| acidification | (noun) the process of becoming acid or being converted into an acid | - |
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| affiant | (noun) a person who makes an affidavit | - |
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| affidavit | (noun) written declaration made under oath; a written statement sworn to be true before someone legally authorized to administer an oath | - |
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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 | - |
| 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 |
| affine | (noun) (anthropology) kin by marriage | - |
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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 |
| affirmation | (noun) a judgment by a higher court that the judgment of a lower court was correct and should stand | - |
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| (noun) a statement asserting the existence or the truth of something | Synonyms: avouchment, avowal |
| (noun) (religion) a solemn declaration that serves the same purpose as an oath (if an oath is objectionable to the person on religious or ethical grounds) | - |
| (noun) the act of affirming or asserting or stating something | Synonyms: assertion, statement |
| affirmative | (noun) a reply of affirmation | - |
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| affirmativeness | (noun) the agreeable quality of one who assents | - |
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| affirmer | (noun) someone who claims to speak the truth | Synonyms: asserter, asseverator, avower, declarer |
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| affix | (noun) a linguistic element added to a word to produce an inflected or derived form | - |
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| affixation | (noun) formation of a word by means of an affix | - |
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| (noun) the act of attaching or affixing something | Synonyms: attachment |
| (noun) the result of adding an affix to a root word | - |
| afibrinogenemia | (noun) the absence of fibrinogen in the plasma leading to prolonged bleeding | - |
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| aficionado | (noun) a serious devotee of some particular music genre or musical performer | - |
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| (noun) a fan of bull fighting | - |
| airfield | (noun) a place where planes take off and land | Synonyms: field, flying field, landing field |
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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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| alligatorfish | (noun) small very elongate sea poachers | Synonyms: Aspidophoroides monopterygius |
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| amberfish | (noun) any of several amber to coppery fork-tailed warm-water carangid fishes | Synonyms: amberjack |
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| ammonification | (noun) impregnation with ammonia or a compound of ammonia | - |
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| amplification | (noun) (electronics) the act of increasing voltage or power or current | - |
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| (noun) addition of extra material or illustration or clarifying detail | Synonyms: elaboration |
| (noun) the amount of increase in signal power or voltage or current expressed as the ratio of output to input | Synonyms: gain |
| amplifier | (noun) electronic equipment that increases strength of signals passing through it | - |
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| angelfish | (noun) sharks with broad flat bodies and winglike pectoral fins but that swim the way sharks do | Synonyms: angel shark, monkfish, Squatina squatina |
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| (noun) a butterfly fish of the genus Pomacanthus | - |
| (noun) deep-bodied disk-shaped food fish of warmer western Atlantic coastal waters | Synonyms: Chaetodipterus faber, spadefish |
| anglerfish | (noun) fishes having large mouths with a wormlike filament attached for luring prey | Synonyms: allmouth, angler, angler fish, goosefish, Lophius Americanus, lotte, monkfish |
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| antefix | (noun) carved ornament at the eaves of a tile roof concealing the joints between tiles | - |
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| archerfish | (noun) any of several small freshwater fishes that catch insects by squirting water at them and knocking them into the water; found in Indonesia and Australia | Synonyms: Toxotes jaculatrix |
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| artifice | (noun) a deceptive maneuver (especially to avoid capture) | Synonyms: ruse |
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| artificer | (noun) a skilled worker who practices some trade or handicraft | Synonyms: artisan, craftsman, journeyman |
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| (noun) someone who is the first to think of or make something | Synonyms: discoverer, inventor |
| (noun) an enlisted man responsible for the upkeep of small arms and machine guns etc. | Synonyms: armorer, armourer |
| artificialism | (noun) Czech surrealism founded in 1928 by Jindrich Styrsky and Toyen (Marie Cerminova). | - |
