| affably | (adverb) in an affable manner | Synonyms: amiably, genially |
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| affectedly | (adverb) in an affected manner | - |
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| affectingly | (adverb) in a poignant or touching manner | Synonyms: poignantly, touchingly |
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| affectionately | (adverb) with affection | Synonyms: dear, dearly |
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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 |
| affirmatively | (adverb) in an affirmative manner | - |
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| affirmatory | (adjective) affirming or giving assent | Synonyms: affirmative |
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| 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 | - |
| aggravatingly | (adverb) in an aggravating fashion | - |
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| aggressively | (adverb) in an aggressive manner | Synonyms: sharply |
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| agilely | (adverb) in a nimble or agile manner; with quickness and lightness and ease | Synonyms: nimbly |
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| agility | (noun) the gracefulness of a person or animal that is quick and nimble | Synonyms: legerity, lightness, lightsomeness, nimbleness |
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| agonizingly | (adverb) in a very painful manner | Synonyms: excruciatingly, torturously |
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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 |
| agranulocytic | (adjective) relating to the blood disorder of agranulocytosis | - |
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| agranulocytosis | (noun) an acute blood disorder (often caused by radiation or drug therapy) characterized by severe reduction in granulocytes | Synonyms: agranulosis, granulocytopenia |
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| agreeability | (noun) a temperamental disposition to be agreeable | Synonyms: agreeableness |
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| agreeably | (adverb) in an enjoyable manner | Synonyms: enjoyably, pleasantly |
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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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| agrypnia | (noun) a vigil before certain feasts (as e.g. Easter) | - |
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| agrypnotic | (adjective) of or pertaining to agrypnia | - |
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| aimlessly | (adverb) without aim; in an aimless manner | - |
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| airily | (adverb) in a flippant manner | Synonyms: flippantly |
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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 |
| airworthy | (adjective) (of aircraft) fit to fly | - |
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| airy | (adjective) characterized by lightness and insubstantiality; as impalpable or intangible as air | Synonyms: aerial, aeriform, aery, ethereal |
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| (adjective) having little or no perceptible weight; so light as to resemble air | - |
| (adjective) not practical or realizable; speculative | Synonyms: impractical, Laputan, visionary, windy |
| (adjective) open to or abounding in fresh air | Synonyms: aired |
| akaryocyte | (noun) a cell without a nucleus (as an erythrocyte) | Synonyms: acaryote, akaryote |
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| akaryote | (noun) a cell without a nucleus (as an erythrocyte) | Synonyms: acaryote, akaryocyte |
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| alacrity | (noun) liveliness and eagerness | Synonyms: briskness, smartness |
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| alarmingly | (adverb) in an alarming manner | - |
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| alary | (adjective) having or resembling wings | Synonyms: alar, aliform, wing-shaped |
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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 |
| aldehyde | (noun) any of a class of highly reactive chemical compounds; used in making resins and dyes and organic acids | - |
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| aldehydic | (adjective) of or related to or containing aldehydes | - |
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| alderfly | (noun) dark-colored insect having predaceous aquatic larvae | Synonyms: alder fly, Sialis lutaria |
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| aldermanly | (adjective) of or relating to or like an alderman | Synonyms: aldermanic |
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| aleatory | (adjective) dependent on chance | - |
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| alertly | (adverb) in mentally perceptive and responsive way | - |
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| algebraically | (adverb) in an algebraic manner | - |
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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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| alimentary | (adjective) of or providing nourishment | Synonyms: alimental, nourishing, nutrient, nutritious, nutritive |
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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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| aliyah | (noun) (Judaism) immigration of Jews to Israel | - |
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| (noun) (Judaism) the honor of being called up to the reading desk in the synagogue to read from the Torah | - |
| alkalify | (verb) turn basic and less acidic | Synonyms: alkalise, alkalize, basify |
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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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| alkyd | (noun) a durable synthetic resin widely used in adhesives and paints | Synonyms: alkyd resin |
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| alkyl | (noun) any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons | Synonyms: alkyl group, alkyl radical |
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| alkylbenzene | (noun) organic compound that has an alkyl group bound to a benzene ring | - |
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| alkylbenzenesulfonate | (noun) sulfonate of alkyl benzene | - |
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| alkylic | (adjective) of or related to an alkyl | - |
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| alkyne | (noun) a colorless flammable gas used chiefly in welding and in organic synthesis | Synonyms: acetylene, ethyne |
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| allay | (verb) satisfy (thirst) | Synonyms: assuage, quench, slake |
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| (verb) lessen the intensity of or calm | Synonyms: ease, relieve, still |
| allayer | (noun) a person who reduces the intensity (e.g., of fears) and calms and pacifies | Synonyms: comforter, reliever |
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| allegedly | (adverb) according to what has been alleged | - |
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| allegorically | (adverb) in an allegorical manner | - |
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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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| alleviatory | (adjective) moderating pain or sorrow by making it easier to bear | Synonyms: alleviative, lenitive, mitigative, mitigatory, palliative |
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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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| alliteratively | (adverb) in an alliterative manner | - |
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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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| allowably | (adverb) in a permissible manner | Synonyms: permissibly |
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| 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 |
| (verb) lower in value by increasing the base-metal content | Synonyms: debase |
| (verb) make an alloy of | - |
| alloyed | (adjective) (used of metals) blended to obtain a desired property | - |
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| (adjective) (used of metals) debased by mixture with an inferior element | - |
| ally | (noun) a friendly nation | - |
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| (noun) an associate who provides cooperation or assistance | Synonyms: friend |
| (verb) become an ally or associate, as by a treaty or marriage | - |
| allyl | (noun) the univalent unsaturated organic radical C3H5; derived from propylene | Synonyms: allyl group, allyl radical |
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| allylic | (adjective) of or pertaining to the allyl radical | - |
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| almighty | (adjective) having unlimited power | Synonyms: all-powerful, omnipotent |
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| alphabetically | (adverb) in alphabetical order | - |
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| already | (adverb) prior to a specified or implied time | - |
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| alterability | (noun) the quality of being alterable | - |
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| alternately | (adverb) in an alternating sequence or position | - |
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| alternatively | (adverb) in place of, or as an alternative to | Synonyms: instead, or else |
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| altruistically | (adverb) in an altruistic manner | Synonyms: selflessly |
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| always | (adverb) at all times; all the time and on every occasion | Synonyms: e'er, ever |
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| (adverb) forever; throughout all time | - |
| (adverb) at any time or in any event | - |
| (adverb) invariably | Synonyms: constantly, forever, incessantly, perpetually |
| (adverb) without variation or change, in every case | Synonyms: constantly, invariably |
| alyssum | (noun) any garden plant of the genus Alyssum having clusters of small yellow or white flowers | Synonyms: madwort |
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| amaryllis | (noun) bulbous plant having showy white to reddish flowers | - |
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| amateurishly | (adverb) in an amateurish manner | - |
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| amatory | (adjective) expressive of or exciting sexual love or romance | Synonyms: amorous, romantic |
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| amazingly | (adverb) in an amazing manner; to everyone's surprise | Synonyms: astonishingly, surprisingly |
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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 | - |
| ambiguously | (adverb) in an ambiguous manner | Synonyms: equivocally |
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| ambitiously | (adverb) with ambition; in an ambitious and energetic manner | Synonyms: determinedly |
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| ambivalency | (noun) mixed feelings or emotions | Synonyms: ambivalence |
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