| allergen | (noun) any substance that can cause an allergy | - |
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| alleviant | (noun) remedy that alleviates pain without curing | Synonyms: alleviator, palliative |
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| alleviation | (noun) the act of reducing something unpleasant (as pain or annoyance) | Synonyms: easement, easing, relief |
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| (noun) the feeling that comes when something burdensome is removed or reduced | Synonyms: assuagement, relief |
| alliance | (noun) the act of forming an alliance or confederation | Synonyms: confederation |
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| (noun) a formal agreement establishing an association or alliance between nations or other groups to achieve a particular aim | - |
| (noun) an organization of people (or countries) involved in a pact or treaty | Synonyms: alignment, alinement, coalition |
| (noun) a connection based on kinship or marriage or common interest | Synonyms: bond |
| (noun) the state of being allied or confederated | Synonyms: confederation |
| 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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| alloantibody | (noun) an antibody that occurs naturally against foreign tissues from a person of the same species | Synonyms: isoantibody |
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| allocation | (noun) the act of distributing by allotting or apportioning; distribution according to a plan | Synonyms: allotment, apportioning, apportionment, assignation, parceling, parcelling |
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| (noun) (computer science) the assignment of particular areas of a magnetic disk to particular data or instructions | Synonyms: storage allocation |
| (noun) a share set aside for a specific purpose | Synonyms: allotment |
| allocution | (noun) (rhetoric) a formal or authoritative address that advises or exhorts | - |
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| allophone | (noun) (linguistics) any of various acoustically different forms of the same phoneme | - |
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| allopurinol | (noun) a drug (trade name Zyloprim) used to treat gout and other conditions in which there is an excessive buildup of uric acid | Synonyms: Zyloprim |
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| allotment | (noun) the act of distributing by allotting or apportioning; distribution according to a plan | Synonyms: allocation, apportioning, apportionment, assignation, parceling, parcelling |
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| (noun) a share set aside for a specific purpose | Synonyms: allocation |
| allowance | (noun) the act of allowing | - |
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| (noun) a permissible difference; allowing some freedom to move within limits | Synonyms: leeway, margin, tolerance |
| (noun) an amount allowed or granted (as during a given period) | - |
| (noun) an amount added or deducted on the basis of qualifying circumstances | Synonyms: adjustment |
| (noun) a sum granted as reimbursement for expenses | - |
| (noun) a reserve fund created by a charge against profits in order to provide for changes in the value of a company's assets | Synonyms: allowance account, valuation account, valuation reserve |
| allurement | (noun) the act of enticing a person to do something wrong (as an offer of sex in return for money) | Synonyms: solicitation |
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| (noun) the power to entice or attract through personal charm | Synonyms: allure, temptingness |
| (noun) attractiveness | - |
| allusion | (noun) passing reference or indirect mention | - |
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| allusiveness | (noun) a quality characterized by indirect reference | - |
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| alluviation | (noun) the phenomenon of sediment or gravel accumulating | Synonyms: deposit, sedimentation |
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| alluvion | (noun) clay or silt or gravel carried by rushing streams and deposited where the stream slows down | Synonyms: alluvial deposit, alluvial sediment, alluvium |
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| (noun) the rising of a body of water and its overflowing onto normally dry land | Synonyms: deluge, flood, inundation |
| (noun) gradual formation of new land, by recession of the sea or deposit of sediment | - |
| almanac | (noun) an annual publication containing tabular information in a particular field or fields arranged according to the calendar of a given year | - |
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| (noun) an annual publication including weather forecasts and other miscellaneous information arranged according to the calendar of a given year | Synonyms: farmer's calendar |
| almandine | (noun) a purple variety of the ruby spinel | - |
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| (noun) a deep red garnet consisting of iron aluminum silicate | Synonyms: almandite |
| almandite | (noun) a deep red garnet consisting of iron aluminum silicate | Synonyms: almandine |
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| almond | (noun) oval-shaped edible seed of the almond tree | - |
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| (noun) small bushy deciduous tree native to Asia and North Africa having pretty pink blossoms and highly prized edible nuts enclosed in a hard green hull; cultivated in southern Australia and California | Synonyms: Amygdalus communis, Prunus amygdalus, Prunus dulcis, sweet almond |
| almoner | (noun) an official in a British hospital who looks after the social and material needs of the patients | Synonyms: medical social worker |
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| almsgiving | (noun) making voluntary contributions to aid the poor | Synonyms: alms-giving |
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| aloneness | (noun) a disposition toward being alone | Synonyms: loneliness, lonesomeness, solitariness |
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| aloofness | (noun) a disposition to be distant and unsympathetic in manner | Synonyms: remoteness, standoffishness, withdrawnness |
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| (noun) indifference by personal withdrawal | Synonyms: distance |
