| animosity | (noun) a feeling of ill will arousing active hostility | Synonyms: animus, bad blood |
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| annuitant | (noun) the recipient of an annuity | - |
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| annuity | (noun) income from capital investment paid in a series of regular payments | Synonyms: rente |
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| anonymity | (noun) the state of being anonymous | Synonyms: namelessness |
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| anorthite | (noun) rare plagioclastic feldspar occurring in many igneous rocks | - |
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| answerability | (noun) responsibility to someone or for some activity | Synonyms: accountability, answerableness |
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| anteriority | (noun) the quality of being in front or (in lower animals) toward the head | - |
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| (noun) preceding in time | Synonyms: antecedence, antecedency, precedence, precedency, priority |
| anthophyllite | (noun) a dark brown mineral of the amphibole group; magnesium iron silicate | - |
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| anthracite | (noun) a hard natural coal that burns slowly and gives intense heat | Synonyms: anthracite coal, hard coal |
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| anthropocentricity | (noun) an inclination to evaluate reality exclusively in terms of human values | Synonyms: anthropocentrism |
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| anthropophagite | (noun) a person who eats human flesh | Synonyms: anthropophagus, cannibal, man-eater |
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| antilogarithm | (noun) the number of which a given number is the logarithm | Synonyms: antilog |
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| antimetabolite | (noun) an antineoplastic drug that inhibits the utilization of a metabolite | - |
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| antipruritic | (noun) a substance that relieves or prevents itching | - |
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| antiquity | (noun) an artifact surviving from the past | - |
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| (noun) extreme oldness | Synonyms: ancientness |
| (noun) the historic period preceding the Middle Ages in Europe | - |
| antiredeposition | (noun) the process of preventing redeposition | - |
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| antisemitism | (noun) the intense dislike for and prejudice against Jewish people | Synonyms: anti-Semitism |
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| antisyphilitic | (noun) a drug (or other chemical agent) that is effective against syphilis | - |
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| antitauon | (noun) an antilepton of very great mass | Synonyms: tau-plus particle |
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| antithesis | (noun) the juxtaposition of contrasting words or ideas to give a feeling of balance | - |
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| (noun) exact opposite | - |
| antitoxin | (noun) an antibody that can neutralize a specific toxin | - |
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| antitrade | (noun) winds blowing from west to east and lying above the trade winds in the tropics | Synonyms: antitrade wind |
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| antitrades | (noun) wind in the upper atmosphere blowing above but in the opposite direction from the trade winds | - |
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| antitussive | (noun) any medicine used to suppress or relieve coughing | - |
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| antitype | (noun) a person or thing represented or foreshadowed by an earlier type or symbol; especially a figure or event in the New Testament having a counterpart in the Old Testament | - |
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| (noun) an opposite or contrasting type | - |
| aortitis | (noun) inflammation of the aorta | - |
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| apatite | (noun) a common complex mineral consisting of calcium fluoride phosphate or calcium chloride phosphate; a source of phosphorus | - |
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| aperitif | (noun) alcoholic beverage taken before a meal as an appetizer | - |
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| aphanite | (noun) fine-grained homogeneous rock (such as basalt) containing minerals undetectable by the naked eye | - |
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| aplite | (noun) light-colored and fine-grained granitic rock consisting chiefly of quartz and feldspars | - |
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| apoliticism | (noun) Apathy and/or antipathy towards all political affiliations. | - |
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| apparition | (noun) an act of appearing or becoming visible unexpectedly | - |
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| (noun) something existing in perception only | Synonyms: fantasm, phantasm, phantasma, phantom, shadow |
| (noun) the appearance of a ghostlike figure | - |
| (noun) a ghostly appearing figure | Synonyms: fantasm, phantasm, phantasma, phantom, specter, spectre |
| appendicitis | (noun) inflammation of the vermiform appendix | - |
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| appetite | (noun) a feeling of craving something | Synonyms: appetence, appetency |
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| applicability | (noun) relevance by virtue of being applicable to the matter at hand | Synonyms: pertinence, pertinency |
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| appositeness | (noun) appropriateness for the occasion | Synonyms: aptness |
