| 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 |
| abseil | (noun) (mountaineering) a descent of a vertical cliff or wall made by using a doubled rope that is fixed to a higher point and wrapped around the body | Synonyms: rappel |
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| (verb) descend by means of a rappel | Synonyms: rappel, rope down |
| abseiler | (noun) a person who descends down a nearly vertical face by using a doubled rope that is wrapped around the body and attached to some high point | Synonyms: rappeller |
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| 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 |
| accountability | (noun) responsibility to someone or for some activity | Synonyms: answerability, answerableness |
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| acetanilid | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilide, phenylacetamide |
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| acetanilide | (noun) a solid odourless chemical of leaf or flake-like appearance; used in rubber accelerator, dye, and camphor synthesis; metabolised to paracetamol (acetaminophen) | Synonyms: acetanilid, phenylacetamide |
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| achievability | (noun) the state of being achievable | Synonyms: attainability, attainableness |
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| achillea | (noun) any of several plants of the genus Achillea native to Europe and having small white flowers in flat-topped flower heads | - |
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| acidophil | (noun) an organism that thrives in a relatively acid environment | Synonyms: acidophile |
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| acidophile | (noun) an organism that thrives in a relatively acid environment | Synonyms: acidophil |
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| acidophilic | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilous, aciduric |
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| acidophilous | (adjective) especially of some bacteria; growing well in an acid medium | Synonyms: acidophilic, aciduric |
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| acidophilus | (noun) a bacterium that is used to make yogurt and to supplement probiotics | Synonyms: Lactobacillus acidophilus |
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| acrylonitrile | (noun) a colorless liquid unsaturated nitrile made from propene | Synonyms: propenonitrile, vinyl cyanide |
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| adaptability | (noun) the ability to change (or be changed) to fit changed circumstances | - |
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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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| adorability | (noun) extreme attractiveness | Synonyms: adorableness |
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| advisability | (noun) the quality of being advisable | - |
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| aerofoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: airfoil, control surface, surface |
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| aerophilatelic | (adjective) of or relating to airmail stamps | - |
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| aerophilately | (noun) the collection and study of airmail stamps | - |
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| aerophile | (noun) a lover of aviation | - |
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| aerophilic | (adjective) depending on free oxygen or air | Synonyms: aerobic, aerophilous |
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| aerophilous | (adjective) depending on free oxygen or air | Synonyms: aerobic, aerophilic |
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| afebrile | (adjective) having no fever | - |
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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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| affiliate | (noun) a subsidiary or subordinate organization that is affiliated with another organization | - |
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| (noun) a subordinate or subsidiary associate; a person who is affiliated with another or with an organization | - |
| (verb) join in an affiliation | - |
| (verb) keep company with; hang out with | Synonyms: associate, assort, consort |
| affiliated | (adjective) being joined in close association | Synonyms: attached, connected |
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| affiliation | (noun) the act of becoming formally connected or joined | - |
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| (noun) a social or business relationship | Synonyms: association, tie-up, tie |
| agile | (adjective) moving quickly and lightly | Synonyms: nimble, quick, spry |
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| (adjective) mentally quick | Synonyms: nimble |
| 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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| agnail | (noun) a loose narrow strip of skin near the base of a fingernail; tearing it produces a painful sore that is easily infected | Synonyms: hangnail |
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| agreeability | (noun) a temperamental disposition to be agreeable | Synonyms: agreeableness |
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| aiguillette | (noun) ornamental tagged cord or braid on the shoulder of a uniform | Synonyms: aglet, aiglet |
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| ail | (noun) aromatic bulb used as seasoning | Synonyms: garlic |
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| (verb) be ill or unwell | - |
| (verb) cause bodily suffering to and make sick or indisposed | Synonyms: pain, trouble |
| ailanthus | (noun) any of several deciduous Asian trees of the genus Ailanthus | - |
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| aileron | (noun) an airfoil that controls lateral motion | - |
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| ailing | (adjective) somewhat ill or prone to illness | Synonyms: indisposed, peaked, poorly, seedy, sickly, under the weather, unwell |
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| ailment | (noun) an often persistent bodily disorder or disease; a cause for complaining | Synonyms: complaint, ill |
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| ailurophobia | (noun) a morbid fear of cats | - |
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| airfoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: aerofoil, control surface, surface |
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| airily | (adverb) in a flippant manner | Synonyms: flippantly |
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| airmail | (noun) a system of conveying mail by aircraft | Synonyms: airpost |
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| (noun) letters and packages that are transported by aircraft | - |
| (verb) send or transport by airmail | - |
| airmailer | (noun) a mailer for airmail | - |
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| alfilaria | (noun) European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage | Synonyms: alfileria, clocks, Erodium cicutarium, filaree, filaria, pin clover, pin grass, redstem storksbill |
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| alfileria | (noun) European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage | Synonyms: alfilaria, clocks, Erodium cicutarium, filaree, filaria, pin clover, pin grass, redstem storksbill |
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| algarobilla | (noun) mesquite pod used in tanning and dyeing | Synonyms: algarroba, algarrobilla |
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| algarrobilla | (noun) mesquite pod used in tanning and dyeing | Synonyms: algarobilla, algarroba |
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| algophilia | (noun) sexual pleasure derived from inflicting or experiencing pain | Synonyms: algolagnia |
