| associationism | (noun) (psychology) a theory that association is the basic principle of mental activity | Synonyms: association theory |
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| assumption | (noun) the act of taking possession of or power over something | Synonyms: laying claim |
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| (noun) the act of assuming or taking for granted | - |
| (noun) audacious (even arrogant) behavior that you have no right to | Synonyms: effrontery, presumption, presumptuousness |
| (noun) a hypothesis that is taken for granted | Synonyms: supposal, supposition |
| (noun) a statement that is assumed to be true and from which a conclusion can be drawn | Synonyms: premise, premiss |
| asterion | (noun) the craniometric point at the junction of the lamboid suture and the occipitomastoid suture and the parietomastoid suture | - |
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| astronavigation | (noun) navigating according to the positions of the stars | Synonyms: celestial navigation |
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| atomisation | (noun) separating something into fine particles | Synonyms: atomization, fragmentation |
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| (noun) annihilation by reducing something to atoms | Synonyms: atomization |
| atomization | (noun) separating something into fine particles | Synonyms: atomisation, fragmentation |
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| (noun) annihilation by reducing something to atoms | Synonyms: atomisation |
| attention | (noun) the work of providing treatment for or attending to someone or something | Synonyms: aid, care, tending |
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| (noun) a courteous act indicating affection | - |
| (noun) a motionless erect stance with arms at the sides and feet together; assumed by military personnel during drill or review | - |
| (noun) the process whereby a person concentrates on some features of the environment to the (relative) exclusion of others | Synonyms: attending |
| (noun) the faculty or power of mental concentration | - |
| (noun) a general interest that leads people to want to know more | - |
| attentional | (adjective) of or relating to attention | - |
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| attenuation | (noun) the property of something that has been weakened or reduced in thickness or density | - |
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| (noun) weakening in force or intensity | Synonyms: fading |
| attestation | (noun) the action of bearing witness | - |
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| (noun) the evidence by which something is attested | - |
| attraction | (noun) the quality of arousing interest; being attractive or something that attracts | Synonyms: attractiveness |
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| (noun) a characteristic that provides pleasure and attracts | Synonyms: attracter, attractive feature, attractor, magnet |
| (noun) an entertainment that is offered to the public | - |
| (noun) an entertainer who attracts large audiences | Synonyms: attracter, attractor, draw, drawing card |
| (noun) the force by which one object attracts another | Synonyms: attractive force |
| attribution | (noun) assigning to a cause or source | Synonyms: ascription |
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| (noun) assigning some quality or character to a person or thing | Synonyms: ascription |
| attrition | (noun) the act of rubbing together; wearing something down by friction | - |
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| (noun) a wearing down to weaken or destroy | - |
| (noun) sorrow for sin arising from fear of damnation | Synonyms: contriteness, contrition |
| (noun) the wearing down of rock particles by friction due to water or wind or ice | Synonyms: abrasion, detrition, grinding |
| (noun) erosion by friction | Synonyms: abrasion, corrasion, detrition |
| attritional | (adjective) relating to or caused by attrition | - |
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| auction | (noun) the public sale of something to the highest bidder | Synonyms: auction sale, vendue |
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| (noun) a variety of bridge in which tricks made in excess of the contract are scored toward game; now generally superseded by contract bridge | Synonyms: auction bridge |
| (verb) sell at an auction | Synonyms: auction off, auctioneer |
| auctioneer | (noun) an agent who conducts an auction | - |
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| (verb) sell at an auction | Synonyms: auction, auction off |
| audition | (noun) a test of the suitability of a performer | Synonyms: tryout |
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| (noun) the ability to hear; the auditory faculty | Synonyms: auditory modality, auditory sense, hearing, sense of hearing |
| (verb) perform in order to get a role | Synonyms: try out |
| augmentation | (noun) the act of augmenting | - |
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| (noun) the statement of a theme in notes of greater duration (usually twice the length of the original) | - |
| (noun) the amount by which something becomes greater | - |
| auscultation | (noun) listening to sounds within the body (usually with a stethoscope) | - |
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| authentication | (noun) validating the authenticity of something or someone | Synonyms: certification |
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| (noun) a mark on an article of trade to indicate its origin and authenticity | Synonyms: assay-mark, hallmark |
| authorisation | (noun) the act of conferring legality or sanction or formal warrant | Synonyms: authorization, empowerment |
