| ability | (noun) the quality of being able to perform; a quality that permits or facilitates achievement or accomplishment | - |
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| (noun) possession of the qualities (especially mental qualities) required to do something or get something done | Synonyms: power |
| abnormality | (noun) behavior that breaches the rule or etiquette or custom or morality | Synonyms: irregularity |
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| (noun) marked strangeness as a consequence of being abnormal | Synonyms: freakishness |
| (noun) retardation sufficient to fall outside the normal range of intelligence | Synonyms: mental defectiveness |
| (noun) an abnormal physical condition resulting from defective genes or developmental deficiencies | Synonyms: abnormalcy |
| abolition | (noun) the act of abolishing a system or practice or institution (especially abolishing slavery) | Synonyms: abolishment |
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| abolitionism | (noun) the doctrine that calls for the abolition of slavery | - |
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| abolitionist | (noun) a reformer who favors abolishing slavery | Synonyms: emancipationist |
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| absorptivity | (noun) (physics) the property of a body that determines the fraction of the incident radiation or sound flux absorbed or absorbable by the body | Synonyms: absorption factor |
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| abstrusity | (noun) wisdom that is recondite and abstruse and profound | Synonyms: abstruseness, profoundness, profundity, reconditeness |
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| absurdity | (noun) a ludicrous folly | Synonyms: fatuity, fatuousness, silliness |
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| (noun) a message whose content is at variance with reason | Synonyms: absurdness, ridiculousness |
| acceptability | (noun) satisfactoriness by virtue of conforming to approved standards | Synonyms: acceptableness |
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| accessibility | (noun) the quality of being at hand when needed | Synonyms: availability, availableness, handiness |
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| (noun) the attribute of being easy to meet or deal with | Synonyms: approachability |
| acclivity | (noun) an upward slope or grade (as in a road) | Synonyms: ascent, climb, raise, rise, upgrade |
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| accountability | (noun) responsibility to someone or for some activity | Synonyms: answerability, answerableness |
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| accreditation | (noun) the act of granting credit or recognition (especially with respect to an educational institution that maintains suitable standards) | - |
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| acerbity | (noun) a rough and bitter manner | Synonyms: acrimony, bitterness, jaundice, tartness, thorniness |
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| (noun) a sharp sour taste | Synonyms: tartness |
| (noun) a sharp bitterness | - |
| achievability | (noun) the state of being achievable | Synonyms: attainability, attainableness |
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| achondrite | (noun) a stony meteor lacking chondrules | - |
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| achromaticity | (noun) the visual property of being without chromatic color | Synonyms: achromatism, colorlessness, colourlessness |
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| acidity | (noun) pH values below 7 | - |
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| (noun) the property of being acidic | Synonyms: sour, sourness |
| (noun) the taste experience when something acidic is taken into the mouth | Synonyms: acidulousness |
| aconite | (noun) any of various usually poisonous plants of the genus Aconitum having tuberous roots and palmately lobed leaves and blue or white flowers | - |
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| acquisition | (noun) the act of contracting or assuming or acquiring possession of something | - |
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| (noun) an ability that has been acquired by training | Synonyms: accomplishment, acquirement, attainment, skill |
| (noun) the cognitive process of acquiring skill or knowledge | Synonyms: learning |
| (noun) something acquired | - |
| acquisitiveness | (noun) strong desire to acquire and possess | - |
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| acquittal | (noun) a judgment of not guilty | - |
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| acquittance | (noun) a legal document evidencing the discharge of a debt or obligation | Synonyms: release |
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| acridity | (noun) extreme bitterness | Synonyms: acridness |
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| (noun) the quality of being sharply disagreeable in language or tone | Synonyms: acridness |
| (noun) having an acrid smell | - |
| acrylonitrile | (noun) a colorless liquid unsaturated nitrile made from propene | Synonyms: propenonitrile, vinyl cyanide |
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| actinolite | (noun) a green mineral of the amphibole group; calcium magnesium iron silicate | - |
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| activity | (noun) any specific behavior | - |
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| (noun) the trait of being active; moving or acting rapidly and energetically | Synonyms: activeness |
| (noun) an organic process that takes place in the body | Synonyms: bodily function, bodily process, body process |
| (noun) a process existing in or produced by nature (rather than by the intent of human beings) | Synonyms: action, natural action, natural process |
| (noun) the state of being active | Synonyms: action, activeness |
| (noun) (chemistry) the capacity of a substance to take part in a chemical reaction | - |
| actuality | (noun) the state of actually existing objectively | - |
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| acuity | (noun) a quick and penetrating intelligence | Synonyms: acuteness, keenness, sharpness |
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| (noun) sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart) | Synonyms: sharp-sightedness, visual acuity |
| adaptability | (noun) the ability to change (or be changed) to fit changed circumstances | - |
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| addition | (noun) the arithmetic operation of summing; calculating the sum of two or more numbers | Synonyms: plus, summation |
