| col | (noun) a pass between mountain peaks; geomorphological term for the lowest point on a mountain ridge between two peaks | Synonyms: gap |
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| cola | (noun) carbonated drink flavored with extract from kola nuts | Synonyms: dope |
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| colander | (noun) bowl-shaped strainer; used to wash or drain foods | Synonyms: cullender |
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| colchicine | (noun) an analgesic drug derived from the saffron plant and used to treat gout | - |
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| cold | (noun) the absence of heat | Synonyms: coldness, frigidity, frigidness, low temperature |
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| (noun) the sensation produced by low temperatures | Synonyms: coldness |
| (noun) a mild viral infection involving the nose and respiratory passages (but not the lungs) | Synonyms: common cold |
| coldcream | (noun) a cream used cosmetically (mostly by women) for softening and cleaning the skin | Synonyms: cold cream, face cream, vanishing cream |
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| coldheartedness | (noun) an absence of concern for the welfare of others | Synonyms: hardheartedness, heartlessness |
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| coldness | (noun) the absence of heat | Synonyms: cold, frigidity, frigidness, low temperature |
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| (noun) a lack of affection or enthusiasm | Synonyms: chilliness, coolness, frigidity, frigidness, iciness |
| (noun) the sensation produced by low temperatures | Synonyms: cold |
| cole | (noun) coarse curly-leafed cabbage | Synonyms: kail, kale |
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| (noun) a hardy cabbage with coarse curly leaves that do not form a head | Synonyms: borecole, Brassica oleracea acephala, colewort, kail, kale |
| coleslaw | (noun) basically shredded cabbage | Synonyms: slaw |
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| coleus | (noun) any of various Old World tropical plants of the genus Coleus having multicolored decorative leaves and spikes of blue flowers | Synonyms: flame nettle |
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| colewort | (noun) a hardy cabbage with coarse curly leaves that do not form a head | Synonyms: borecole, Brassica oleracea acephala, cole, kail, kale |
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| colic | (noun) acute abdominal pain (especially in infants) | Synonyms: gripes, griping, intestinal colic |
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| colicroot | (noun) any of several perennials of the genus Aletris having grasslike leaves and bitter roots reputed to cure colic | Synonyms: colic root, crow corn, star grass, unicorn root |
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| coliphage | (noun) a bacteriophage that infects the bacterium Escherichia coli | - |
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| coliseum | (noun) an oval large stadium with tiers of seats; an arena in which contests and spectacles are held | Synonyms: amphitheater, amphitheatre |
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| colitis | (noun) inflammation of the colon | Synonyms: inflammatory bowel disease |
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| collaboration | (noun) act of working jointly | Synonyms: coaction |
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| (noun) act of cooperating traitorously with an enemy that is occupying your country | Synonyms: collaborationism, quislingism |
| collaborationism | (noun) act of cooperating traitorously with an enemy that is occupying your country | Synonyms: collaboration, quislingism |
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| collaborationist | (noun) someone who collaborates with an enemy occupying force | Synonyms: collaborator, quisling |
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| collaborator | (noun) an associate in an activity or endeavor or sphere of common interest | Synonyms: cooperator, pardner, partner |
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| (noun) someone who collaborates with an enemy occupying force | Synonyms: collaborationist, quisling |
| (noun) someone who assists in a plot | Synonyms: confederate, henchman, partner in crime |
| collage | (noun) a paste-up made by sticking together pieces of paper or photographs to form an artistic image | Synonyms: montage |
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| (noun) any collection of diverse things | - |
| collagen | (noun) a fibrous scleroprotein in bone and cartilage and tendon and other connective tissue; yields gelatin on boiling | - |
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| collagenase | (noun) any enzyme that catalyzes the hydrolysis of collagen and gelatin | - |
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| collapse | (noun) the act of throwing yourself down; collapse; sink | Synonyms: flop |
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| (noun) a natural event caused by something suddenly falling down or caving in | - |
| (noun) a sudden large decline of business or the prices of stocks (especially one that causes additional failures) | Synonyms: crash |
| (noun) an abrupt failure of function or complete physical exhaustion | Synonyms: prostration |
| collar | (noun) the act of apprehending (especially apprehending a criminal) | Synonyms: apprehension, arrest, catch, pinch, taking into custody |
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| (noun) a figurative restraint | Synonyms: leash |
| (noun) a band that fits around the neck and is usually folded over | Synonyms: neckband |
| (noun) necklace that fits tightly around a woman's neck | Synonyms: choker, dog collar, neckband |
| (noun) a band of leather or rope that is placed around an animal's neck as a harness or to identify it | - |
| (noun) the stitching that forms the rim of a shoe or boot | Synonyms: shoe collar |