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| alhamdulilah | (noun) An expression meaning 'praise God' in Arabic | - |
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| alterability | (noun) the quality of being alterable | - |
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| amenability | (noun) the trait of being cooperative | Synonyms: amenableness, cooperativeness |
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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 |
| amoxicillin | (noun) an antibiotic; a semisynthetic oral penicillin (trade names Amoxil and Larotid and Polymox and Trimox and Augmentin) used to treat bacterial infections | Synonyms: Amoxil, Augmentin, Larotid, Polymox, Trimox |
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| ampicillin | (noun) semisynthetic penicillin (trade names Principen and Polycillin and SK-Ampicillin) | Synonyms: Polycillin, Principen, SK-Ampicillin |
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| ancillary | (adjective) furnishing added support | Synonyms: accessory, adjunct, adjuvant, appurtenant, auxiliary |
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| anemophilous | (adjective) of flowering plants (especially grasses etc) that are pollinated by the wind | - |
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| angiohemophilia | (noun) a form of hemophilia discovered by Erik von Willebrand; a genetic disorder that is inherited as an autosomal recessive trait; characterized by a deficiency of the coagulation factor and by mucosal bleeding | Synonyms: vascular hemophilia, von Willebrand's disease |
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| anglophil | (noun) an admirer of England and things English | Synonyms: anglophile |
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| anglophile | (noun) an admirer of England and things English | Synonyms: anglophil |
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| angrily | (adverb) with anger | - |
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| anil | (noun) shrub of West Indies and South America that is a source of indigo dye | Synonyms: Indigofera anil, Indigofera suffruticosa |
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| (noun) a blue dye obtained from plants or made synthetically | Synonyms: indigo, indigotin |
| anile | (adjective) of or like a feeble old woman | - |
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| aniline | (noun) oily poisonous liquid amine obtained from nitrobenzene and used to make dyes and plastics and medicines | Synonyms: aminobenzine, aniline oil, phenylamine |
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| annihilate | (verb) kill in large numbers | Synonyms: carry off, decimate, eliminate, eradicate, extinguish, wipe out |
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| annihilated | (adjective) destroyed completely | Synonyms: exterminated, wiped out |
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| annihilating | (adjective) wreaking or capable of wreaking complete destruction | Synonyms: annihilative, devastating, withering |
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| (adjective) making light of | Synonyms: devastating, withering |
| annihilation | (noun) destruction by annihilating something | Synonyms: obliteration |
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| (noun) total destruction | Synonyms: disintegration |
| annihilative | (adjective) wreaking or capable of wreaking complete destruction | Synonyms: annihilating, devastating, withering |
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| annihilator | (noun) a total destroyer | - |
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| answerability | (noun) responsibility to someone or for some activity | Synonyms: accountability, answerableness |
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| antediluvial | (adjective) of or relating to the period before the biblical flood | Synonyms: antediluvian |
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| antediluvian | (adjective) of or relating to the period before the biblical flood | Synonyms: antediluvial |
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| (adjective) so extremely old as seeming to belong to an earlier period | Synonyms: antiquated, archaic |
| (noun) a very old person | Synonyms: ancient |
| (noun) any of the early patriarchs who lived prior to the Noachian deluge | Synonyms: antediluvian patriarch |
| anthill | (noun) a mound of earth made by ants as they dig their nest | Synonyms: formicary |
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| anthophilous | (adjective) feeding on flowers | Synonyms: anthophagous |
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| antiepileptic | (noun) a drug used to treat or prevent convulsions (as in epilepsy) | Synonyms: anticonvulsant, anticonvulsant drug, antiepileptic drug |
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| antifertility | (adjective) capable of preventing conception or impregnation | Synonyms: contraceptive, prophylactic |
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| antifertilizin | (noun) An immunologically specific substance produced by animal sperm to implement attraction by the egg before fertilization. | - |
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| antilepton | (noun) the antiparticle of a lepton | - |
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| antilog | (noun) the number of which a given number is the logarithm | Synonyms: antilogarithm |
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| antilogarithm | (noun) the number of which a given number is the logarithm | Synonyms: antilog |
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| antilogism | (noun) an inconsistent triad of propositions in logic of which two are premises of a valid syllogism while the third is the contradictory of its conclusion. | - |
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| antisyphilitic | (noun) a drug (or other chemical agent) that is effective against syphilis | - |
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| anvil | (noun) a heavy block of iron or steel on which hot metals are shaped by hammering | - |
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| (noun) a small bone in the middle ear between the malleus and the stapes | Synonyms: incus |
| 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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| aquilege | (noun) a plant of the genus Aquilegia having irregular showy spurred flowers; north temperate regions especially mountains | Synonyms: aquilegia, columbine |
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| aquilegia | (noun) a plant of the genus Aquilegia having irregular showy spurred flowers; north temperate regions especially mountains | Synonyms: aquilege, columbine |
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| aquiline | (adjective) curved down like an eagle's beak | Synonyms: hooked |
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| arability | (noun) the quality of land that is appropriate for cultivation | - |
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| arbitrarily | (adverb) in a random manner | Synonyms: at random, every which way, haphazardly, indiscriminately, randomly, willy-nilly |
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| archil | (noun) any of various lecanoras that yield the dye archil | Synonyms: orchil |
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| (noun) a purplish dye obtained from orchil lichens | Synonyms: cudbear, orchil |
| argil | (noun) a white clay (especially a white clay used by potters) | - |
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| argillaceous | (adjective) resembling or containing clay | Synonyms: clayey |
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| argillite | (noun) a sedimentary rock differing from shale in being bound by silica and from slate in having no slate cleavages | - |
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