| allopatric | (adjective) (of biological species or speciation) occurring in areas isolated geographically from one another | - |
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| allopatry | (noun) the occurrence of related organisms in separate geographical areas with no overlap | - |
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| allophone | (noun) (linguistics) any of various acoustically different forms of the same phoneme | - |
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| allophonic | (adjective) pertaining to allophones | - |
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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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| allosaur | (noun) late Jurassic carnivorous dinosaur; similar to but somewhat smaller than tyrannosaurus | Synonyms: allosaurus |
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| allosaurus | (noun) late Jurassic carnivorous dinosaur; similar to but somewhat smaller than tyrannosaurus | Synonyms: allosaur |
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| allot | (verb) allow to have | Synonyms: accord, grant |
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| (verb) give out | Synonyms: assign, portion |
| (verb) administer or bestow, as in small portions | Synonyms: administer, deal, deal out, dish out, dispense, distribute, dole out, lot, mete out, parcel out, shell out |
| 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 |
| allotrope | (noun) a structurally different form of an element | - |
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| allotropic | (adjective) of or related to or exhibiting allotropism | Synonyms: allotropical |
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| allotropical | (adjective) of or related to or exhibiting allotropism | Synonyms: allotropic |
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| allotropism | (noun) the phenomenon of an element existing in two or more physical forms | Synonyms: allotropy |
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| allotropy | (noun) the phenomenon of an element existing in two or more physical forms | Synonyms: allotropism |
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| allotted | (adjective) given as a task | - |
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| allover | (adjective) covering the entire surface | - |
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| allow | (verb) allow or plan for a certain possibility; concede the truth or validity of something | Synonyms: take into account |
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| (verb) give or assign a resource to a particular person or cause | Synonyms: appropriate, earmark, reserve, set aside |
| (verb) consent to, give permission; permit | Synonyms: countenance, let, permit |
| (verb) allow the presence of or allow (an activity) without opposing or prohibiting | Synonyms: permit, tolerate |
| (verb) let have | Synonyms: grant |
| (verb) grant as a discount or in exchange | - |
| (verb) make it possible through a specific action or lack of action for something to happen | Synonyms: let, permit |
| (verb) allow the other (baseball) team to score | Synonyms: give up |
| (verb) make a possibility or provide opportunity for; permit to be attainable or cause to remain | Synonyms: allow for, leave, provide |
| (verb) afford possibility | Synonyms: admit |
| allowable | (adjective) that may be permitted especially as according to rule | Synonyms: permissible |
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| (adjective) deserving to be allowed or considered | - |
| (adjective) deductible according to the tax laws | - |
| allowably | (adverb) in a permissible manner | Synonyms: permissibly |
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| 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 |
| (verb) put on a fixed allowance, as of food | - |
| 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 | - |
| allspice | (noun) ground dried berrylike fruit of a West Indian allspice tree; suggesting combined flavors of cinnamon and nutmeg and cloves | - |
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| (noun) aromatic West Indian tree that produces allspice berries | Synonyms: allspice tree, Pimenta dioica, pimento tree |
| (noun) deciduous shrubs having aromatic bark; eastern China; southwestern and eastern United States | - |
| allude | (verb) make a more or less disguised reference to | Synonyms: advert, touch |
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| allure | (noun) the power to entice or attract through personal charm | Synonyms: allurement, temptingness |
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| (verb) dispose or incline or entice to | Synonyms: tempt |
| 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 | - |
| alluring | (adjective) highly attractive and able to arouse hope or desire | Synonyms: beguiling, enticing, tempting |
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| allusion | (noun) passing reference or indirect mention | - |
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| allusive | (adjective) characterized by indirect references | - |
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| allusiveness | (noun) a quality characterized by indirect reference | - |
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| alluvial | (adjective) of or relating to alluvium | - |
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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 | - |
| alluvium | (noun) clay or silt or gravel carried by rushing streams and deposited where the stream slows down | Synonyms: alluvial deposit, alluvial sediment, alluvion |
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| 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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| alphabetically | (adverb) in alphabetical order | - |
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| altruistically | (adverb) in an altruistic manner | Synonyms: selflessly |
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| amorally | (adverb) without regard for morality | Synonyms: immorally |
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| amorphophallus | (noun) any plant of the genus Amorphophallus | - |
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| anachronistically | (adverb) in an anachronistic manner | - |
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| analytically | (adverb) by virtue of analysis | - |
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| anarchically | (adverb) in a lawless rebellious manner | - |
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| anatomically | (adverb) with respect to anatomy | - |
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| angelically | (adverb) like an angel | - |
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| anisotropically | (adverb) in an anisotropic manner | - |
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| annually | (adverb) without missing a year | Synonyms: each year, every year, yearly |
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| (adverb) by the year; every year (usually with reference to a sum of money paid or received) | Synonyms: each year, p.a., per annum, per year |
| antagonistically | (adverb) in an antagonistic manner | - |
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| antiparallel | (adjective) (especially of vectors) parallel but oppositely directed | - |
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| antithetically | (adverb) with antithesis; in an antithetical manner | - |
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| apathetically | (adverb) in an apathetic manner | - |
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| apologetically | (adverb) in an apologetic manner | - |
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| appall | (verb) strike with disgust or revulsion | Synonyms: appal, offend, outrage, scandalise, scandalize, shock |
