| alloy | (noun) the state of impairing the quality or reducing the value of something | Synonyms: admixture |
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| (noun) a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten | Synonyms: metal |
| ally | (noun) a friendly nation | - |
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| (noun) an associate who provides cooperation or assistance | Synonyms: friend |
| alterability | (noun) the quality of being alterable | - |
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| 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 | - |
| ambivalency | (noun) mixed feelings or emotions | Synonyms: ambivalence |
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| ambulatory | (noun) a covered walkway (as in a cloister) | - |
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| amenability | (noun) the trait of being cooperative | Synonyms: amenableness, cooperativeness |
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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 |
| amity | (noun) a cordial disposition | Synonyms: cordiality |
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| (noun) a state of friendship and cordiality | - |
| amnesty | (noun) the formal act of liberating someone | Synonyms: free pardon, pardon |
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| (noun) a warrant granting release from punishment for an offense | Synonyms: pardon |
| (noun) a period during which offenders are exempt from punishment | - |
| amorality | (noun) the quality of being amoral | - |
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| amphibology | (noun) an ambiguous grammatical construction; e.g., `they are flying planes' can mean either that someone is flying planes or that something is flying planes | Synonyms: amphiboly |
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| amphiboly | (noun) an ambiguous grammatical construction; e.g., `they are flying planes' can mean either that someone is flying planes or that something is flying planes | Synonyms: amphibology |
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| amphictyony | (noun) an association of neighboring states or tribes in ancient Greece; established originally to defend a common religious center | - |
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| amphidiploidy | (noun) the condition of being amphidiploid | - |
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| amphigory | (noun) nonsensical writing (usually verse) | Synonyms: nonsense verse |
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| amygdalotomy | (noun) psychosurgery in which amygdaloid fibers that mediate limbic system activity are severed (in cases of extreme uncontrollable violence) | - |
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| amyotrophy | (noun) progressive wasting of muscle tissues | Synonyms: amyotrophia |
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| anaglyphy | (noun) the process of producing pictures in contrasting colors that appear three-dimensional when superimposed and viewed through spectacles with one red and one green lens | - |
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| analogy | (noun) drawing a comparison in order to show a similarity in some respect | - |
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| (noun) an inference that if things agree in some respects they probably agree in others | - |
| (noun) the religious belief that between creature and creator no similarity can be found so great but that the dissimilarity is always greater; any analogy between God and humans will always be inadequate | Synonyms: doctrine of analogy |
| analyticity | (noun) the property of being analytic | - |
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| anaplasty | (noun) surgery concerned with therapeutic or cosmetic reformation of tissue | Synonyms: plastic surgery, reconstructive surgery |
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| anarchy | (noun) a state of lawlessness and disorder (usually resulting from a failure of government) | Synonyms: lawlessness |
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| anatomy | (noun) a detailed analysis | - |
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| (noun) alternative names for the body of a human being | Synonyms: bod, build, chassis, figure, flesh, form, frame, human body, material body, physical body, physique, shape, soma |
| (noun) the branch of morphology that deals with the structure of animals | Synonyms: general anatomy |
| ancestry | (noun) inherited properties shared with others of your bloodline | Synonyms: derivation, filiation, lineage |
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| (noun) the hereditary derivation of an individual | Synonyms: blood, blood line, bloodline, descent, line, line of descent, lineage, origin, parentage, pedigree, stemma, stock |
| anchovy | (noun) small herring-like plankton-eating fishes often canned whole or as paste; abundant in tropical waters worldwide | - |
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| (noun) tiny fishes usually canned or salted; used for hors d'oeuvres or as seasoning in sauces | - |
| androgeny | (noun) male parthenogenesis in which the embryo contains only paternal chromosomes due to the failure of the egg nucleus to participate in fertilization | Synonyms: androgenesis |
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| androgyny | (noun) showing characteristics of both sexes | Synonyms: bisexuality, hermaphroditism |
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| anemography | (noun) recording anemometrical measurements | - |
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| anemometry | (noun) measuring wind speed and direction | - |
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| anencephaly | (noun) a defect in brain development resulting in small or missing brain hemispheres | Synonyms: anencephalia |
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| anergy | (noun) reduction or lack of an immune response to a specific antigen | - |
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| (noun) inactivity and lack of energy | - |
| anesthesiology | (noun) the branch of medical science that studies and applies anesthetics | - |
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| aneuploidy | (noun) an abnormality involving a chromosome number that is not an exact multiple of the haploid number (one chromosome set is incomplete) | - |
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| angelology | (noun) the branch of theology that is concerned with angels | - |
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| angiography | (noun) roentgenographic examination of blood vessels after injection of a radiopaque contrast medium; produces an angiogram | - |
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| angiology | (noun) the branch of medical science that studies the blood and lymph vessels and their disorders | - |
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| angiopathy | (noun) any disease of the blood vessels or lymph ducts | - |
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| angioplasty | (noun) an operation to repair a damaged blood vessel or unblock a coronary artery | - |
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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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| animosity | (noun) a feeling of ill will arousing active hostility | Synonyms: animus, bad blood |
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| anisogamy | (noun) (biology) reproduction by the union or fusion of two differing gametes (especially differing in size) | - |
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| anisotropy | (noun) the property of being anisotropic; having a different value when measured in different directions | - |
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| anniversary | (noun) the date on which an event occurred in some previous year (or the celebration of it) | Synonyms: day of remembrance |
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| annualry | (noun) the third finger (especially of the left hand) | Synonyms: ring finger |
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| annuity | (noun) income from capital investment paid in a series of regular payments | Synonyms: rente |
