thought or reflection (especially the undirected behavior seen in psychomotor epilepsy) | - |
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| automaton | (noun) a mechanism that can move automatically | Synonyms: golem, robot |
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| (noun) a machine that operates on its own without the need for human control | - |
| (noun) someone who acts or responds in a mechanical or apathetic way | Synonyms: zombi, zombie |
| automobile | (noun) a motor vehicle with four wheels; usually propelled by an internal combustion engine | Synonyms: auto, car, machine, motorcar |
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| automobilist | (noun) someone who drives (or travels in) an automobile | Synonyms: motorist |
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| automysophobia | (noun) a morbid fear of being dirty | - |
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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 |
| autosome | (noun) any chromosome that is not a sex chromosome; appear in pairs in body cells but as single chromosomes in spermatozoa | Synonyms: somatic chromosome |
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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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| 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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| autumn | (noun) the season when the leaves fall from the trees | Synonyms: fall |
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| avaram | (noun) evergreen Indian shrub with vivid yellow flowers whose bark is used in tanning; sometimes placed in genus Cassia | Synonyms: Cassia auriculata, Senna auriculata, tanner's cassia |
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| averment | (noun) a declaration that is made emphatically (as if no supporting evidence were necessary) | Synonyms: assertion, asseveration |
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| avitaminosis | (noun) any of several diseases caused by deficiency of one or more vitamins | Synonyms: hypovitaminosis |
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| avouchment | (noun) a statement asserting the existence or the truth of something | Synonyms: affirmation, avowal |
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| axiom | (noun) a saying that is widely accepted on its own merits | Synonyms: maxim |
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| (noun) (logic) a proposition that is not susceptible of proof or disproof; its truth is assumed to be self-evident | - |
| axolemma | (noun) outer membrane covering an axon | - |
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| azimuth | (noun) the azimuth of a celestial body is the angle between the vertical plane containing it and the plane of the meridian | Synonyms: AZ |
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| azithromycin | (noun) a systemic antibacterial medicine (trade name Zithromax) that is prescribed to treat bacterial infections in many different parts of the body | Synonyms: Zithromax |
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| azoimide | (noun) a colorless explosive liquid that is volatile and poisonous and foul-smelling | Synonyms: HN, hydrazoic acid, hydrogen azide |
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| azotaemia | (noun) accumulation in the blood of nitrogenous waste products (urea) that are usually excreted in the urine | Synonyms: azotemia, uraemia, uremia |
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| azotemia | (noun) accumulation in the blood of nitrogenous waste products (urea) that are usually excreted in the urine | Synonyms: azotaemia, uraemia, uremia |
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| aztreonam | (noun) an antibiotic (trade name Azactam) used against severe infections; has minimal side effects | Synonyms: Azactam |
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| azymia | (noun) absence of an enzyme | - |
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