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| apposition | (noun) the act of positioning close together (or side by side) | Synonyms: collocation, juxtaposition |
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| (noun) (biology) growth in the thickness of a cell wall by the deposit of successive layers of material | - |
| (noun) a grammatical relation between a word and a noun phrase that follows | - |
| approachability | (noun) the attribute of being easy to meet or deal with | Synonyms: accessibility |
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| aptitude | (noun) inherent ability | - |
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| aquavit | (noun) Scandinavian liquor usually flavored with caraway seeds | Synonyms: akvavit |
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| arability | (noun) the quality of land that is appropriate for cultivation | - |
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| aragonite | (noun) a mineral form of crystalline calcium carbonate; dimorphic with calcite | - |
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| arbiter | (noun) someone chosen to judge and decide a disputed issue | Synonyms: arbitrator, umpire |
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| (noun) someone with the power to settle matters at will | Synonyms: supreme authority |
| arbitrage | (noun) a kind of hedged investment meant to capture slight differences in price; when there is a difference in the price of something on two different markets the arbitrageur simultaneously buys at the lower price and sells at the higher price | - |
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| arbitrager | (noun) someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential) | Synonyms: arb, arbitrageur |
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| arbitrageur | (noun) someone who engages in arbitrage (who purchases securities in one market for immediate resale in another in the hope of profiting from the price differential) | Synonyms: arb, arbitrager |
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| arbitrament | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitration, arbitrement |
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| arbitrariness | (noun) the trait of acting unpredictably and more from whim or caprice than from reason or judgment | Synonyms: capriciousness, flightiness, whimsey, whimsicality, whimsy |
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| arbitration | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitrament, arbitrement |
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| (noun) (law) the hearing and determination of a dispute by an impartial referee agreed to by both parties (often used to settle disputes between labor and management) | - |
| arbitrator | (noun) someone chosen to judge and decide a disputed issue | Synonyms: arbiter, umpire |
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| arbitrement | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitrament, arbitration |
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| arborvitae | (noun) any of several Asian and North American conifers of the genera Thuja and Thujopsis | - |
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| archimandrite | (noun) the superior of an abbey of monks | Synonyms: abbot |
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| architect | (noun) someone who creates plans to be used in making something (such as buildings) | Synonyms: designer |
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| architectonics | (noun) the science of architecture | Synonyms: tectonics |
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| architecture | (noun) the profession of designing buildings and environments with consideration for their esthetic effect | - |
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| (noun) an architectural product or work | - |
| (noun) (computer science) the structure and organization of a computer's hardware or system software | Synonyms: computer architecture |
| (noun) the discipline dealing with the principles of design and construction and ornamentation of fine buildings | - |
| architeuthis | (noun) largest mollusk known about but never seen (to 60 feet long) | Synonyms: giant squid |
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| architrave | (noun) the lowest part of an entablature; rests immediately on the capitals of the columns | - |
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| (noun) the molding around a door or window | - |
| argentite | (noun) a valuable silver ore consisting of silver sulfide (Ag2S) | - |
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| argillite | (noun) a sedimentary rock differing from shale in being bound by silica and from slate in having no slate cleavages | - |
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| argyrodite | (noun) a rare steel-grey mineral consisting of silver and germanium and sulfur | - |
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| aridity | (noun) the quality of yielding nothing of value | Synonyms: barrenness, fruitlessness |
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| (noun) a deficiency of moisture (especially when resulting from a permanent absence of rainfall) | Synonyms: aridness, thirstiness |
| 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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| arity | (noun) the number of arguments that a function can take | - |
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| armpit | (noun) the hollow under the arm where it is joined to the shoulder | Synonyms: axilla, axillary cavity, axillary fossa |
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| aromaticity | (noun) The property of having an aroma. | - |
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| arrowsmith | (noun) a maker of arrows | - |