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| (verb) fill with apprehension or alarm; cause to be unpleasantly surprised | Synonyms: alarm, appal, dismay, horrify |
| appalled | (adjective) struck with fear, dread, or consternation | Synonyms: aghast, dismayed, shocked |
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| appalling | (adjective) causing consternation | Synonyms: dismaying |
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| (noun) an experience that appalls | - |
| appallingly | (adverb) to an appalling extent | - |
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| archipallium | (noun) the olfactory cortex of the cerebrum | Synonyms: paleocortex |
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| architecturally | (adverb) with regard to architecture | - |
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| aristocratically | (adverb) in an aristocratic manner | - |
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| arithmetically | (adverb) with respect to arithmetic | - |
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| artificially | (adverb) not according to nature; not by natural means | Synonyms: by artificial means, unnaturally |
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| artistically | (adverb) in an artistic manner | - |
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| ascetically | (adverb) in an ascetic manner | - |
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| asexually | (adverb) in an asexual manner | - |
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| astronomically | (adverb) enormously | - |
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| asymmetrically | (adverb) in an asymmetrical manner | Synonyms: unsymmetrically |
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| asymptotically | (adverb) toward an asymptote | - |
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| atonally | (adverb) without tonality | - |
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| atypically | (adverb) in a manner that is not typical | Synonyms: untypically |
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| aurally | (adverb) with regard to sound or the ear | - |
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| authentically | (adverb) genuinely; with authority | Synonyms: genuinely |
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| autocratically | (adverb) in an autocratic manner | - |
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| (adverb) in an overbearingly domineering manner; as a dictator | Synonyms: dictatorially, magisterially |
| automatically | (adverb) in a reflex manner | - |
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| (adverb) in a mechanical manner; by a mechanism | Synonyms: mechanically |
| axially | (adverb) with respect to an axis | - |
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| axiomatically | (adverb) on the basis of axioms | - |
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| bacterially | (adverb) by bacteria | - |
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| ball | (noun) a pitch that is not in the strike zone | - |
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| (noun) a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs | Synonyms: baseball, baseball game |
| (noun) round object that is hit or thrown or kicked in games | - |
| (noun) a spherical object used as a plaything | - |
| (noun) a solid projectile that is shot by a musket | Synonyms: musket ball |
| (noun) a more or less rounded anatomical body or mass | - |
| (noun) one of the two male reproductive glands that produce spermatozoa and secrete androgens | Synonyms: ballock, bollock, egg, nut, orchis, testicle, testis |
| (noun) a lavish dance requiring formal attire | Synonyms: formal |
| (noun) a compact mass | Synonyms: chunk, clod, clump, glob, lump |
| (noun) an object with a spherical shape | Synonyms: globe, orb |
| (verb) form into a ball by winding or rolling | - |
| (verb) to live very well | - |
| ballad | (noun) a narrative poem of popular origin | Synonyms: lay |
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| (noun) a narrative song with a recurrent refrain | Synonyms: lay |
| ballade | (noun) a poem consisting of 3 stanzas and an envoy | - |
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| balladeer | (noun) a singer of popular ballads | Synonyms: crooner |
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| ballast | (noun) any heavy material used to stabilize a ship or airship | - |
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| (noun) an electrical device for starting and regulating fluorescent and discharge lamps | Synonyms: light ballast |
| (noun) a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations) | Synonyms: ballast resistor, barretter |
| (noun) an attribute that tends to give stability in character and morals; something that steadies the mind or feelings | - |
| (noun) coarse gravel laid to form a bed for streets and railroads | - |
| (verb) make steady with a ballast | - |
| ballcock | (noun) floating ball that controls level in a water tank | Synonyms: ball cock |
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| balldress | (noun) a suit or dress for formal occasions | - |
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| ballerina | (noun) a female ballet dancer | Synonyms: danseuse |
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| ballet | (noun) a theatrical representation of a story that is performed to music by trained dancers | Synonyms: concert dance |
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| (noun) music written for a ballet | - |
| balletic | (adjective) characteristic of or resembling or suitable for ballet | - |
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| balletomane | (noun) a ballet enthusiast | - |
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| balletomania | (noun) extraordinary enthusiasm for ballets | - |
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| ballgame | (noun) a field game played with a ball (especially baseball) | Synonyms: ball game |
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| (noun) a particular situation that is radically different from the preceding situation | Synonyms: new ballgame |
| ballista | (noun) ancient missile weapon that throws bolts or stones | Synonyms: bolt thrower |
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| ballistic | (adjective) relating to or characteristic of the motion of objects moving under their own momentum and the force of gravity | - |
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| ballistics | (noun) the science of flight dynamics | - |
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| (noun) the trajectory of an object in free flight | Synonyms: ballistic trajectory |
| ballistocardiogram | (noun) a graphical recording made by a ballistocardiograph | - |
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| ballistocardiograph | (noun) a medical instrument that measures the mechanical force of cardiac contractions and the amount of blood passing through the heart during a specified period by measuring the recoil of the body as blood is pumped from the ventricles | Synonyms: cardiograph |
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| ballock | (noun) one of the two male reproductive glands that produce spermatozoa and secrete androgens | Synonyms: ball, bollock, egg, nut, orchis, testicle, testis |
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| balloon | (noun) large tough nonrigid bag filled with gas or heated air | - |
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| (noun) small thin inflatable rubber bag with narrow neck | - |
| (verb) become inflated | Synonyms: billow, inflate |
| (verb) ride in a hot-air balloon | - |
| balloonfish | (noun) similar to but smaller than porcupinefish | Synonyms: Diodon holocanthus |
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| ballooning | (noun) flying in a balloon | - |
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| balloonist | (noun) someone who flies a balloon | - |
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