| combatant | (noun) someone who fights (or is fighting) | Synonyms: battler, belligerent, fighter, scrapper |
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| comfortableness | (noun) a feeling of being at ease in a relationship | - |
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| (noun) a state of being relaxed and feeling no pain | Synonyms: comfort |
| commentary | (noun) a written explanation or criticism or illustration that is added to a book or other textual material | Synonyms: comment |
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| commentator | (noun) a writer who reports and analyzes events of the day | Synonyms: reviewer |
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| (noun) an expert who observes and comments on something | Synonyms: observer |
| committal | (noun) the official act of consigning a person to confinement (as in a prison or mental hospital) | Synonyms: commitment, consignment |
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| (noun) the act of committing a crime | Synonyms: commission, perpetration |
| commutability | (noun) the quality of being commutable | Synonyms: transmutability |
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| (noun) exchangeability by virtue of being replaceable | Synonyms: replaceability, substitutability |
| commutation | (noun) the travel of a commuter | Synonyms: commuting |
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| (noun) (law) the reduction in severity of a punishment imposed by law | Synonyms: re-sentencing |
| (noun) the act of putting one thing or person in the place of another: | Synonyms: exchange, substitution |
| (noun) a warrant substituting a lesser punishment for a greater one | - |
| commutator | (noun) switch for reversing the direction of an electric current | - |
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| compartmentalisation | (noun) the act of distributing things into classes or categories of the same type | Synonyms: assortment, categorisation, categorization, classification, compartmentalization |
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| (noun) a mild state of dissociation | Synonyms: compartmentalization |
| compartmentalization | (noun) the act of distributing things into classes or categories of the same type | Synonyms: assortment, categorisation, categorization, classification, compartmentalisation |
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| (noun) a mild state of dissociation | Synonyms: compartmentalisation |
| complementarity | (noun) a relation between two opposite states or principles that together exhaust the possibilities | - |
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| (noun) the interrelation of reciprocity whereby one thing supplements or depends on the other | - |
| complementary | (noun) either one of two chromatic colors that when mixed together give white (in the case of lights) or grey (in the case of pigments) | Synonyms: complementary color |
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| complementation | (noun) (linguistics) a distribution of related speech sounds or forms in such a way that they only appear in different contexts | Synonyms: complementary distribution |
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| (noun) the grammatical relation of a word or phrase to a predicate | - |
| complimentariness | (noun) The state or quality of being in the nature of an expression of praise, congratulation, encouragement, or respect. | - |
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| computation | (noun) the procedure of calculating; determining something by mathematical or logical methods | Synonyms: calculation, computing |
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| (noun) problem solving that involves numbers or quantities | Synonyms: calculation, figuring, reckoning |
| concomitance | (noun) occurrence or existence together or in connection with one another | - |
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| concomitant | (noun) an event or situation that happens at the same time as or in connection with another | Synonyms: accompaniment, attendant, co-occurrence |
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| conductance | (noun) a material's capacity to conduct electricity; measured as the reciprocal of electrical resistance | - |
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| confrontation | (noun) the act of hostile groups opposing each other | Synonyms: opposition |
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| (noun) a focussed comparison; bringing together for a careful comparison | - |
| (noun) a hostile disagreement face-to-face | Synonyms: encounter, face-off, showdown |
| (noun) a bold challenge | - |
| (noun) discord resulting from a clash of ideas or opinions | - |
| confutation | (noun) evidence that refutes conclusively | - |
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| (noun) the speech act of refuting conclusively | - |
| connotation | (noun) an idea that is implied or suggested | - |
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| (noun) what you must know in order to determine the reference of an expression | Synonyms: intension |
| conquistador | (noun) an adventurer (especially one who led the Spanish conquest of Mexico and Peru in the 16th century) | - |
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| constable | (noun) a lawman with less authority and jurisdiction than a sheriff | - |
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| (noun) a police officer of the lowest rank | Synonyms: police constable |
| constabulary | (noun) the force of policemen and officers | Synonyms: law, police, police force |
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| constancy | (noun) the quality of being enduring and free from change or variation | Synonyms: stability |
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| (noun) faithfulness and dependability in personal attachments (especially sexual fidelity) | - |
| (noun) (psychology) the tendency for perceived objects to give rise to very similar perceptual experiences in spite of wide variations in the conditions of observation | Synonyms: perceptual constancy |
| constant | (noun) a quantity that does not vary | Synonyms: constant quantity, invariable |
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| (noun) a number representing a quantity assumed to have a fixed value in a specified mathematical context | - |
| constantan | (noun) an alloy of copper and nickel with high electrical resistance and a low temperature coefficient; used as resistance wire | Synonyms: Eureka |
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| constatation | (noun) an assumption that is basic to an argument | Synonyms: basic assumption, self-evident truth |
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| consubstantiation | (noun) the doctrine of the High Anglican Church that after the consecration of the Eucharist the substance of the body and blood of Christ coexists with the substance of the consecrated bread and wine | - |
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| consultancy | (noun) the practice of giving expert advice within a particular field | - |