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| anomaly | (noun) (astronomy) position of a planet as defined by its angular distance from its perihelion (as observed from the sun) | - |
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| (noun) a person who is unusual | Synonyms: unusual person |
| (noun) deviation from the normal or common order or form or rule | Synonyms: anomalousness |
| anomy | (noun) lack of moral standards in a society | Synonyms: anomie |
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| (noun) personal state of isolation and anxiety resulting from a lack of social control and regulation | Synonyms: anomie |
| anonymity | (noun) the state of being anonymous | Synonyms: namelessness |
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| anorthography | (noun) a loss of the ability to write or to express thoughts in writing because of a brain lesion | Synonyms: agraphia, logagraphia |
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| answerability | (noun) responsibility to someone or for some activity | Synonyms: accountability, answerableness |
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| antecedency | (noun) preceding in time | Synonyms: antecedence, anteriority, precedence, precedency, priority |
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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 |
| anthology | (noun) a collection of selected literary passages | - |
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| anthropocentricity | (noun) an inclination to evaluate reality exclusively in terms of human values | Synonyms: anthropocentrism |
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| anthropogeny | (noun) the evolution or genesis of the human race | Synonyms: anthropogenesis |
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| anthropolatry | (noun) the worship of human beings | Synonyms: worship of man |
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| anthropology | (noun) the social science that studies the origins and social relationships of human beings | - |
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| anthropometry | (noun) measurement and study of the human body and its parts and capacities | - |
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| anthropophagy | (noun) human cannibalism; the eating of human flesh | - |
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| anthroposophy | (noun) a system of beliefs and practices based on the philosophy of Rudolf Steiner; it claims to integrate the practical and psychological in child-centered education | - |
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| antibody | (noun) any of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes, thus producing an immune response | - |
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| antimony | (noun) a metallic element having four allotropic forms; used in a wide variety of alloys; found in stibnite | Synonyms: atomic number 51, Sb |
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| antinomy | (noun) a contradiction between two statements that seem equally reasonable | - |
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| antipathy | (noun) the object of a feeling of intense aversion; something to be avoided | - |
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| (noun) a feeling of intense dislike | Synonyms: aversion, distaste |
| antiphonary | (noun) bound collection of antiphons | Synonyms: antiphonal |
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| antiphony | (noun) alternate (responsive) singing by a choir in two parts | - |
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| (noun) a verse or song to be chanted or sung in response | Synonyms: antiphon |
| antiquary | (noun) an expert or collector of antiquities | Synonyms: antiquarian, archaist |
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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 | - |
| antonymy | (noun) the semantic relation that holds between two words that can (in a given context) express opposite meanings | - |
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| anxiety | (noun) a vague unpleasant emotion that is experienced in anticipation of some (usually ill-defined) misfortune | - |
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| (noun) (psychiatry) a relatively permanent state of worry and nervousness occurring in a variety of mental disorders, usually accompanied by compulsive behavior or attacks of panic | Synonyms: anxiousness |
| apathy | (noun) the trait of lacking enthusiasm for or interest in things generally | Synonyms: indifference, numbness, spiritlessness |
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| (noun) an absence of emotion or enthusiasm | - |
| apery | (noun) the act of mimicking; imitative behavior | Synonyms: mimicry |
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| apiary | (noun) a shed containing a number of beehives | Synonyms: bee house |
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| apogamy | (noun) (botany) development of an embryo without fertilization; especially the development in some ferns of a sporophyte from the gametophyte without fertilization | - |
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| apology | (noun) a poor example | Synonyms: excuse |
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| (noun) an expression of regret at having caused trouble for someone | - |
| (noun) a formal written defense of something you believe in strongly | Synonyms: apologia |
| apoplexy | (noun) a sudden loss of consciousness resulting when the rupture or occlusion of a blood vessel leads to oxygen lack in the brain | Synonyms: cerebrovascular accident, CVA, stroke |
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| apostasy | (noun) the act of abandoning a party for cause | Synonyms: tergiversation |
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| (noun) the state of having rejected your religious beliefs for your political party or a cause (often in favor of opposing beliefs or causes) | Synonyms: defection, renunciation |
| apothecary | (noun) a health professional trained in the art of preparing and dispensing drugs | Synonyms: chemist, druggist, pharmacist, pill pusher, pill roller |
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| apparency | (noun) the property of being apparent | Synonyms: apparentness |
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| appendectomy | (noun) surgical removal of the vermiform appendix | Synonyms: appendicectomy |
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| appendicectomy | (noun) surgical removal of the vermiform appendix | Synonyms: appendectomy |
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| appetency | (noun) a feeling of craving something | Synonyms: appetence, 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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| approachability | (noun) the attribute of being easy to meet or deal with | Synonyms: accessibility |
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| arability | (noun) the quality of land that is appropriate for cultivation | - |
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| arborolatry | (noun) the worship of trees | Synonyms: tree-worship |
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| archaeology | (noun) the branch of anthropology that studies prehistoric people and their cultures | Synonyms: archeology |
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| archdeaconry | (noun) the territorial jurisdiction of an archdeacon | - |
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| archduchy | (noun) the domain controlled by an archduke or archduchess | - |
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| archeology | (noun) the branch of anthropology that studies prehistoric people and their cultures | Synonyms: archaeology |
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| archery | (noun) the sport of shooting arrows with a bow | - |
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| archway | (noun) a passageway under a curved masonry construction | Synonyms: arch |
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| areaway | (noun) a passageway between buildings or giving access to a basement | - |
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| argosy | (noun) one or more large merchant ships | - |
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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 |