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| arsenopyrite | (noun) a silver-white or grey ore of arsenic | Synonyms: mispickel |
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| arteritis | (noun) inflammation of an artery | - |
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| arthritic | (noun) a person afflicted with arthritis | - |
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| arthritis | (noun) inflammation of a joint or joints | - |
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| artificiality | (noun) the quality of being produced by people and not occurring naturally | - |
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| ascites | (noun) accumulation of serous fluid in peritoneal cavity | - |
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| asexuality | (noun) having no evident sex or sex organs | Synonyms: sexlessness |
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| asininity | (noun) the quality of being asinine; stupidity combined with stubbornness | - |
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| asperity | (noun) something hard to endure | Synonyms: grimness, hardship, rigor, rigorousness, rigour, rigourousness, severeness, severity |
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| (noun) harshness of manner | Synonyms: sharpness |
| assailability | (noun) vulnerability to forceful attack | - |
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| assiduity | (noun) great and constant diligence and attention | Synonyms: assiduousness, concentration |
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| assimilability | (noun) Capability of being taken in and utilized as nourishment. | - |
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| associability | (noun) the capability of being easily associated or joined or connected in thought | Synonyms: associableness |
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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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| atonality | (noun) the absence of a key; alternative to the diatonic system | Synonyms: atonalism |
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| atonicity | (noun) lack of normal muscular tension or tonus | Synonyms: amyotonia, atonia, atony |
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| atrocity | (noun) an act of atrocious cruelty | Synonyms: inhumanity |
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| (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrociousness, barbarity, barbarousness, heinousness |
| attainability | (noun) the state of being achievable | Synonyms: achievability, attainableness |
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| attitude | (noun) a theatrical pose created for effect | - |
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| (noun) the arrangement of the body and its limbs | Synonyms: position, posture |
| (noun) a complex mental state involving beliefs and feelings and values and dispositions to act in certain ways | Synonyms: mental attitude |
| (noun) position of aircraft or spacecraft relative to a frame of reference (the horizon or direction of motion) | - |
| attrition | (noun) the act of rubbing together; wearing something down by friction | - |
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| (noun) a wearing down to weaken or destroy | - |
| (noun) sorrow for sin arising from fear of damnation | Synonyms: contriteness, contrition |
| (noun) the wearing down of rock particles by friction due to water or wind or ice | Synonyms: abrasion, detrition, grinding |
| (noun) erosion by friction | Synonyms: abrasion, corrasion, detrition |
| atypicality | (noun) any state that is not typical | Synonyms: untypicality |
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| audacity | (noun) fearless daring | Synonyms: audaciousness, temerity |
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| (noun) aggressive boldness or unmitigated effrontery | Synonyms: audaciousness |
| audibility | (noun) quality or fact or degree of being audible or perceptible by the ear | Synonyms: audibleness |
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| audit | (noun) a methodical examination or review of a condition or situation | - |
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| (noun) an inspection of the accounting procedures and records by a trained accountant or CPA | Synonyms: audited account |
| audition | (noun) a test of the suitability of a performer | Synonyms: tryout |
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| (noun) the ability to hear; the auditory faculty | Synonyms: auditory modality, auditory sense, hearing, sense of hearing |
| auditor | (noun) a qualified accountant who inspects the accounting records and practices of a business or other organization | - |
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| (noun) someone who listens attentively | Synonyms: attender, hearer, listener |
| (noun) a student who attends a course but does not take it for credit | - |
| auditorium | (noun) the area of a theater or concert hall where the audience sits | - |
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| augite | (noun) dark-green to black glassy mineral of the pyroxene group containing large amounts of aluminum and iron and magnesium | - |
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| austenite | (noun) a solid solution of ferric carbide or carbon in iron; cools to form pearlite or martensite | - |
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| austerity | (noun) the trait of great self-denial (especially refraining from worldly pleasures) | Synonyms: asceticism, nonindulgence |
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| australopithecine | (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |
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