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| artificiality | (noun) the quality of being produced by people and not occurring naturally | - |
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| backfield | (noun) the offensive football players who line up behind the linemen | - |
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| backfire | (noun) a miscalculation that recoils on its maker | Synonyms: boomerang |
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| (noun) a loud noise made by the explosion of fuel in the manifold or exhaust of an internal combustion engine | - |
| (noun) the backward escape of gases and unburned gunpowder after a gun is fired | Synonyms: blowback |
| (noun) a fire that is set intentionally in order to slow an approaching forest fire or grassfire by clearing a burned area in its path | - |
| balefire | (noun) a large outdoor fire that is lighted as a signal or in celebration | Synonyms: bonfire |
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| balloonfish | (noun) similar to but smaller than porcupinefish | Synonyms: Diodon holocanthus |
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| barrelfish | (noun) blackish fish of New England waters | Synonyms: black rudderfish, Hyperglyphe perciformis |
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| batfish | (noun) bottom-dweller of warm western Atlantic coastal waters having a flattened scaleless body that crawls about on fleshy pectoral and pelvic fins | - |
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| battlefield | (noun) a region where a battle is being (or has been) fought | Synonyms: battleground, field, field of battle, field of honor |
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| beatification | (noun) (Roman Catholic Church) an act of the Pope who declares that a deceased person lived a holy life and is worthy of public veneration; a first step toward canonization | - |
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| (noun) the action of rendering supremely blessed and extremely happy | - |
| (noun) a state of supreme happiness | Synonyms: beatitude, blessedness |
| beautification | (noun) the act of making something more beautiful | - |
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| benefice | (noun) an endowed church office giving income to its holder | Synonyms: ecclesiastical benefice |
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| beneficence | (noun) the quality of being kind or helpful or generous | - |
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| (noun) doing good; feeling beneficent | - |
| beneficiary | (noun) the semantic role of the intended recipient who benefits from the happening denoted by the verb in the clause | Synonyms: benefactive role |
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| (noun) the recipient of funds or other benefits | Synonyms: donee |
| beneficiation | (noun) crushing and separating ore into valuable substances or waste by any of a variety of techniques | Synonyms: mineral dressing, mineral extraction, mineral processing, ore dressing, ore processing |
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| benefit | (noun) something that aids or promotes well-being | Synonyms: welfare |
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| (noun) a performance to raise money for a charitable cause | - |
| (noun) financial assistance in time of need | - |
| billfish | (noun) giant warm-water game fish having a prolonged and rounded toothless upper jaw | - |
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| (noun) elongate European surface-dwelling predacious fishes with long toothed jaws; abundant in coastal waters | Synonyms: gar, needlefish |
| (noun) primitive predaceous North American fish covered with hard scales and having long jaws with needlelike teeth | Synonyms: gar, garfish, garpike, Lepisosteus osseus |
| (noun) slender long-beaked fish of temperate Atlantic waters | Synonyms: saury, Scomberesox saurus |
| blackfish | (noun) female salmon that has recently spawned | - |
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| (noun) small dark-colored whale of the Atlantic coast of the United States; the largest male acts as pilot or leader for the school | Synonyms: black whale, common blackfish, Globicephala melaena, pilot whale |
| (noun) large dark-colored food fish of the Atlantic coast of North America | Synonyms: tautog, Tautoga onitis |
| blowfish | (noun) any of numerous marine fishes whose elongated spiny body can inflate itself with water or air to form a globe; several species contain a potent nerve poison; closely related to spiny puffers | Synonyms: globefish, puffer, pufferfish |
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| (noun) delicacy that is highly dangerous because of a potent nerve poison in ovaries and liver | Synonyms: puffer, pufferfish, sea squab |
| bluefin | (noun) largest tuna; to 1500 pounds; of mostly temperate seas: feed in polar regions but breed in tropics | Synonyms: bluefin tuna, horse mackerel, Thunnus thynnus |
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| (noun) flesh of very large tuna | Synonyms: bluefin tuna |
| bluefish | (noun) bluish warm-water marine food and game fish that follow schools of small fishes into shallow waters | Synonyms: Pomatomus saltatrix |
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| (noun) fatty bluish flesh of bluefish | - |
