| colorimeter | (noun) a measuring instrument used in colorimetric analysis to determine the quantity of a substance from the color it yields with specific reagents | Synonyms: tintometer |
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| colter | (noun) a sharp steel wedge that precedes the plow and cuts vertically through the soil | Synonyms: coulter |
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| comforter | (noun) bedding made of two layers of cloth filled with stuffing and stitched together | Synonyms: comfort, puff, quilt |
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| (noun) device used for an infant to suck or bite on | Synonyms: baby's dummy, pacifier, teething ring |
| (noun) a person who commiserates with someone who has had misfortune | Synonyms: sympathiser, sympathizer |
| (noun) a person who reduces the intensity (e.g., of fears) and calms and pacifies | Synonyms: allayer, reliever |
| commuter | (noun) a passenger train that is ridden primarily by passengers who travel regularly from one place to another | Synonyms: commuter train |
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| (noun) someone who travels regularly from home in a suburb to work in a city | - |
| computer | (noun) a machine for performing calculations automatically | Synonyms: computing device, computing machine, data processor, electronic computer, information processing system |
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| (noun) an expert at calculation (or at operating calculating machines) | Synonyms: calculator, estimator, figurer, reckoner |
| computerise | (verb) control a function, process, or creation by a computer | Synonyms: computerize, cybernate |
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| (verb) store in a computer | Synonyms: computerize |
| (verb) provide with computers | Synonyms: computerize |
| computerization | (noun) the control of processes by computer | Synonyms: cybernation |
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| computerize | (verb) control a function, process, or creation by a computer | Synonyms: computerise, cybernate |
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| (verb) store in a computer | Synonyms: computerise |
| (verb) provide with computers | Synonyms: computerise |
| concenter | (verb) bring into focus or alignment; to converge or cause to converge; of ideas or emotions | Synonyms: concentre, focalise, focalize, focus |
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| confuter | (noun) a debater who refutes or disproves by offering contrary evidence or argument | Synonyms: disprover, rebutter, refuter |
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| connecter | (noun) an instrumentality that connects | Synonyms: connection, connective, connector, connexion |
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| consternate | (verb) fill with anxiety, dread, dismay, or confusion | - |
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| consternation | (noun) fear resulting from the awareness of danger | Synonyms: alarm, dismay |
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| conterminous | (adjective) being of equal extent or scope or duration | Synonyms: coextensive, coterminous |
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| (adjective) connecting without a break; within a common boundary | Synonyms: contiguous |
| (adjective) having a common boundary or edge; abutting; touching | Synonyms: adjacent, contiguous, neighboring, neighbouring |
| contester | (noun) someone who contests an outcome (of a race or an election etc.) | - |
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| contralateral | (adjective) on or relating to the opposite side (of the body) | - |
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| converter | (noun) a device for changing one substance or form or state into another | Synonyms: convertor |
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| cooter | (noun) large river turtle of the southern United States and northern Mexico | Synonyms: Pseudemys concinna, river cooter |
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| copywriter | (noun) a person employed to write advertising or publicity copy | - |
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| corticosteroid | (noun) a steroid hormone produced by the adrenal cortex or synthesized; administered as drugs they reduce swelling and decrease the body's immune response | Synonyms: adrenal cortical steroid, corticoid |
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| corticosterone | (noun) secreted by the adrenal cortex; involved in regulating water and electrolyte balance in the body | - |
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| corynebacterium | (noun) any species of the genus Corynebacterium | - |
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| costermonger | (noun) a hawker of fruit and vegetables from a barrow | Synonyms: barrow-boy, barrow-man |
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| coterie | (noun) an exclusive circle of people with a common purpose | Synonyms: camp, clique, ingroup, inner circle, pack |
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| coterminous | (adjective) being of equal extent or scope or duration | Synonyms: coextensive, conterminous |
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| coterminously | (adverb) in a coterminous manner | - |
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| cotoneaster | (noun) any shrub of the genus Cotoneaster: erect or creeping shrubs having richly colored autumn foliage and many small white to pinkish flowers followed by tiny red or black fruits | - |
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| cotter | (noun) fastener consisting of a wedge or pin inserted through a slot to hold two other pieces together | Synonyms: cottar |
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| (noun) a medieval English villein | Synonyms: cottier |
| (noun) a peasant farmer in the Scottish Highlands | Synonyms: cottar |
| coulter | (noun) a sharp steel wedge that precedes the plow and cuts vertically through the soil | Synonyms: colter |
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| counter | (adjective) indicating opposition or resistance | Synonyms: antagonistic |
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| (noun) a return punch (especially by a boxer) | Synonyms: counterpunch, parry |
| (noun) table consisting of a horizontal surface over which business is transacted | - |
| (noun) a calculator that keeps a record of the number of times something happens | Synonyms: tabulator |
| (noun) a piece of leather forming the back of a shoe or boot | Synonyms: heel counter |
| (noun) game equipment (as a piece of wood, plastic, or ivory) used for keeping a count or reserving a space in various card or board games | - |