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| (noun) the act of adding one thing to another | - |
| (noun) a component that is added to something to improve it | Synonyms: add-on, improver |
| (noun) a suburban area laid out in streets and lots for a future residential area | - |
| (noun) something added to what you already have | Synonyms: accession |
| (noun) a quantity that is added | Synonyms: gain, increase |
| additive | (noun) something added to enhance food or gasoline or paint or medicine | - |
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| adenitis | (noun) inflammation of a gland or lymph node | - |
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| adesite | (noun) dark greyish extrusive rock | - |
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| adiabaticity | (noun) The condition of occurring without gain or loss of heat (and thus with no change in entropy, in the quasistatic approximation). | - |
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| adiposity | (noun) having the property of containing fat | Synonyms: adiposeness, fattiness |
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| adit | (noun) a nearly horizontal passage from the surface into a mine | - |
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| admirability | (noun) admirable excellence | Synonyms: admirableness, wonderfulness |
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| admissibility | (noun) acceptability by virtue of being admissible | - |
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| admittance | (noun) the act of admitting someone to enter | Synonyms: admission |
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| (noun) the right to enter | Synonyms: access, accession, admission, entree |
| admonition | (noun) a firm rebuke | Synonyms: admonishment, monition |
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| (noun) cautionary advice about something imminent (especially imminent danger or other unpleasantness) | Synonyms: monition, warning, word of advice |
| adorability | (noun) extreme attractiveness | Synonyms: adorableness |
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| adroitness | (noun) skillful performance or ability without difficulty | Synonyms: adeptness, deftness, facility, quickness |
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| adventitia | (noun) an enveloping or covering membrane or layer of body tissue | Synonyms: tunic, tunica |
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| adversity | (noun) a stroke of ill fortune; a calamitous event | - |
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| (noun) a state of misfortune or affliction | Synonyms: hard knocks, hardship |
| advisability | (noun) the quality of being advisable | - |
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| aerolite | (noun) a stony meteorite consisting of silicate minerals | - |
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| affability | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affableness, amiability, amiableness, bonhomie, geniality |
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| affidavit | (noun) written declaration made under oath; a written statement sworn to be true before someone legally authorized to administer an oath | - |
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| affinity | (noun) inherent resemblance between persons or things | - |
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| (noun) a natural attraction or feeling of kinship | - |
| (noun) the force attracting atoms to each other and binding them together in a molecule | Synonyms: chemical attraction |
| (noun) (immunology) the attraction between an antigen and an antibody | - |
| (noun) (anthropology) kinship by marriage or adoption; not a blood relationship | - |
| (noun) (biology) state of relationship between organisms or groups of organisms resulting in resemblance in structure or structural parts | Synonyms: phylogenetic relation |
| (noun) a close connection marked by community of interests or similarity in nature or character | Synonyms: kinship |
| agility | (noun) the gracefulness of a person or animal that is quick and nimble | Synonyms: legerity, lightness, lightsomeness, nimbleness |
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| agitation | (noun) disturbance usually in protest | Synonyms: excitement, hullabaloo, turmoil, upheaval |
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| (noun) the act of agitating something; causing it to move around (usually vigorously) | - |
| (noun) the feeling of being agitated; not calm | - |
| (noun) a state of agitation or turbulent change or development | Synonyms: ferment, fermentation, tempestuousness, unrest |
| (noun) a mental state of extreme emotional disturbance | - |
| agitator | (noun) one who agitates; a political troublemaker | Synonyms: fomenter |
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| agitprop | (noun) political propaganda (especially communist propaganda) communicated via art and literature and cinema | - |
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| agreeability | (noun) a temperamental disposition to be agreeable | Synonyms: agreeableness |
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| aitchbone | (noun) a cut of beef including the H-shaped rump bone | - |
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| akvavit | (noun) Scandinavian liquor usually flavored with caraway seeds | Synonyms: aquavit |
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| alacrity | (noun) liveliness and eagerness | Synonyms: briskness, smartness |
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| albite | (noun) a widely distributed feldspar that forms rocks | Synonyms: white feldspar |
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| alexandrite | (noun) a green variety of chrysoberyl used as a gemstone | - |
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| algidity | (noun) prostration characterized by cold and clammy skin and low blood pressure | - |
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| algorithm | (noun) a precise rule (or set of rules) specifying how to solve some problem | Synonyms: algorithmic program, algorithmic rule |
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| aliterate | (noun) a person who can read but is disinclined to derive information from literary sources | Synonyms: aliterate person |
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| alkalinity | (noun) pH values above 7 | - |
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| alliteration | (noun) use of the same consonant at the beginning of each stressed syllable in a line of verse | Synonyms: beginning rhyme, head rhyme, initial rhyme |
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| alliterator | (noun) a speaker or writer who makes use of alliteration | - |