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| consultant | (noun) an expert who gives advice | Synonyms: adviser, advisor |
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| consultation | (noun) the act of referring or consulting | Synonyms: reference |
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| (noun) a conference (usually with someone important) | Synonyms: audience, interview |
| (noun) a conference between two or more people to consider a particular question | - |
| contact | (noun) the act of touching physically | Synonyms: physical contact |
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| (noun) close interaction | - |
| (noun) (electronics) a junction where things (as two electrical conductors) touch or are in physical contact | Synonyms: tangency |
| (noun) a thin curved glass or plastic lens designed to fit over the cornea in order to correct vision or to deliver medication | Synonyms: contact lens |
| (noun) a channel for communication between groups | Synonyms: inter-group communication, liaison, link |
| (noun) a communicative interaction | Synonyms: touch |
| (noun) the physical coming together of two or more things | Synonyms: impinging, striking |
| (noun) a person who is in a position to give you special assistance | Synonyms: middleman |
| (noun) the state or condition of touching or of being in immediate proximity | - |
| contadino | (noun) an Italian farmer | - |
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| contagion | (noun) the communication of an attitude or emotional state among a number of people | Synonyms: infection |
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| (noun) an incident in which an infectious disease is transmitted | Synonyms: infection, transmission |
| (noun) any disease easily transmitted by contact | Synonyms: contagious disease |
| contagiousness | (noun) The state or condition of being contagious, easily transmitted to others. | - |
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| container | (noun) any object that can be used to hold things (especially a large metal boxlike object of standardized dimensions that can be loaded from one form of transport to another) | - |
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| containerful | (noun) the quantity that a container will hold | - |
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| containership | (noun) a cargo ship designed to hold containerized cargoes | Synonyms: container ship, container vessel |
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| containment | (noun) the act of containing; keeping something from spreading | - |
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| (noun) (physics) a system designed to prevent the accidental release of radioactive material from a reactor | - |
| (noun) a policy of creating strategic alliances in order to check the expansion of a hostile power or ideology or to force it to negotiate peacefully | - |
| contaminant | (noun) a substance that contaminates | Synonyms: contamination |
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| contamination | (noun) the act of contaminating or polluting; including (either intentionally or accidentally) unwanted substances or factors | Synonyms: pollution |
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| (noun) the state of being contaminated | Synonyms: taint |
| (noun) a substance that contaminates | Synonyms: contaminant |
| contestant | (noun) a person who participates in competitions | - |
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| (noun) a person who dissents from some established policy | Synonyms: dissenter, dissident, objector, protester |
| contestation | (noun) a contentious speech act; a dispute where there is strong disagreement | Synonyms: arguing, argument, contention, controversy, disceptation, disputation, tilt |
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| convertase | (noun) any of several enzymes that convert a compound into smaller, biologically-active compounds. | - |
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| cornstalk | (noun) the stalk of a corn plant | Synonyms: corn stalk |
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| cornstarch | (noun) starch prepared from the grains of corn; used in cooking as a thickener | Synonyms: cornflour |
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| cosmopolitan | (noun) a sophisticated person who has travelled in many countries | Synonyms: cosmopolite |
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| cosmopolitanity | (noun) a state or quality of being cosmopolitan | - |
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| costa | (noun) any of the 12 pairs of curved arches of bone extending from the spine to or toward the sternum in humans (and similar bones in most vertebrates) | Synonyms: rib |
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| (noun) a riblike part of a plant or animal (such as a middle rib of a leaf or a thickened vein of an insect wing) | - |
| costalgia | (noun) pain in the chest caused by inflammation of the muscles between the ribs | Synonyms: pleuralgia, pleurodynia |
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| cotan | (noun) ratio of the adjacent to the opposite side of a right-angled triangle | Synonyms: cotangent |
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| cotangent | (noun) ratio of the adjacent to the opposite side of a right-angled triangle | Synonyms: cotan |
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| cottage | (noun) a small house with a single story | Synonyms: bungalow |
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| cottager | (noun) someone who lives in a cottage | Synonyms: cottage dweller |
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| cottar | (noun) fastener consisting of a wedge or pin inserted through a slot to hold two other pieces together | Synonyms: cotter |
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| (noun) a peasant farmer in the Scottish Highlands | Synonyms: cotter |
| cottontail | (noun) common small rabbit of North America having greyish or brownish fur and a tail with a white underside; a host for Ixodes pacificus and Ixodes scapularis (Lyme disease ticks) | Synonyms: cottontail rabbit, wood rabbit |
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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 |
| counterirritant | (noun) a medicine applied locally to produce superficial inflammation in order to reduce deeper inflammation | - |
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| counterstain | (noun) a stain of contrasting color that is used when the principal stain does not show the structure clearly | - |
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| crepitation | (noun) the sharp sound of snapping noises | Synonyms: crackle, crackling |
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| cristal | (noun) street names for methylenedioxymethamphetamine | Synonyms: Adam, disco biscuit, ecstasy, go, hug drug, X, XTC |
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| crosstalk | (noun) the presence of an unwanted signal via an accidental coupling | Synonyms: XT |
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| crotal | (noun) any of several lichens of the genus Parmelia from which reddish brown or purple dyes are made | Synonyms: crottal, crottle |
