| accelerando | (noun) a gradually increasing tempo of music | - |
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| acceleration | (noun) the act of accelerating; increasing the speed | Synonyms: quickening, speedup |
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| (noun) an increase in rate of change | - |
| (noun) (physics) a rate of increase of velocity | - |
| accelerator | (noun) a valve that regulates the supply of fuel to the engine | Synonyms: throttle, throttle valve |
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| (noun) a scientific instrument that increases the kinetic energy of charged particles | Synonyms: atom smasher, particle accelerator |
| (noun) a pedal that controls the throttle valve | Synonyms: accelerator pedal, gas, gas pedal, gun, throttle |
| (noun) (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected | Synonyms: catalyst |
| actinotherapy | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: irradiation, radiation, radiation therapy, radiotherapy |
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| adulterant | (noun) any substance that lessens the purity or effectiveness of a substance | Synonyms: adulterator |
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| adulteration | (noun) the act of adulterating (especially the illicit substitution of one substance for another) | - |
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| (noun) being mixed with extraneous material; the product of adulterating | Synonyms: debasement |
| adulterator | (noun) a changer who lessens the purity or effectiveness of a substance | - |
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| (noun) any substance that lessens the purity or effectiveness of a substance | Synonyms: adulterant |
| aeration | (noun) the act of charging a liquid with a gas making it effervescent | - |
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| (noun) the process of exposing to air (so as to purify) | - |
| aerator | (noun) an apparatus for exposing something to the air (as sewage) | - |
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| aerogenerator | (noun) generator that extracts usable energy from winds | Synonyms: wind generator, windmill |
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| agerasia | (noun) youthful appearance in an old person | - |
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| ageratum | (noun) any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers | - |
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| (noun) rhizomatous plant of central and southeastern United States and West Indies having large showy heads of clear blue flowers; sometimes placed in genus Eupatorium | Synonyms: Conoclinium coelestinum, Eupatorium coelestinum, mist-flower, mistflower |
| agglomerate | (noun) a collection of objects laid on top of each other | Synonyms: cumulation, cumulus, heap, mound, pile |
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| (noun) volcanic rock consisting of large fragments fused together | - |
| agglomeration | (noun) the act of collecting in a mass; the act of agglomerating | - |
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| (noun) a jumbled collection or mass | - |
| agglomerator | (noun) a device that causes material to gather into rounded balls | - |
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| aliterate | (noun) a person who can read but is disinclined to derive information from literary sources | Synonyms: aliterate person |
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| 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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| alliterator | (noun) a speaker or writer who makes use of alliteration | - |
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| alterability | (noun) the quality of being alterable | - |
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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 |
| 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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| 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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| amperage | (noun) the strength of an electrical current measured in amperes | - |
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| answerability | (noun) responsibility to someone or for some activity | Synonyms: accountability, answerableness |
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| answerableness | (noun) responsibility to someone or for some activity | Synonyms: accountability, answerability |
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| anticholinesterase | (noun) a medicine that inhibits cholinesterase by combining with it and so has a cholinergic effect | - |
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| aromatherapy | (noun) the therapeutic use of aromatic plant extracts and essential oils in baths or massage | - |
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| asseveration | (noun) a declaration that is made emphatically (as if no supporting evidence were necessary) | Synonyms: assertion, averment |
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| asseverator | (noun) someone who claims to speak the truth | Synonyms: affirmer, asserter, avower, declarer |
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| average | (noun) a statistic describing the location of a distribution | Synonyms: norm |
