| apparitional | (adjective) resembling or characteristic of a phantom | Synonyms: ghostlike, ghostly, phantasmal, spectral, spiritual |
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| 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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| appetitive | (adjective) of or relating to appetite | - |
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| applicability | (noun) relevance by virtue of being applicable to the matter at hand | Synonyms: pertinence, pertinency |
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| apposite | (adjective) being of striking appropriateness and pertinence | Synonyms: apt, pertinent |
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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 | - |
| appositional | (adjective) relating to or being in apposition | Synonyms: appositive |
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| appositive | (adjective) relating to or being in apposition | Synonyms: appositional |
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| appositively | (adverb) in an appositive manner | Synonyms: in apposition |
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| 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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| aptitudinal | (adjective) of or relating to aptitudes | - |
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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 |
| arbitrable | (adjective) appropriate for or subject to settlement by arbitration | - |
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| 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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| (verb) practice arbitrage, as in the stock market | - |
| 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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| arbitral | (adjective) relating to or resulting from arbitration | Synonyms: arbitrational |
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| arbitrament | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitration, arbitrement |
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| arbitrarily | (adverb) in a random manner | Synonyms: at random, every which way, haphazardly, indiscriminately, randomly, willy-nilly |
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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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| arbitrary | (adjective) based on or subject to individual discretion or preference or sometimes impulse or caprice | - |
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| arbitrate | (verb) act between parties with a view to reconciling differences | Synonyms: intercede, intermediate, liaise, mediate |
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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) | - |
| arbitrational | (adjective) relating to or resulting from arbitration | Synonyms: arbitral |
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| arbitrative | (adjective) relating to or having the authority to arbitrate | - |
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| 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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| architectonic | (adjective) of or pertaining to construction or architecture | Synonyms: tectonic |
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| architectonics | (noun) the science of architecture | Synonyms: tectonics |
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| architectural | (adjective) of or pertaining to the art and science of architecture | - |
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| architecturally | (adverb) with regard to architecture | - |
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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 | (adjective) relating to or involving arithmetic | Synonyms: arithmetical |
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| (noun) the branch of pure mathematics dealing with the theory of numerical calculations | - |
| arithmetical | (adjective) relating to or involving arithmetic | Synonyms: arithmetic |
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| arithmetically | (adverb) with respect to arithmetic | - |
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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 | (adjective) of or pertaining to arthritis | Synonyms: creaky, rheumatic, rheumatoid, rheumy |
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| (noun) a person afflicted with arthritis | - |
| 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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| ascitic | (adjective) of or relating to or resulting from an abnormal accumulation of protein and electrolyte rich fluid in the 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) | - |
| attitudinal | (adjective) of or relating to attitudes | - |
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| attitudinise | (verb) assume certain affected attitudes | Synonyms: attitudinize |
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| attitudinize | (verb) assume certain affected attitudes | Synonyms: attitudinise |
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| attrited | (adjective) worn by rubbing or friction | - |
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| 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 |
| attritional | (adjective) relating to or caused by attrition | - |
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| 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 |
| (verb) attend academic courses without getting credit | - |
| (verb) examine carefully for accuracy with the intent of verification | Synonyms: inspect, scrutinise, scrutinize |
| 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 |
| (verb) perform in order to get a role | Synonyms: try out |
| auditive | (adjective) of or relating to the process of hearing | Synonyms: audile, auditory |
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| 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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| auditory | (adjective) of or relating to the process of hearing | Synonyms: audile, auditive |
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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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| augitic | (adjective) of or relating to or containing the mineral augite | - |
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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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| austenitic | (adjective) composed of austenite | - |
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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 | (adjective) of or belonging to the hominid genus Australopithecus | - |
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| (noun) any of several extinct humanlike bipedal primates with relatively small brains of the genus Australopithecus; from 1 to 4 million years ago | - |
| authenticity | (noun) undisputed credibility | Synonyms: genuineness, legitimacy |
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| authoritarian | (adjective) expecting unquestioning obedience | Synonyms: dictatorial, overbearing |
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| (adjective) characteristic of an absolute ruler or absolute rule; having absolute sovereignty | Synonyms: autocratic, despotic, dictatorial, tyrannic, tyrannical |
| (noun) a person who behaves in a tyrannical manner | Synonyms: dictator |
| 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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