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| crotalaria | (noun) any of various plants of the genus Crotalaria having inflated pods within which the seeds rattle; used for pasture and green-manure crops | Synonyms: rattlebox |
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| crotaphion | (noun) the tip of the greater wing of the sphenoid bone | - |
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| crottal | (noun) any of several lichens of the genus Parmelia from which reddish brown or purple dyes are made | Synonyms: crotal, crottle |
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| crustacean | (noun) any mainly aquatic arthropod usually having a segmented body and chitinous exoskeleton | - |
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| cryostat | (noun) a thermostat that operates at very low temperatures | - |
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| cryptanalysis | (noun) the science of analyzing and deciphering codes and ciphers and cryptograms | Synonyms: cryptanalytics, cryptography, cryptology |
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| cryptanalyst | (noun) decoder skilled in the analysis of codes and cryptograms | Synonyms: cryptographer, cryptologist |
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| cryptanalytics | (noun) the science of analyzing and deciphering codes and ciphers and cryptograms | Synonyms: cryptanalysis, cryptography, cryptology |
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| crystal | (noun) a protective cover that protects the face of a watch | Synonyms: watch crystal, watch glass |
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| (noun) glassware made of quartz | - |
| (noun) a crystalline element used as a component in various electronic devices | - |
| (noun) a rock formed by the solidification of a substance; has regularly repeating internal structure; external plane faces | Synonyms: crystallization |
| (noun) a solid formed by the solidification of a chemical and having a highly regular atomic structure | - |
| (noun) colorless glass made of almost pure silica | Synonyms: lechatelierite, quartz, quartz glass, vitreous silica |
| crystallinity | (noun) (chemistry) The degree of structural order in a solid. | - |
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| crystallisation | (noun) the formation of crystals | Synonyms: crystallization, crystallizing |
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| crystallite | (noun) any of numerous minute rudimentary crystalline bodies of unknown composition found in glassy igneous rock | - |
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| crystallization | (noun) a mental synthesis that becomes fixed or concrete by a process resembling crystal formation | - |
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| (noun) a rock formed by the solidification of a substance; has regularly repeating internal structure; external plane faces | Synonyms: crystal |
| (noun) the formation of crystals | Synonyms: crystallisation, crystallizing |
| crystallizing | (noun) the formation of crystals | Synonyms: crystallisation, crystallization |
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| crystallogen | (noun) any chemical element that belongs to the carbon group. | Synonyms: carbon group element, Group 14 element, tetragen, tetrel |
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| crystallographer | (noun) a specialist in crystallography | - |
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| crystallography | (noun) the branch of science that studies the formation and structure of crystals | - |
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| cunctation | (noun) the act of procrastinating; putting off or delaying or deferring an action to a later time | Synonyms: procrastination, shillyshally |
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| cunctator | (noun) someone who postpones work (especially out of laziness or habitual carelessness) | Synonyms: postponer, procrastinator |
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| curettage | (noun) surgery to remove tissue or growths from a bodily cavity (as the uterus) by scraping with a curette | Synonyms: curettement |
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| curtailment | (noun) the act of withholding or withdrawing some book or writing from publication or circulation | Synonyms: suppression |
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| (noun) the reduction of expenditures in order to become financially stable | Synonyms: downsizing, retrenchment |
| (noun) the temporal property of being cut short | - |
| curtain | (noun) hanging cloth used as a blind (especially for a window) | Synonyms: drape, drapery, mantle, pall |
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| (noun) any barrier to communication or vision | - |
| custard | (noun) sweetened mixture of milk and eggs baked or boiled or frozen | - |
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| cutaway | (noun) a man's coat cut diagonally from the waist to the back of the knees | - |
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| (noun) a representation (drawing or model) of something in which the outside is omitted to reveal the inner parts | Synonyms: cutaway drawing, cutaway model |
| cyproheptadine | (noun) an antihistamine (trade name Periactin) used to treat some allergic reactions | Synonyms: Periactin |
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| darmstadtium | (noun) a radioactive transuranic element, with atomic number 110 | Synonyms: atomic number 110, Ds, element 110 |
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| dastard | (noun) a despicable coward | - |
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| dastardliness | (noun) despicable cowardice | - |
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| data | (noun) a collection of facts from which conclusions may be drawn | Synonyms: information |
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| database | (noun) an organized body of related information | - |
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| daystar | (noun) a planet (usually Venus) seen just before sunrise in the eastern sky | Synonyms: Lucifer, morning star, Phosphorus |
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| debilitation | (noun) serious weakening and loss of energy | Synonyms: enervation, enfeeblement, exhaustion |
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| debutante | (noun) a young woman making her debut into society | Synonyms: deb |
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| decantation | (noun) the act of gently pouring off a clear liquor (as from its original bottle) without disturbing the lees | - |
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| decapitation | (noun) killing by cutting off the head | Synonyms: beheading |
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| (noun) execution by cutting off the victim's head | Synonyms: beheading |
| decentalisation | (noun) the social process in which population and industry moves from urban centers to outlying districts | Synonyms: decentralization |
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