| abbacy | (noun) the jurisdiction or office of an abbot | - |
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| abbey | (noun) a monastery ruled by an abbot | - |
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| (noun) a convent ruled by an abbess | - |
| (noun) a church associated with a monastery or convent | - |
| abdominoplasty | (noun) cosmetic surgery of the abdomen to remove wrinkles and tighten the skin over the stomach | Synonyms: tummy tuck |
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| aberrancy | (noun) a state or condition markedly different from the norm | Synonyms: aberrance, aberration, deviance |
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| abhenry | (noun) a unit of inductance equal to one billionth of a henry | - |
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| 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 |
| abiotrophy | (noun) a loss of vitality and a degeneration of cells and tissues not due to any apparent injury | - |
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| abnormalcy | (noun) an abnormal physical condition resulting from defective genes or developmental deficiencies | Synonyms: abnormality |
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| 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 |
| absorbency | (noun) the property of being absorbent | - |
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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 |
| academy | (noun) a learned establishment for the advancement of knowledge | - |
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| (noun) a secondary school (usually private) | - |
| (noun) a school for special training | - |
| (noun) an institution for the advancement of art or science or literature | Synonyms: honorary society |
| acceptability | (noun) satisfactoriness by virtue of conforming to approved standards | Synonyms: acceptableness |
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| accessary | (noun) someone who helps another person commit a crime | Synonyms: accessory |
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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 |
| accessory | (noun) a supplementary component that improves capability | Synonyms: add-on, appurtenance, supplement |
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| (noun) clothing that is worn or carried, but not part of your main clothing | Synonyms: accouterment, accoutrement |
| (noun) someone who helps another person commit a crime | Synonyms: accessary |
| 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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| accountancy | (noun) the occupation of maintaining and auditing records and preparing financial reports for a business | Synonyms: accounting |
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| accuracy | (noun) the quality of being near to the true value | Synonyms: truth |
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| (noun) (mathematics) the number of significant figures given in a number | - |
| acephaly | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalia, acephalism |
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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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| achondroplasty | (noun) an inherited skeletal disorder beginning before birth; cartilage is converted to bone resulting in dwarfism | Synonyms: achondroplasia, chondrodystrophy, osteosclerosis congenita |
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| achromaticity | (noun) the visual property of being without chromatic color | Synonyms: achromatism, colorlessness, colourlessness |
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| acidimetry | (noun) volumetric analysis using standard solutions of acids to measure the amount of a base present | - |
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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 |
| 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 | - |
| acrimony | (noun) a rough and bitter manner | Synonyms: acerbity, bitterness, jaundice, tartness, thorniness |
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| acrocephaly | (noun) a congenital abnormality of the skull; the top of the skull assumes a cone shape | Synonyms: oxycephaly |
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| acromegaly | (noun) enlargement of bones of hands and feet and face; often accompanied by headache and muscle pain and emotional disturbances; caused by overproduction of growth hormone by the anterior pituitary gland (due to a tumor) | Synonyms: acromegalia |
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| acrophony | (noun) naming a letter of the alphabet by using a word whose initial sound is the sound represented by that letter | - |
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| actinometry | (noun) measuring the intensity of electromagnetic radiation (especially of the sun's rays) | - |
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| actinotherapy | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: irradiation, radiation, radiation therapy, radiotherapy |
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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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| actuary | (noun) someone versed in the collection and interpretation of numerical data (especially someone who uses statistics to calculate insurance premiums) | Synonyms: statistician |
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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 |
| adactyly | (noun) congenital absence of fingers and/or toes | Synonyms: adactylia, adactylism |
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| adaptability | (noun) the ability to change (or be changed) to fit changed circumstances | - |
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| adenoidectomy | (noun) surgical removal of the adenoids; commonly performed along with tonsillectomy | - |
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| adenomegaly | (noun) gland enlargement | - |
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| adenopathy | (noun) a glandular disease or enlargement of glandular tissue (especially of the lymph glands) | - |
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| adequacy | (noun) the quality of being able to meet a need satisfactorily: | Synonyms: adequateness |
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| (noun) the quality of being sufficient for the end in view | Synonyms: sufficiency |
| adhocracy | (noun) an organization with little or no structure | - |
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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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| adjacency | (noun) the attribute of being so near as to be touching | Synonyms: contiguity, contiguousness |
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| admirability | (noun) admirable excellence | Synonyms: admirableness, wonderfulness |
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| admiralty | (noun) the office of admiral | - |
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| (noun) the department in charge of the navy (as in Great Britain) | - |
| admissibility | (noun) acceptability by virtue of being admissible | - |
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| adorability | (noun) extreme attractiveness | Synonyms: adorableness |
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| adoxography | (noun) fine writing in praise of trivial or base subjects | - |
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| adrenalectomy | (noun) surgical removal of one or both adrenal glands | Synonyms: suprarenalectomy |
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| adultery | (noun) extramarital sex that willfully and maliciously interferes with marriage relations | Synonyms: criminal conversation, fornication |