| alpenstock | (noun) a stout staff with a metal point; used by mountain climbers | - |
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| alphabetisation | (noun) the act of putting in alphabetical order | Synonyms: alphabetization |
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| alphabetization | (noun) the act of putting in alphabetical order | Synonyms: alphabetisation |
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| alphanumerics | (noun) a character set that includes letters and digits and punctuation | Synonyms: alphanumeric characters |
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| alpinist | (noun) a mountain climber who specializes in difficult climbs | - |
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| alsatian | (noun) breed of large shepherd dogs used in police work and as a guide for the blind | Synonyms: German police dog, German shepherd, German shepherd dog |
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| altcoin | (noun) an alternative cryptocurrency | - |
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| alteration | (noun) the act of revising or altering (involving reconsideration and modification) | Synonyms: revision |
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| (noun) the act of making something different (as e.g. the size of a garment) | Synonyms: adjustment, modification |
| (noun) an event that occurs when something passes from one state or phase to another | Synonyms: change, modification |
| altercation | (noun) noisy quarrel | Synonyms: affray, fracas |
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| altering | (noun) the sterilization of an animal | Synonyms: fixing, neutering |
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| alternate | (noun) someone who takes the place of another person | Synonyms: replacement, surrogate |
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| alternation | (noun) successive change from one thing or state to another and back again | - |
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| alternative | (noun) one of a number of things from which only one can be chosen | Synonyms: choice, option |
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| alternator | (noun) an old term for an electric generator that produces alternating current (especially in automobiles) | - |
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| alumina | (noun) any of various forms of aluminum oxide occurring naturally as corundum | Synonyms: aluminium oxide, aluminum oxide |
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| aluminate | (noun) a compound of alumina and a metallic oxide | - |
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| aluminium | (noun) a silvery ductile metallic element found primarily in bauxite | Synonyms: Al, aluminum, atomic number 13 |
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| aluminum | (noun) a silvery ductile metallic element found primarily in bauxite | Synonyms: Al, aluminium, atomic number 13 |
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| alumna | (noun) a female person who has received a degree from a school (high school or college or university) | - |
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| alumnus | (noun) a male person who has received a degree from a school (high school or college or university) | - |
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| alundum | (noun) a substance made of fused alumina | - |
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| amalgamation | (noun) the combination of two or more commercial companies | Synonyms: merger, uniting |
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| amanuensis | (noun) someone skilled in the transcription of speech (especially dictation) | Synonyms: shorthand typist, stenographer |
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| amaranth | (noun) any of various plants of the genus Amaranthus having dense plumes of green or red flowers; often cultivated for food | - |
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| (noun) seed of amaranth plants used as a native cereal in Central and South America | - |
| amateurishness | (noun) something that demonstrates a lack of professional competency | - |
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| amativeness | (noun) the arousal of feelings of sexual desire | Synonyms: amorousness, eroticism, erotism, sexiness |
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| amatungulu | (noun) very large closely branched South African shrub having forked bright green spines and shiny leaves | Synonyms: Carissa grandiflora, Carissa macrocarpa, natal plum |
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| amazement | (noun) the feeling that accompanies something extremely surprising | Synonyms: astonishment |
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| amazon | (noun) mainly green tropical American parrots | - |
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| (noun) a large strong and aggressive woman | Synonyms: virago |
| ambiance | (noun) the atmosphere of an environment | Synonyms: ambience |
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| (noun) a particular environment or surrounding influence | Synonyms: ambience, atmosphere |
| ambidextrousness | (noun) the property of being equally skillful with each hand | Synonyms: ambidexterity |
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| ambience | (noun) the atmosphere of an environment | Synonyms: ambiance |
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| (noun) a particular environment or surrounding influence | Synonyms: ambiance, atmosphere |
| 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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| ambivalence | (noun) mixed feelings or emotions | Synonyms: ambivalency |
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| ambivalency | (noun) mixed feelings or emotions | Synonyms: ambivalence |
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| ambiversion | (noun) (psychology) a balanced disposition intermediate between extroversion and introversion | - |
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| amblygonite | (noun) a white or grey mineral consisting of lithium aluminum phosphate; a source of lithium | - |