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| almandite | (noun) a deep red garnet consisting of iron aluminum silicate | Synonyms: almandine |
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| alterability | (noun) the quality of being alterable | - |
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| altitude | (noun) elevation especially above sea level or above the earth's surface | Synonyms: height |
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| (noun) angular distance above the horizon (especially of a celestial object) | Synonyms: ALT, EL, elevation |
| (noun) the perpendicular distance from the base of a geometric figure to the opposite vertex (or side if parallel) | - |
| alveolitis | (noun) inflammation of the alveoli in the lungs caused by inhaling dust; with repeated exposure the condition may become chronic | - |
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| (noun) inflammation in the socket of a tooth; sometimes occurs after a tooth is extracted and a blood clot fails to form | Synonyms: dry socket |
| ambidexterity | (noun) the property of being equally skillful with each hand | Synonyms: ambidextrousness |
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| ambiguity | (noun) unclearness by virtue of having more than one meaning | Synonyms: equivocalness |
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| (noun) an expression whose meaning cannot be determined from its context | - |
| ambit | (noun) an area in which something acts or operates or has power or control: | Synonyms: compass, orbit, range, reach, scope |
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| ambition | (noun) a strong drive for success | Synonyms: ambitiousness |
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| (noun) a cherished desire | Synonyms: aspiration, dream |
| ambitiousness | (noun) a strong drive for success | Synonyms: ambition |
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| amblygonite | (noun) a white or grey mineral consisting of lithium aluminum phosphate; a source of lithium | - |
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| amenability | (noun) the trait of being cooperative | Synonyms: amenableness, cooperativeness |
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| amenities | (noun) things that make you comfortable and at ease | Synonyms: comforts, conveniences, creature comforts |
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| amenity | (noun) pleasantness resulting from agreeable conditions | Synonyms: agreeableness |
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| amiability | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, affableness, amiableness, bonhomie, geniality |
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| (noun) a cheerful and agreeable mood | Synonyms: good humor, good humour, good temper |
| amicability | (noun) having a disposition characterized by warmth and friendliness | Synonyms: amicableness |
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| (noun) a disinclination to quarrel | Synonyms: amicableness |
| amitosis | (noun) the direct method of cell division characterized by simple division of the nucleus without formation of chromosomes | - |
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| amitriptyline | (noun) a tricyclic antidepressant drug (trade name Elavil) with serious side effects; interacts with many other medications | Synonyms: amitriptyline hydrochloride, Elavil |
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| amity | (noun) a cordial disposition | Synonyms: cordiality |
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| (noun) a state of friendship and cordiality | - |
| ammonite | (noun) one of the coiled chambered fossil shells of extinct mollusks | Synonyms: ammonoid |
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| ammunition | (noun) projectiles to be fired from a gun | Synonyms: ammo |
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| (noun) information that can be used to attack or defend a claim or argument or viewpoint | - |
| (noun) any nuclear or chemical or biological material that can be used as a weapon of mass destruction | - |
| amobarbital | (noun) a barbiturate with sedative and hypnotic effects; used to relieve insomnia and as an anticonvulsant | - |
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| amorality | (noun) the quality of being amoral | - |
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| amphibolite | (noun) a metamorphic rock composed chiefly of amphibole and plagioclase | - |
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| amphitheater | (noun) an oval large stadium with tiers of seats; an arena in which contests and spectacles are held | Synonyms: amphitheatre, coliseum |
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| (noun) a sloping gallery with seats for spectators (as in an operating room or theater) | Synonyms: amphitheatre |
| amphitheatre | (noun) an oval large stadium with tiers of seats; an arena in which contests and spectacles are held | Synonyms: amphitheater, coliseum |
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| (noun) a sloping gallery with seats for spectators (as in an operating room or theater) | Synonyms: amphitheater |
| amplitude | (noun) greatness of magnitude | - |
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| (noun) the property of copious abundance | Synonyms: bountifulness, bounty |
| (noun) (physics) the maximum displacement of a periodic wave | - |
| analyticity | (noun) the property of being analytic | - |
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| anatotitan | (noun) one of the largest and most famous duck-billed dinosaurs | - |
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| anchorite | (noun) one retired from society for religious reasons | Synonyms: hermit |
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| andesite | (noun) a dark grey volcanic rock | - |
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| andradite | (noun) a garnet consisting of calcium iron silicate and having any color ranging from yellow and green to brown and black; used as gemstone | - |
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| angiitis | (noun) inflammation of a blood vessel or lymph duct | - |
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| angularity | (noun) the property possessed by a shape that has angles | - |
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| (noun) a shape having one or more sharp angles | Synonyms: angular shape |
| animality | (noun) the physical (or animal) side of a person as opposed to the spirit or intellect | Synonyms: animal nature |
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