| boarfish | (noun) fish with a projecting snout | Synonyms: Capros aper |
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| (noun) fish with large eyes and long snouts | - |
| boffin | (noun) (British slang) a scientist or technician engaged in military research | - |
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| bonefish | (noun) slender silvery marine fish found in tropical mud flats and mangrove lagoons | Synonyms: Albula vulpes |
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| bonfire | (noun) a large outdoor fire that is lighted as a signal or in celebration | Synonyms: balefire |
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| bowfin | (noun) primitive long-bodied carnivorous freshwater fish with a very long dorsal fin; found in sluggish waters of North America | Synonyms: Amia calva, dogfish, grindle |
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| boxfish | (noun) any of numerous small tropical fishes having body and head encased in bony plates | Synonyms: trunkfish |
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| brickfield | (noun) a place where bricks are made and sold | Synonyms: brickyard |
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| briefing | (noun) detailed instructions, as for a military operation | - |
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| buffalofish | (noun) any of several large suckers of the Mississippi valley | Synonyms: buffalo fish |
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| (noun) large carp-like North American fish | - |
| bullfight | (noun) a Spanish or Portuguese or Latin American spectacle; a matador baits and (usually) kills a bull in an arena before many spectators | Synonyms: corrida |
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| bullfighter | (noun) someone who fights bulls | Synonyms: toreador |
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| bullfighting | (noun) the activity at a bullfight | Synonyms: tauromachy |
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| bullfinch | (noun) common European finch mostly black and white with red throat and breast | Synonyms: Pyrrhula pyrrhula |
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| bunfight | (noun) (Briticism) a grand formal party on an important occasion | Synonyms: bun-fight |
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| burrfish | (noun) any of several fishes having rigid flattened spines | - |
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| butterfingers | (noun) someone who drops things (especially one who cannot catch a ball) | - |
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| butterfish | (noun) small marine fish with a short compressed body and feeble spines | Synonyms: stromateid, stromateid fish |
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| (noun) slippery scaleless food fish of the northern Atlantic coastal waters | Synonyms: Pholis gunnellus, rock gunnel |
| (noun) any of numerous small flat Atlantic food fish having smooth skin | - |
| butterflyfish | (noun) tropical fish with huge fanlike pectoral fins for underwater gliding; unrelated to searobins | Synonyms: flying gurnard, flying robin |
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| calcification | (noun) a process that impregnates something with calcium (or calcium salts) | - |
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| (noun) tissue hardened by deposition of lime salts | - |
| (noun) an inflexible and unchanging state | - |
| campfire | (noun) a small outdoor fire for warmth or cooking (as at a camp) | - |
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| canafistola | (noun) deciduous or semi-evergreen tree having scented sepia to yellow flowers in drooping racemes and pods whose pulp is used medicinally; tropical Asia and Central and South America and Australia | Synonyms: canafistula, Cassia fistula, drumstick tree, golden shower tree, pudding pipe tree, purging cassia |
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| canafistula | (noun) deciduous or semi-evergreen tree having scented sepia to yellow flowers in drooping racemes and pods whose pulp is used medicinally; tropical Asia and Central and South America and Australia | Synonyms: canafistola, Cassia fistula, drumstick tree, golden shower tree, pudding pipe tree, purging cassia |
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| canfield | (noun) a form of solitaire that involves gambling | - |
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| caprifig | (noun) wild variety of the common fig used to facilitate pollination of certain figs | Synonyms: Ficus carica sylvestris |
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| cardinalfish | (noun) small red fishes of coral reefs and inshore tropical waters | - |
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| cartilaginification | (noun) abnormal formation of cartilage from other tissues; observed in some Asians | - |
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| catfish | (noun) any of numerous mostly freshwater bottom-living fishes of Eurasia and North America with barbels like whiskers around the mouth | Synonyms: siluriform fish |
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| (noun) large ferocious northern deep-sea food fishes with strong teeth and no pelvic fins | Synonyms: wolf fish, wolffish |
| (noun) flesh of scaleless food fish of the southern United States; often farmed | Synonyms: mudcat |