| (noun) a piece of furniture that stands at the side of a dining room; has shelves and drawers | Synonyms: buffet, sideboard |
| (noun) (computer science) a register whose contents go through a regular series of states (usually states indicating consecutive integers) | - |
| (noun) a quick reply to a question or remark (especially a witty or critical one) | Synonyms: comeback, rejoinder, replication, retort, return, riposte |
| (noun) a person who counts things | - |
| (adverb) in the opposite direction | - |
| (verb) speak in response | - |
| (verb) act in advance of; deal with ahead of time | Synonyms: anticipate, foresee, forestall |
| counteract | (verb) act in opposition to | Synonyms: antagonise, antagonize |
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| (verb) destroy property or hinder normal operations | Synonyms: countermine, sabotage, subvert, undermine, weaken |
| (verb) oppose or check by a counteraction | Synonyms: countercheck |
| (verb) oppose and mitigate the effects of by contrary actions | Synonyms: counterbalance, countervail, neutralize |
| counteraction | (noun) action intended to nullify the effects of some previous action | Synonyms: neutralisation, neutralization |
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| counteractive | (adjective) opposing or neutralizing or mitigating an effect by contrary action | - |
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| counteractively | (adverb) in a counteractive manner | - |
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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 |
| (verb) make a counterattack | Synonyms: counterstrike |
| counterattraction | (noun) a rival attraction | - |
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| counterbalance | (noun) a weight that balances another weight | Synonyms: balance, counterpoise, counterweight, equaliser, equalizer |
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| (noun) a compensating equivalent | Synonyms: offset |
| (noun) equality of distribution | Synonyms: balance, equilibrium, equipoise |
| (verb) oppose and mitigate the effects of by contrary actions | Synonyms: counteract, countervail, neutralize |
| (verb) contrast with equal weight or force | Synonyms: oppose |
| (verb) adjust for | Synonyms: compensate, correct, even off, even out, even up, make up |
| counterbalanced | (adjective) brought into equipoise by means of a weight or force that offsets another | Synonyms: counterpoised |
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| counterblast | (noun) a vigorous and unrestrained response | - |
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| counterblow | (noun) a return blow; a retaliatory blow | - |
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| counterbombardment | (noun) bombardment intended to destroy or neutralize enemy weapons | - |
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| counterbore | (noun) a bit for enlarging the upper part of a hole | Synonyms: countersink, countersink bit |
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| counterchallenge | (verb) challenge in turn | - |
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| counterchange | (verb) cause to change places | Synonyms: interchange, transpose |
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| countercharge | (noun) a retaliatory charge | - |
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| (noun) a charge brought by an accused person against the accuser | - |
| countercheck | (noun) something that checks the correctness of a previous check | Synonyms: double check |
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| (noun) a check that restrains another check | - |
| (verb) check a second time | - |
| (verb) oppose or check by a counteraction | Synonyms: counteract |
| counterclaim | (noun) a claim filed in opposition to another claim in a legal action | - |
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| (verb) set up a claim in opposition to a previous claim | - |
| counterclockwise | (adjective) in the direction opposite to the rotation of the hands of a clock | Synonyms: anticlockwise, contraclockwise |
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| (adverb) in a direction opposite to the direction in which the hands of a clock move | Synonyms: anticlockwise |
| countercoup | (noun) a sudden and decisive overthrow of a government that gained power by a coup d'etat | - |
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| counterculture | (noun) a culture with lifestyles and values opposed to those of the established culture | - |
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| countercurrent | (noun) actions counter to the main group activity | Synonyms: crosscurrent |
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| (noun) a stretch of turbulent water in a river or the sea caused by one current flowing into or across another current | Synonyms: crosscurrent, rip, riptide, tide rip |
| counterdemonstration | (noun) a demonstration held in opposition to another demonstration | - |
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| counterdemonstrator | (noun) someone who demonstrates in opposition to another demonstration | - |
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| counterespionage | (noun) spying on the spies | - |
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| counterevidence | (noun) (philosophy, law, sciences) Evidence which tends to disprove a claim or hypothesis. | Synonyms: counter-evidence |
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| counterexample | (noun) refutation by example | - |
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| counterfactual | (adjective) going counter to the facts (usually as a hypothesis) | Synonyms: contrary to fact |
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| counterfactuality | (noun) the quality of being contrary to fact | - |
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| counterfeit | (adjective) not genuine; imitating something superior | Synonyms: imitative |
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| (noun) a copy that is represented as the original | Synonyms: forgery |
| (verb) make a copy of with the intent to deceive | Synonyms: fake, forge |
| counterfeiter | (noun) someone who makes copies illegally | Synonyms: forger |
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| counterfire | (noun) fire intended to neutralize or destroy enemy weapons | - |
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| counterfoil | (noun) the part of a check that is retained as a record | Synonyms: check stub, stub |
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| counterglow | (noun) a faint spot of light in the night sky that appears directly opposite the position of the sun; a reflection of sunlight by micrometeoric material in space | Synonyms: gegenschein |