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| amboyna | (noun) tree native to southeastern Asia having reddish wood with a mottled or striped black grain | Synonyms: padauk, padouk, Pterocarpus indicus |
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| (noun) mottled curly-grained wood of Pterocarpus indicus | Synonyms: Andaman redwood |
| ambulance | (noun) a vehicle that takes people to and from hospitals | - |
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| ambulation | (noun) walking about | - |
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| amelioration | (noun) the act of relieving ills and changing for the better | Synonyms: betterment, melioration |
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| amelogenesis | (noun) the developmental process of forming tooth enamel | - |
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| amenability | (noun) the trait of being cooperative | Synonyms: amenableness, cooperativeness |
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| amenableness | (noun) the trait of being cooperative | Synonyms: amenability, cooperativeness |
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| amendment | (noun) the act of amending or correcting | - |
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| (noun) a statement that is added to or revises or improves a proposal or document (a bill or constitution etc.) | - |
| amends | (noun) something done or paid in expiation of a wrong | Synonyms: reparation |
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| (noun) a sum of money paid in compensation for loss or injury | Synonyms: damages, indemnification, indemnity, redress, restitution |
| amenia | (noun) absence or suppression of normal menstrual flow | Synonyms: amenorrhea, amenorrhoea |
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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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| amenorrhea | (noun) absence or suppression of normal menstrual flow | Synonyms: amenia, amenorrhoea |
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| amenorrhoea | (noun) absence or suppression of normal menstrual flow | Synonyms: amenia, amenorrhea |
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| ament | (noun) a cylindrical spikelike inflorescence | Synonyms: catkin |
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| amentia | (noun) extreme mental retardation | Synonyms: idiocy |
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| amercement | (noun) money extracted as a penalty | Synonyms: fine, mulct |
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| amethopterin | (noun) toxic antimetabolite that limits cellular reproduction by acting as an antagonist to folic acid; used to treat certain cancers and psoriasis and rheumatoid arthritis | Synonyms: methotrexate, methotrexate sodium |
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| amiableness | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, affableness, amiability, bonhomie, geniality |
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| amicableness | (noun) having a disposition characterized by warmth and friendliness | Synonyms: amicability |
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| (noun) a disinclination to quarrel | Synonyms: amicability |
| amidopyrine | (noun) a white crystalline substance used as an analgesic and antipyretic | Synonyms: aminopyrine |
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| amine | (noun) a compound derived from ammonia by replacing hydrogen atoms by univalent hydrocarbon radicals | Synonyms: aminoalkane |
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| amino | (noun) the radical -NH2 | Synonyms: amino group |
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| aminoaciduria | (noun) abnormal presence of amino acids in the urine; usually a symptom of metabolic defects | - |
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| aminoalkane | (noun) a compound derived from ammonia by replacing hydrogen atoms by univalent hydrocarbon radicals | Synonyms: amine |
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| aminobenzine | (noun) oily poisonous liquid amine obtained from nitrobenzene and used to make dyes and plastics and medicines | Synonyms: aniline, aniline oil, phenylamine |
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| aminomethane | (noun) a methyl with the hydrogen atom replaced by an amino radical | - |
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| aminopherase | (noun) a class of transferases that catalyze transamination (that transfer an amino group from an amino acid to another compound) | Synonyms: aminotransferase, transaminase |
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| aminophylline | (noun) a theophylline derivative that is used as a bronchodilator in the treatment of bronchial asthma, emphysema, and bronchitis | - |
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| aminoplast | (noun) a plastic (synthetic resin) made from amino compounds; used as an adhesive and as a coating for paper and textiles | Synonyms: amino plastic, amino resin |
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| aminopyrine | (noun) a white crystalline substance used as an analgesic and antipyretic | Synonyms: amidopyrine |
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| aminotransferase | (noun) a class of transferases that catalyze transamination (that transfer an amino group from an amino acid to another compound) | Synonyms: aminopherase, transaminase |
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| amiodarone | (noun) an antiarrhythmic drug (trade name Cordarone) that has potentially fatal side effects and is used to control serious heart rhythm problems only when safer agents have been ineffective | Synonyms: Cordarone |
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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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| ammine | (noun) a complex inorganic compound that contains ammonia molecules | - |
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| ammonal | (noun) Ammonal is an explosive made up of ammonium nitrate and aluminum powder. | - |
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| ammonia | (noun) a pungent gas compounded of nitrogen and hydrogen (NH3) | - |
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| (noun) a water solution of ammonia | Synonyms: ammonia water, ammonium hydroxide |