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| (noun) the power or right to give orders or make decisions | Synonyms: authority, authorization, dominance, potency, say-so |
| (noun) official permission or approval | Synonyms: authority, authorization, sanction |
| (noun) a document giving an official instruction or command | Synonyms: authorization, mandate |
| authorization | (noun) the act of conferring legality or sanction or formal warrant | Synonyms: authorisation, empowerment |
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| (noun) the power or right to give orders or make decisions | Synonyms: authorisation, authority, dominance, potency, say-so |
| (noun) official permission or approval | Synonyms: authorisation, authority, sanction |
| (noun) a document giving an official instruction or command | Synonyms: authorisation, mandate |
| automation | (noun) the act of implementing the control of equipment with advanced technology; usually involving electronic hardware | Synonyms: mechanisation, mechanization |
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| (noun) equipment used to achieve automatic control or operation | - |
| (noun) the condition of being automatically operated or controlled | - |
| autoregulation | (noun) (physiology) processes that maintain a generally constant physiological state in a cell or organism | - |
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| autosuggestion | (noun) a system for self-improvement developed by Emile Coue which was popular in the 1920s and 1930s | Synonyms: auto-suggestion, self-suggestion |
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| aversion | (noun) the act of turning yourself (or your gaze) away | Synonyms: averting |
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| (noun) a feeling of intense dislike | Synonyms: antipathy, distaste |
| aviation | (noun) travel via aircraft | Synonyms: air, air travel |
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| (noun) the art of operating aircraft | Synonyms: airmanship |
| (noun) the aggregation of a country's military aircraft | Synonyms: air power |
| (noun) the operation of aircraft to provide transportation | - |
| avionic | (adjective) of or relating to avionics | - |
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| avionics | (noun) science and technology of electronic systems and devices for aeronautics and astronautics | - |
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| avocation | (noun) an auxiliary activity | Synonyms: by-line, hobby, pursuit, sideline, spare-time activity |
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| avocational | (adjective) of or involved in an avocation | - |
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| avulsion | (noun) a forcible tearing or surgical separation of one body part from another | - |
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| (noun) an abrupt change in the course of a stream that forms the boundary between two parcels of land resulting in the loss of part of the land of one landowner and a consequent increase in the land of another | - |
| backwardation | (noun) the market condition wherein the price of a forward or futures contract is trading below the expected spot price at contract maturity. | - |
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| barbarisation | (noun) an act that makes people primitive and uncivilized | Synonyms: barbarization |
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| barbarization | (noun) an act that makes people primitive and uncivilized | Synonyms: barbarisation |
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| bastardisation | (noun) an act that debases or corrupts | Synonyms: bastardization |
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| bastardization | (noun) an act that debases or corrupts | Synonyms: bastardisation |
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| (noun) declaring or rendering bastard | - |
| bastion | (noun) projecting part of a rampart or other fortification | - |
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| (noun) a stronghold into which people could go for shelter during a battle | Synonyms: citadel |
| (noun) a group that defends a principle | - |
| bastioned | (adjective) secured with bastions or fortifications | Synonyms: fortified |
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| battalion | (noun) an army unit usually consisting of a headquarters and three or more companies | - |
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| (noun) a large indefinite quantity | Synonyms: large number, multitude, pack, plurality |
| bazillion | (noun) a very large indefinite number (usually hyperbole) | Synonyms: billion, gazillion, jillion, million, trillion, zillion |
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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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| benediction | (noun) the act of praying for divine protection | Synonyms: blessing |
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| (noun) a ceremonial prayer invoking divine protection | Synonyms: blessing |
| benefaction | (noun) an act intending or showing kindness and good will | Synonyms: benevolence |
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| (noun) a contribution of money or assistance | - |
| 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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| bidirectional | (adjective) reactive or functioning or allowing movement in two usually opposite directions | - |
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| bifurcation | (noun) the act of splitting into two branches | - |
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| (noun) the place where something divides into two branches | - |