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| (noun) an intermediate scale value regarded as normal or usual | - |
| (noun) (sports) the ratio of successful performances to opportunities | - |
| averageness | (noun) ordinariness as a consequence of being average and not outstanding | Synonyms: mediocrity |
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| (noun) the state of being that is average; indicates normality but with connotations of mediocrity | - |
| azederach | (noun) tree of northern India and China having purple blossoms and small inedible yellow fruits; naturalized in the southern United States as a shade tree | Synonyms: azedarach, China tree, chinaberry, chinaberry tree, Melia azedarach, Melia azederach, Persian lilac, pride-of-India |
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| berating | (noun) a severe rebuke | Synonyms: blowing up |
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| beverage | (noun) any liquid suitable for drinking | Synonyms: drink, drinkable, potable |
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| bilateralism | (noun) the property of being symmetrical about a vertical plane | Synonyms: bilateral symmetry, bilaterality |
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| bilaterality | (noun) the property of being symmetrical about a vertical plane | Synonyms: bilateral symmetry, bilateralism |
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| boomerang | (noun) a miscalculation that recoils on its maker | Synonyms: backfire |
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| (noun) a curved piece of wood; when properly thrown will return to thrower | Synonyms: throw stick, throwing stick |
| botheration | (noun) something or someone that causes trouble; a source of unhappiness | Synonyms: annoyance, bother, infliction, nuisance, pain, pain in the ass, pain in the neck |
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| (noun) the psychological state of being irritated or annoyed | Synonyms: annoyance, irritation, vexation |
| brokerage | (noun) place where a broker conducts his business | Synonyms: brokerage house |
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| (noun) a stock broker's business; charges a fee to act as intermediary between buyer and seller | Synonyms: brokerage firm, securities firm |
| (noun) the business of a broker; charges a fee to arrange a contract between two parties | - |
| caldera | (noun) a large crater caused by the violent explosion of a volcano that collapses into a depression | - |
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| camera | (noun) equipment for taking photographs (usually consisting of a lightproof box with a lens at one end and light-sensitive film at the other) | Synonyms: photographic camera |
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| (noun) television equipment consisting of a lens system that focuses an image on a photosensitive mosaic that is scanned by an electron beam | Synonyms: television camera, tv camera |
| cameraman | (noun) a photographer who operates a movie camera | Synonyms: camera operator, cinematographer |
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| caravanserai | (noun) an inn in some eastern countries with a large courtyard that provides accommodation for caravans | Synonyms: caravan inn, caravansary, khan |
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| cauterant | (noun) an instrument or substance used to destroy tissue for medical reasons (e.g., removal of a wart) by burning it with a hot iron or an electric current or a caustic or by freezing it | Synonyms: cautery |
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| cefoperazone | (noun) a parenteral cephalosporin (trade name Cefobid) used for severe infections | Synonyms: Cefobid |
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| ceramic | (noun) an artifact made of hard brittle material produced from nonmetallic minerals by firing at high temperatures | - |
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| ceramicist | (noun) a craftsman who shapes pottery on a potter's wheel and bakes them in a kiln | Synonyms: ceramist, potter, thrower |
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| ceramics | (noun) the art of making and decorating pottery | - |
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| ceramist | (noun) a craftsman who shapes pottery on a potter's wheel and bakes them in a kiln | Synonyms: ceramicist, potter, thrower |
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| ceras | (noun) one of the often brightly colored and branching hornlike structures on the back of the nudibranch (and other related mollusks) that serve as gills | - |
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| cerastes | (noun) highly venomous viper of northern Africa and southwestern Asia having a horny spine above each eye | Synonyms: Cerastes cornutus, horned asp, horned viper, sand viper |
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| cerate | (noun) a hard medicated paste made of lard or oil mixed with wax or resin | - |
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| ceratin | (noun) a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves | Synonyms: keratin |
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| ceratodus | (noun) extinct lungfish | - |
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| ceratopsian | (noun) any of several four-footed herbivorous dinosaurs with enormous beaked skulls; of the late Cretaceous in North America and Mongolia | Synonyms: horned dinosaur |