| (noun) a short ring fastened over a rod or shaft to limit, guide, or secure a machine part | - |
| (noun) anything worn or placed about the neck | - |
| (noun) (zoology) an encircling band or marking around the neck of any animal | - |
| collarbone | (noun) bone linking the scapula and sternum | Synonyms: clavicle |
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| collard | (noun) variety of kale having smooth leaves | - |
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| collards | (noun) kale that has smooth leaves | Synonyms: collard greens |
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| collateral | (noun) a security pledged for the repayment of a loan | - |
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| collation | (noun) careful examination and comparison to note points of disagreement | - |
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| (noun) assembling in proper numerical or logical sequence | - |
| (noun) a light informal meal | Synonyms: bite, snack |
| collator | (noun) a machine that selects, merges and matches decks of punch cards. | - |
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| colleague | (noun) an associate that one works with | Synonyms: co-worker, fellow worker, workfellow |
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| (noun) a person who is member of one's class or profession | Synonyms: confrere, fellow |
| collect | (noun) a short prayer generally preceding the lesson in the Church of Rome or the Church of England | - |
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| collectable | (noun) things considered to be worth collecting (not necessarily valuable or antique) | Synonyms: collectible |
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| collectibility | (noun) The quality of being subject to payment or likely to be paid. | - |
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| collectible | (noun) things considered to be worth collecting (not necessarily valuable or antique) | Synonyms: collectable |
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| collecting | (noun) the act of gathering something together | Synonyms: aggregation, assembling, collection |
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| collection | (noun) the act of gathering something together | Synonyms: aggregation, assembling, collecting |
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| (noun) a publication containing a variety of works | Synonyms: compendium |
| (noun) request for a sum of money | Synonyms: appeal, ingathering, solicitation |
| (noun) several things grouped together or considered as a whole | Synonyms: accumulation, aggregation, assemblage |
| collective | (noun) members of a cooperative enterprise | - |
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| collectivisation | (noun) the organization of a nation or economy on the basis of collectivism | Synonyms: collectivization |
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| collectivism | (noun) a political theory that the people should own the means of production | - |
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| (noun) Soviet communism | Synonyms: Bolshevism, sovietism |
| collectivist | (noun) a person who belongs to the political left | Synonyms: left-winger, leftist |
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| collectivization | (noun) the organization of a nation or economy on the basis of collectivism | Synonyms: collectivisation |
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| collector | (noun) the electrode in a transistor through which a primary flow of carriers leaves the region between the electrodes | - |
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| (noun) a crater that has collected cosmic material hitting the earth | - |
| (noun) a person who is employed to collect payments (as for rent or taxes) | Synonyms: accumulator, gatherer |
| (noun) a person who collects things | Synonyms: aggregator |
| colleen | (noun) an Irish girl | - |
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| college | (noun) a complex of buildings in which an institution of higher education is housed | - |
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| (noun) the body of faculty and students of a college | - |
| (noun) an institution of higher education created to educate and grant degrees; often a part of a university | - |
| collegian | (noun) a student (or former student) at a college or university | Synonyms: college boy, college man |
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| collembolan | (noun) any of numerous minute wingless primitive insects possessing a special abdominal appendage that allows the characteristic nearly perpetual springing pattern; found in soil rich in organic debris or on the surface of snow or water | Synonyms: springtail |
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| collet | (noun) a band or collar that holds an individual stone in a jewelry setting | - |
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| (noun) a metal cap or band placed on a wooden pole to prevent splitting | Synonyms: ferrule |
| (noun) a cone-shaped chuck used for holding cylindrical pieces in a lathe | Synonyms: collet chuck |
| collider | (noun) an accelerator in which two beams of particles are forced to collide head on | - |
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| collie | (noun) a silky-coated sheepdog with a long ruff and long narrow head developed in Scotland | - |
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| collier | (noun) someone who works in a coal mine | Synonyms: coal miner, pitman |
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| colliery | (noun) a workplace consisting of a coal mine plus all the buildings and equipment connected with it | Synonyms: pit |
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| colligation | (noun) the connection of isolated facts by a general hypothesis | - |