| (noun) a bifurcating branch (one or both of them) | - |
| billion | (adjective) denoting a quantity consisting of one thousand million items or units in the United States | - |
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| (adjective) denoting a quantity consisting of one million million items or units in Great Britain | - |
| (noun) the number that is represented as a one followed by 9 zeros | Synonyms: 1000000000, one thousand million |
| (noun) the number that is represented as a one followed by 12 zeros; in the United Kingdom the usage followed in the United States is frequently seen | Synonyms: 1000000000000, one million million |
| (noun) a very large indefinite number (usually hyperbole) | Synonyms: bazillion, gazillion, jillion, million, trillion, zillion |
| billionaire | (noun) a very rich person whose material wealth is valued at more than a billion dollars | - |
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| billionth | (adjective) the ordinal number of one billion in counting order | - |
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| (noun) one part in a billion equal parts | Synonyms: one-billionth |
| (noun) position 1,000,000,000 in a countable series of things | - |
| bilocation | (noun) the ability (said of certain Roman Catholic saints) to exist simultaneously in two locations | - |
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| bionic | (adjective) of or relating to bionics | - |
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| (adjective) having particular physiological functions augmented or replaced by electronic or electromechanical components | - |
| bionics | (noun) application of biological principles to the study and design of engineering systems (especially electronic systems) | - |
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| bionomic | (adjective) of or relating to the science of ecology | Synonyms: bionomical, ecologic, ecological |
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| bionomical | (adjective) of or relating to the science of ecology | Synonyms: bionomic, ecologic, ecological |
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| bionomics | (noun) the branch of biology concerned with the relations between organisms and their environment | Synonyms: ecology, environmental science |
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| biont | (noun) a discrete unit of living matter | - |
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| bioremediation | (noun) the act of treating waste or pollutants by the use of microorganisms (as bacteria) that can break down the undesirable substances | - |
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| (noun) the branch of biotechnology that uses biological process to overcome environmental problems | - |
| bisection | (noun) dividing into two equal parts | - |
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| bisectional | (adjective) of or relating to bisection | - |
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| blaxploitation | (noun) the exploitation of black people (especially with regard to stereotyped roles in movies) | - |
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| bombilation | (noun) sound of rapid vibration | Synonyms: bombination, buzz |
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| bombination | (noun) sound of rapid vibration | Synonyms: bombilation, buzz |
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| 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 |
| bowdlerisation | (noun) the act of deleting or modifying all passages considered to be indecent | Synonyms: bowdlerization |
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| (noun) written material that has been bowdlerized | Synonyms: bowdlerization |
| bowdlerization | (noun) the act of deleting or modifying all passages considered to be indecent | Synonyms: bowdlerisation |
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| (noun) written material that has been bowdlerized | Synonyms: bowdlerisation |
| brachiation | (noun) swinging by the arms from branch to branch | - |
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| briony | (noun) a vine of the genus Bryonia having large leaves and small flowers and yielding acrid juice with emetic and purgative properties | Synonyms: bryony |
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| brutalisation | (noun) an act that makes people cruel or lacking normal human qualities | Synonyms: animalisation, animalization, brutalization |
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| (noun) the activity of treating someone savagely or viciously | Synonyms: brutalization |
| (noun) the condition of being treated in a cruel and savage manner | Synonyms: brutalization |
| brutalization | (noun) an act that makes people cruel or lacking normal human qualities | Synonyms: animalisation, animalization, brutalisation |
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| (noun) the activity of treating someone savagely or viciously | Synonyms: brutalisation |
| (noun) the condition of being treated in a cruel and savage manner | Synonyms: brutalisation |
| bullion | (noun) gold or silver in bars or ingots | - |
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| (noun) a mass of precious metal | - |
| bunion | (noun) a painful swelling of the bursa of the first joint of the big toe | - |
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| cachinnation | (noun) loud convulsive laughter | - |
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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 | - |
| calcination | (noun) the conversion of metals into their oxides as a result of heating to a high temperature | - |