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| ceratosaur | (noun) primitive medium-sized theropod; swift-running bipedal carnivorous dinosaur having grasping hands with sharp claws and a short horn between the nostrils; Jurassic in North America | Synonyms: ceratosaurus |
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| ceratosaurus | (noun) primitive medium-sized theropod; swift-running bipedal carnivorous dinosaur having grasping hands with sharp claws and a short horn between the nostrils; Jurassic in North America | Synonyms: ceratosaur |
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| ceratozamia | (noun) a small cycad of the genus Ceratozamia having a short scaly woody trunk and fernlike foliage and woody cones; Mexico | - |
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| chelicera | (noun) either of the first pair of fang-like appendages near the mouth of an arachnid; often modified for grasping and piercing | - |
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| chemotherapy | (noun) the use of chemical agents to treat or control disease (or mental illness) | - |
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| chimaera | (noun) a deep-sea fish with a tapering body, smooth skin, and long threadlike tail | - |
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| (noun) a grotesque product of the imagination | Synonyms: chimera |
| chimera | (noun) a grotesque product of the imagination | Synonyms: chimaera |
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| chiropteran | (noun) nocturnal mouselike mammal with forelimbs modified to form membranous wings and anatomical adaptations for echolocation by which they navigate | Synonyms: bat |
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| cholera | (noun) an acute intestinal infection caused by ingestion of contaminated water or food | Synonyms: Asiatic cholera, epidemic cholera, Indian cholera |
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| cholinesterase | (noun) an enzyme that hydrolyses acetylcholine (into choline and acetic acid) | - |
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| chrysotherapy | (noun) the use of chemicals containing gold for treating diseases (such as rheumatoid arthritis) | - |
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| cineraria | (noun) herb of Canary Islands widely cultivated for its blue or purple or red or variegated daisylike flowers | Synonyms: Pericallis cruenta, Senecio cruentus |
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| cinerarium | (noun) a niche for a funeral urn containing the ashes of the cremated dead | Synonyms: columbarium |
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| coelenterate | (noun) radially symmetrical animals having saclike bodies with only one opening and tentacles with stinging structures; they occur in polyp and medusa forms | Synonyms: cnidarian |
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| collateral | (noun) a security pledged for the repayment of a loan | - |
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| commiseration | (noun) an expression of sympathy with another's grief | Synonyms: condolence |
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| (noun) a feeling of sympathy and sorrow for the misfortunes of others | Synonyms: pathos, pity, ruth |
| confederacy | (noun) a secret agreement between two or more people to perform an unlawful act | Synonyms: conspiracy |
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| (noun) a union of political organizations | Synonyms: confederation, federation |
| (noun) a group of conspirators banded together to achieve some harmful or illegal purpose | Synonyms: conspiracy |
| confederate | (noun) a person who joins with another in carrying out some plan (especially an unethical or illegal plan) | Synonyms: accomplice |
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| (noun) someone who assists in a plot | Synonyms: collaborator, henchman, partner in crime |
| confederation | (noun) the act of forming an alliance or confederation | Synonyms: alliance |
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| (noun) a union of political organizations | Synonyms: confederacy, federation |
| (noun) the state of being allied or confederated | Synonyms: alliance |
| conglomerate | (noun) a group of diverse companies under common ownership and run as a single organization | Synonyms: empire |
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| (noun) a composite rock made up of particles of varying size | Synonyms: pudding stone |
| conglomeration | (noun) an occurrence combining miscellaneous things into a (more or less) rounded mass | Synonyms: conglobation |
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| (noun) a sum total of many heterogenous things taken together | Synonyms: aggregate, congeries |
| (noun) a rounded spherical form | Synonyms: conglobation |
| considerateness | (noun) kind and considerate regard for others | Synonyms: consideration, thoughtfulness |
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| consideration | (noun) a considerate and thoughtful act | Synonyms: thoughtfulness |
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| (noun) kind and considerate regard for others | Synonyms: considerateness, thoughtfulness |
| (noun) the process of giving careful thought to something | - |