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| counterinsurgency | (noun) actions taken by a government to defeat insurgency | Synonyms: pacification |
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| counterinsurgent | (adjective) of or relating or characteristic of actions taken by a government to defeat insurgency | - |
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| counterintelligence | (noun) intelligence activities concerned with identifying and counteracting the threat to security posed by hostile intelligence organizations or by individuals engaged in espionage or sabotage or subversion or terrorism | - |
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| counterintuitive | (adjective) contrary to what common sense would suggest | - |
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| counterintuitively | (adverb) in a counterintuitive manner | - |
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| counterirritant | (noun) a medicine applied locally to produce superficial inflammation in order to reduce deeper inflammation | - |
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| counterman | (noun) a male who attends a counter (as in a diner) | - |
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| countermand | (noun) a contrary command cancelling or reversing a previous command | - |
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| (verb) cancel officially | Synonyms: annul, lift, overturn, repeal, rescind, reverse, revoke, vacate |
| countermarch | (noun) (military) a march in the reverse direction or back along the same route | - |
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| (verb) change the order of soldiers during a march | - |
| (verb) march back along the same way | - |
| countermeasure | (noun) an action taken to offset another action | - |
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| countermine | (noun) (military) a tunnel dug to defeat similar activities by the enemy | - |
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| (verb) destroy enemy mines with one's own mines | - |
| (verb) destroy property or hinder normal operations | Synonyms: counteract, sabotage, subvert, undermine, weaken |
| countermove | (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: counterattack |
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| counteroffensive | (noun) a large scale offensive (more than a counterattack) undertaken by a defending force to seize the initiative from an attacking force | - |
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| counteroffer | (noun) an offer made by someone who has rejected a prior offer | - |
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| counterpane | (noun) decorative cover for a bed | Synonyms: bed cover, bed covering, bedcover, bedspread, spread |
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| counterpart | (noun) a duplicate copy | Synonyms: similitude, twin |
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| (noun) a person or thing having the same function or characteristics as another | Synonyms: opposite number, vis-a-vis |
| counterperson | (noun) someone who attends a counter (as in a diner) | - |
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| counterplan | (noun) a plot intended to subvert another plot | Synonyms: counterplot |
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| counterplay | (noun) (chess) an attack that is intended to counter the opponent's advantage in another part of the board | Synonyms: counterattack |
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| counterplea | (noun) a plaintiff's reply to a defendant's plea | - |
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| counterplot | (noun) a plot intended to subvert another plot | Synonyms: counterplan |
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| (verb) make a plot in response to another plot | - |
| counterpoint | (noun) a musical form involving the simultaneous sound of two or more melodies | - |
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| (verb) write in counterpoint | - |
| (verb) to show differences when compared; be different | Synonyms: contrast |
| counterpoise | (noun) a weight that balances another weight | Synonyms: balance, counterbalance, counterweight, equaliser, equalizer |
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| (verb) constitute a counterweight or counterbalance to | Synonyms: counterpose, counterweight |
| counterpoised | (adjective) brought into equipoise by means of a weight or force that offsets another | Synonyms: counterbalanced |
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| counterpoison | (noun) a remedy that stops or controls the effects of a poison | Synonyms: antidote |
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| counterpose | (verb) constitute a counterweight or counterbalance to | Synonyms: counterpoise, counterweight |
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| counterproductive | (adjective) tending to hinder the achievement of a goal | - |
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| counterproject | (noun) a project, scheme, or proposal brought forward in opposition to another, as in the negotiation of a treaty. | - |
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| counterproposal | (noun) a proposal offered as an alternative to an earlier proposal | - |
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| counterpunch | (noun) a return punch (especially by a boxer) | Synonyms: counter, parry |
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| counterreformation | (noun) a reformation intended to counter the results of a prior reformation | - |
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| counterrevolution | (noun) a revolution whose aim is to reverse the changes introduced by a previous revolution | - |
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| counterrevolutionary | (adjective) marked by opposition or antipathy to revolution | - |
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| (adjective) relating to or being a counterrevolution | - |
| (noun) a revolutionary whose aim is to reverse the changes introduced by an earlier revolution | Synonyms: counter-revolutionist, counterrevolutionist |
| counterrevolutionist | (noun) a revolutionary whose aim is to reverse the changes introduced by an earlier revolution | Synonyms: counter-revolutionist, counterrevolutionary |
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| countershot | (noun) a return shot; a retaliatory shot | - |
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| countersign | (noun) a second confirming signature endorsing a document already signed | Synonyms: countersignature |
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| (noun) a secret word or phrase known only to a restricted group | Synonyms: parole, password, watchword, word |
| (verb) add one's signature to after another's to attest authenticity | - |