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| calculation | (noun) the procedure of calculating; determining something by mathematical or logical methods | Synonyms: computation, computing |
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| (noun) problem solving that involves numbers or quantities | Synonyms: computation, figuring, reckoning |
| (noun) planning something carefully and intentionally | Synonyms: deliberation |
| calefaction | (noun) the property of being warming | Synonyms: incalescence |
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| calibration | (noun) the act of checking or adjusting (by comparison with a standard) the accuracy of a measuring instrument | Synonyms: standardisation, standardization |
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| calumniation | (noun) a false accusation of an offense or a malicious misrepresentation of someone's words or actions | Synonyms: calumny, defamation, hatchet job, obloquy, traducement |
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| camion | (noun) a low heavy horse cart without sides; used for haulage | Synonyms: dray |
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| (noun) a large truck designed to carry heavy loads; usually without sides | Synonyms: lorry |
| campion | (noun) any plant of the genus Silene | Synonyms: catchfly, silene |
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| canalisation | (noun) the production of a canal or a conversion to canals | Synonyms: canalization |
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| (noun) management through specified channels of communication | Synonyms: canalization, channelisation, channelization |
| canalization | (noun) the production of a canal or a conversion to canals | Synonyms: canalisation |
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| (noun) management through specified channels of communication | Synonyms: canalisation, channelisation, channelization |
| cancellation | (noun) the act of cancelling; calling off some arrangement | - |
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| (noun) the speech act of revoking or annulling or making void | - |
| cannulation | (noun) the insertion of a cannula or tube into a hollow body organ | Synonyms: cannulisation, cannulization, canulation, canulisation, canulization, intubation |
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| cannulisation | (noun) the insertion of a cannula or tube into a hollow body organ | Synonyms: cannulation, cannulization, canulation, canulisation, canulization, intubation |
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| cannulization | (noun) the insertion of a cannula or tube into a hollow body organ | Synonyms: cannulation, cannulisation, canulation, canulisation, canulization, intubation |
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| canonisation | (noun) (Roman Catholic and Eastern Orthodox Church) the act of admitting a deceased person into the canon of saints | Synonyms: canonization |
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| canonization | (noun) (Roman Catholic and Eastern Orthodox Church) the act of admitting a deceased person into the canon of saints | Synonyms: canonisation |
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| cantillation | (noun) liturgical chanting | - |
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| canulation | (noun) the insertion of a cannula or tube into a hollow body organ | Synonyms: cannulation, cannulisation, cannulization, canulisation, canulization, intubation |
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| canulisation | (noun) the insertion of a cannula or tube into a hollow body organ | Synonyms: cannulation, cannulisation, cannulization, canulation, canulization, intubation |
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| canulization | (noun) the insertion of a cannula or tube into a hollow body organ | Synonyms: cannulation, cannulisation, cannulization, canulation, canulisation, intubation |
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| capitalisation | (noun) the act of capitalizing on an opportunity | Synonyms: capitalization |
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| (noun) the sale of capital stock | Synonyms: capitalization |
| (noun) an estimation of the value of a business | Synonyms: capitalization |
| (noun) writing in capital letters | Synonyms: capitalization |
| capitalization | (noun) the act of capitalizing on an opportunity | Synonyms: capitalisation |
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| (noun) the sale of capital stock | Synonyms: capitalisation |
| (noun) an estimation of the value of a business | Synonyms: capitalisation |
| (noun) writing in capital letters | Synonyms: capitalisation |
| capitation | (noun) a tax levied on the basis of a fixed amount per person | - |
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| capitulation | (noun) the act of surrendering (usually under agreed conditions) | Synonyms: fall, surrender |
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| (noun) a summary that enumerates the main parts of a topic | - |
| (noun) a document containing the terms of surrender | - |
| caption | (noun) brief description accompanying an illustration | Synonyms: legend |
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| (noun) translation of foreign dialogue of a movie or TV program; usually displayed at the bottom of the screen | Synonyms: subtitle |
| (noun) taking exception; especially a quibble based on a captious argument | - |
| (verb) provide with a caption, as of a photograph or a drawing | - |
| captivation | (noun) a feeling of great liking for something wonderful and unusual | Synonyms: enchantment, enthrallment, fascination |
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| (noun) the state of being intensely interested (as by awe or terror) | Synonyms: fascination |