| (noun) information that should be kept in mind when making a decision | Synonyms: circumstance, condition |
| (noun) a discussion of a topic (as in a meeting) | - |
| (noun) a fee charged in advance to retain the services of someone | Synonyms: retainer |
| cooperation | (noun) joint operation or action | - |
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| (noun) the practice of cooperating | - |
| cooperative | (noun) a jointly owned commercial enterprise (usually organized by farmers or consumers) that produces and distributes goods and services and is run for the benefit of its owners | Synonyms: co-op |
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| (noun) an association formed and operated for the benefit of those using it | - |
| cooperativeness | (noun) the trait of being cooperative | Synonyms: amenability, amenableness |
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| cooperator | (noun) an associate in an activity or endeavor or sphere of common interest | Synonyms: collaborator, pardner, partner |
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| counteraction | (noun) action intended to nullify the effects of some previous action | Synonyms: neutralisation, neutralization |
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| counterargument | (noun) an argument offered in opposition to another argument | - |
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| counterattack | (noun) an attack by a defending force against an attacking enemy force in order to regain lost ground or cut off enemy advance units etc. | Synonyms: countermove |
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| (noun) (chess) an attack that is intended to counter the opponent's advantage in another part of the board | Synonyms: counterplay |
| counterattraction | (noun) a rival attraction | - |
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| coverage | (noun) the extent to which something is covered | - |
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| (noun) the news as presented by reporters for newspapers or radio or television | Synonyms: reportage, reporting |
| (noun) the total amount and type of insurance carried | Synonyms: insurance coverage |
| coverall | (noun) a loose-fitting protective garment that is worn over other clothing | - |
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| culteranismo | (noun) an esoteric style of writing that attempted to elevate poetic language and themes by re-Latinizing them, using classical allusions, vocabulary, syntax, and word order. | Synonyms: Gongorismo |
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| curandera | (noun) a Mexican woman who practices healing techniques inherited from the Mayans | - |
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| cyberart | (noun) art that is produced with the help of computer hardware and software | - |
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| deceleration | (noun) the act of decelerating; decreasing the speed | - |
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| (noun) a decrease in rate of change | Synonyms: retardation, slowing |
| (noun) (physics) a rate of decrease in velocity | - |
| degeneracy | (noun) moral perversion; impairment of virtue and moral principles | Synonyms: corruption, depravation, depravity, putrefaction |
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| (noun) the state of being degenerate in mental or moral qualities | Synonyms: decadence, decadency, degeneration |
| degenerate | (noun) a person whose behavior deviates from what is acceptable especially in sexual behavior | Synonyms: deviant, deviate, perv, perve, pervert |
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| degeneration | (noun) passing from a more complex to a simpler biological form | Synonyms: retrogression |
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| (noun) the process of declining from a higher to a lower level of effective power or vitality or essential quality | Synonyms: devolution |
| (noun) the state of being degenerate in mental or moral qualities | Synonyms: decadence, decadency, degeneracy |
| deliberateness | (noun) the trait of thoughtfulness in action or decision | Synonyms: deliberation |
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| (noun) a rate demonstrating an absence of haste or hurry | Synonyms: deliberation, slowness, unhurriedness |
| deliberation | (noun) the trait of thoughtfulness in action or decision | Synonyms: deliberateness |
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| (noun) a rate demonstrating an absence of haste or hurry | Synonyms: deliberateness, slowness, unhurriedness |
| (noun) planning something carefully and intentionally | Synonyms: calculation |
| (noun) careful consideration | Synonyms: advisement, weighing |
| (noun) (usually plural) discussion of all sides of a question | - |
| deliverable | (noun) something that can be provided as the product of development | - |
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| deliverance | (noun) recovery or preservation from loss or danger | Synonyms: delivery, rescue, saving |
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| demerara | (noun) light brown cane sugar; originally from Guyana | Synonyms: demerara sugar |
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| (noun) dark rum from Guyana | Synonyms: demerara rum |
| (noun) a light brown raw cane sugar from Guyana | - |