| centerfield | (noun) the fielding position of the player on a baseball team who is expected to field balls in the central third of the outfield | Synonyms: center field |
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| (noun) the piece of ground in the outfield directly ahead of the catcher | Synonyms: center, center field, centre |
| centerfielder | (noun) the person who plays center field | Synonyms: center fielder |
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| certificate | (noun) a document attesting to the truth of certain stated facts | Synonyms: certification, credential, credentials |
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| (noun) a formal declaration that documents a fact of relevance to finance and investment; the holder has a right to receive interest or dividends | Synonyms: security |
| certification | (noun) the act of certifying or bestowing a franchise on | Synonyms: enfranchisement |
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| (noun) validating the authenticity of something or someone | Synonyms: authentication |
| (noun) confirmation that some fact or statement is true through the use of documentary evidence | Synonyms: corroboration, documentation |
| (noun) a document attesting to the truth of certain stated facts | Synonyms: certificate, credential, credentials |
| chaffinch | (noun) small European finch with a cheerful song | Synonyms: Fringilla coelebs |
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| chafing | (noun) soreness or irritation of the skin caused by friction | - |
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| chenfish | (noun) small silvery marine food fish found off California | Synonyms: Genyonemus lineatus, kingfish, white croaker |
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| chesterfield | (noun) a fitted overcoat with a velvet collar | - |
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| (noun) an overstuffed davenport with upright armrests | - |
| cigarfish | (noun) small fusiform fish of western Atlantic | Synonyms: Decapterus punctatus, quiaquia, round scad |
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| clarification | (noun) the act of removing solid particles from a liquid | Synonyms: clearing |
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| (noun) an interpretation that removes obstacles to understanding | Synonyms: elucidation, illumination |
| classification | (noun) the act of distributing things into classes or categories of the same type | Synonyms: assortment, categorisation, categorization, compartmentalisation, compartmentalization |
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| (noun) restriction imposed by the government on documents or weapons that are available only to certain authorized people | - |
| (noun) the basic cognitive process of arranging into classes or categories | Synonyms: categorisation, categorization, sorting |
| (noun) a group of people or things arranged by class or category | Synonyms: categorisation, categorization |
| classified | (noun) a short ad in a newspaper or magazine (usually in small print) and appearing along with other ads of the same type | Synonyms: classified ad, classified advertisement |
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| classifier | (noun) an algorithm that implements classification. | - |
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| (noun) a word or morpheme used in some languages in certain contexts (such as counting) to indicate the semantic class to which the counted item belongs | - |
| (noun) a person who creates classifications | - |
| clingfilm | (noun) a thin plastic film made of saran (trade name Saran Wrap) that sticks to itself; used for wrapping food | Synonyms: cling film, Saran Wrap |
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| clingfish | (noun) very small (to 3 inches) flattened marine fish with a sucking disc on the abdomen for clinging to rocks etc. | - |
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| clofibrate | (noun) a drug (trade name Atromid-S) that reduces lipids in the blood serum; used to treat some cardiovascular diseases | Synonyms: Atromid-S |
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| coalfield | (noun) a region where there is coal underground | - |
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| cockfight | (noun) a match in a cockpit between two fighting cocks heeled with metal gaffs | - |
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| cockfighting | (noun) participation in the sport of matching gamecocks in a cockfight | - |
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| codfish | (noun) major food fish of Arctic and cold-temperate waters | Synonyms: cod |
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| (noun) lean white flesh of important North Atlantic food fish; usually baked or poached | Synonyms: cod |
| codification | (noun) the act of codifying; arranging in a systematic order | - |
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| (noun) a set of rules or principles or laws (especially written ones) | Synonyms: code |
| coefficient | (noun) a constant number that serves as a measure of some property or characteristic | - |
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| coffin | (noun) box in which a corpse is buried or cremated | Synonyms: casket |
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