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| adversary | (noun) someone who offers opposition | Synonyms: antagonist, opponent, opposer, resister |
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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 |
| advertency | (noun) the process of being heedful | Synonyms: advertence |
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| advisability | (noun) the quality of being advisable | - |
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| advisory | (noun) an announcement that usually advises or warns the public of some threat | - |
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| advocacy | (noun) active support of an idea or cause etc.; especially the act of pleading or arguing for something | Synonyms: protagonism |
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| aerology | (noun) meteorology of the total extent of the atmosphere; especially the upper layers | - |
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| aerophilately | (noun) the collection and study of airmail stamps | - |
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| aery | (noun) any habitation at a high altitude | Synonyms: aerie, eyrie, eyry |
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| (noun) the lofty nest of a bird of prey (such as a hawk or eagle) | Synonyms: aerie, eyrie, eyry |
| aetiology | (noun) the philosophical study of causation | Synonyms: etiology |
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| (noun) the cause of a disease | Synonyms: etiology |
| affability | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affableness, amiability, amiableness, bonhomie, geniality |
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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 |
| affray | (noun) a noisy fight | Synonyms: disturbance, fray, ruffle |
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| (noun) noisy quarrel | Synonyms: altercation, fracas |
| agency | (noun) to have the ability to produce a particular effect or achieve an end | Synonyms: means, way |
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| (noun) an administrative unit of government | Synonyms: authority, bureau, federal agency, government agency, office |
| (noun) a business or organization that provides a particular service, especially the mediation of transactions between two parties | - |
| (noun) the state of serving as an official and authorized delegate or agent | Synonyms: delegacy, representation |
| (noun) the state of being in action or exerting power | - |
| agility | (noun) the gracefulness of a person or animal that is quick and nimble | Synonyms: legerity, lightness, lightsomeness, nimbleness |
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| agony | (noun) intense feelings of suffering; acute mental or physical pain | Synonyms: torment, torture |
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| (noun) a state of acute pain | Synonyms: excruciation, suffering |
| agreeability | (noun) a temperamental disposition to be agreeable | Synonyms: agreeableness |
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| agrimony | (noun) a plant of the genus Agrimonia having spikelike clusters of small yellow flowers | Synonyms: agrimonia |
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| agrobiology | (noun) the study of plant nutrition and growth especially as a way to increase crop yield | - |
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| agrology | (noun) science of soils in relation to crops | - |
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| agronomy | (noun) the application of soil and plant sciences to land management and crop production | Synonyms: scientific agriculture |
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| airway | (noun) a commercial enterprise that provides scheduled flights for passengers | Synonyms: airline, airline business |
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| (noun) a duct that provides ventilation (as in mines) | Synonyms: air duct, air passage |
| (noun) the passages through which air enters and leaves the body | Synonyms: respiratory tract |
| (noun) a designated route followed by airplanes in flying from one airport to another | Synonyms: air lane, flight path, skyway |
| alacrity | (noun) liveliness and eagerness | Synonyms: briskness, smartness |
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| alchemy | (noun) a pseudoscientific forerunner of chemistry in medieval times | - |
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| (noun) the way two individuals relate to each other | Synonyms: chemistry, interpersonal chemistry |
| alderfly | (noun) dark-colored insect having predaceous aquatic larvae | Synonyms: alder fly, Sialis lutaria |
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| algidity | (noun) prostration characterized by cold and clammy skin and low blood pressure | - |
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| algology | (noun) the branch of botany that studies algae | Synonyms: phycology |
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| algometry | (noun) measuring sensitivity to pain or pressure | - |
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| alimony | (noun) court-ordered support paid by one spouse to another after they are separated | Synonyms: maintenance |
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| alkalimetry | (noun) volumetric analysis using standard solutions of alkali to measure the amount of acid present | - |
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| alkalinity | (noun) pH values above 7 | - |
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| alky | (noun) a person who drinks alcohol to excess habitually | Synonyms: alcoholic, boozer, dipsomaniac, lush, soaker, souse |
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| allegory | (noun) a short moral story (often with animal characters) | Synonyms: apologue, fable, parable |
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| (noun) an expressive style that uses fictional characters and events to describe some subject by suggestive resemblances; an extended metaphor | - |
| (noun) a visible symbol representing an abstract idea | Synonyms: emblem |
| allergology | (noun) the branch of medical science that studies the causes and treatment of allergies | - |
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| allergy | (noun) hypersensitivity reaction to a particular allergen; symptoms can vary greatly in intensity | Synonyms: allergic reaction |
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| alley | (noun) a narrow street with walls on both sides | Synonyms: alleyway, back street |
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| (noun) a lane down which a bowling ball is rolled toward pins | Synonyms: bowling alley, skittle alley |
| alleyway | (noun) a narrow street with walls on both sides | Synonyms: alley, back street |
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| alloantibody | (noun) an antibody that occurs naturally against foreign tissues from a person of the same species | Synonyms: isoantibody |
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| allogamy | (noun) cross-fertilization in plants | - |
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| allometry | (noun) the study of the relative growth of a part of an organism in relation to the growth of the whole | - |
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| allopathy | (noun) the usual method of treating disease with remedies that produce effects differing from those produced by the disease itself | - |
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| allopatry | (noun) the occurrence of related organisms in separate geographical areas with no overlap | - |
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| allotropy | (noun) the phenomenon of an element existing in two or more physical forms | Synonyms: allotropism |
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