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| (noun) the state of being joined together | Synonyms: conjugation, conjunction, junction |
| collimation | (noun) the accurate adjustment of the line of sight of a telescope | - |
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| collimator | (noun) optical device consisting of a tube containing a convex achromatic lens at one end and a slit at the other with the slit at the focus of the lens; light rays leave the slit as a parallel beam | - |
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| (noun) a small telescope attached to a large telescope to use in setting the line of the larger one | - |
| collins | (noun) tall iced drink of liquor (usually gin) with fruit juice | Synonyms: Tom Collins |
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| collision | (noun) a conflict of opposed ideas or attitudes or goals | - |
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| (noun) an accident resulting from violent impact of a moving object | - |
| (noun) (physics) a brief event in which two or more bodies come together | Synonyms: hit |
| collocation | (noun) the act of positioning close together (or side by side) | Synonyms: apposition, juxtaposition |
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| (noun) a grouping of words in a sentence | - |
| collodion | (noun) a colorless syrupy solution of pyroxylin in ether and alcohol; used as a coating for wounds or photographic films | - |
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| colloid | (noun) a mixture with properties between those of a solution and fine suspension | - |
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| colloquialism | (noun) a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech | - |
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| colloquium | (noun) an address to an academic meeting or seminar | - |
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| (noun) an academic meeting or seminar usually led by a different lecturer and on a different topic at each meeting | - |
| colloquy | (noun) formal conversation | - |
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| (noun) a conversation especially a formal one | - |
| collotype | (noun) a photomechanical printing process that uses a glass plate with a gelatin surface that carries the image to be reproduced; can be used with one or more colors | Synonyms: collotype printing, photogelatin process |
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| collusion | (noun) secret agreement | - |
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| (noun) agreement on a secret plot | Synonyms: connivance |
| collyrium | (noun) lotion consisting of a solution used as a cleanser for the eyes | Synonyms: eye-lotion, eyewash |
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| collywobbles | (noun) severe gastroenteritis of unknown etiology; characterized by severe colic and vomiting and diarrhea | Synonyms: cholera morbus |
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| colobus | (noun) arboreal monkey of western and central Africa with long silky fur and reduced thumbs | Synonyms: colobus monkey |
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| cologne | (noun) a perfumed liquid made of essential oils and alcohol | Synonyms: cologne water, eau de cologne |
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| colon | (noun) the part of the large intestine between the cecum and the rectum; it extracts moisture from food residues before they are excreted | - |
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| (noun) a punctuation mark (:) used after a word introducing a series or an example or an explanation (or after the salutation of a business letter) | - |
| (noun) the basic unit of money in Costa Rica; equal to 100 centimos | Synonyms: Costa Rican colon |
| (noun) the basic unit of money in El Salvador; equal to 100 centavos | Synonyms: El Salvadoran colon |
| colonel | (noun) a commissioned military officer in the United States Army or Air Force or Marines who ranks above a lieutenant colonel and below a brigadier general | - |
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| colonial | (noun) a resident of a colony | - |
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| colonialism | (noun) exploitation by a stronger country of weaker one; the use of the weaker country's resources to strengthen and enrich the stronger country | - |
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| colonialist | (noun) a believer in colonialism | - |
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| colonic | (noun) a water enema given to flush out the colon | Synonyms: colonic irrigation |
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| colonisation | (noun) the act of colonizing; the establishment of colonies | Synonyms: colonization, settlement |
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| coloniser | (noun) someone who helps to found a colony | Synonyms: colonizer |
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| colonist | (noun) a person who settles in a new colony or moves into new country | Synonyms: settler |
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| colonization | (noun) the act of colonizing; the establishment of colonies | Synonyms: colonisation, settlement |
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| colonizer | (noun) someone who helps to found a colony | Synonyms: coloniser |
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| colonnade | (noun) structure consisting of a row of evenly spaced columns | - |
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| (noun) a structure composed of a series of arches supported by columns | Synonyms: arcade |
| colonoscope | (noun) an elongated fiberoptic endoscope for examining the entire colon from cecum to rectum | - |
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| colonoscopy | (noun) visual examination of the colon (with a colonoscope) from the cecum to the rectum; requires sedation | - |
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| colony | (noun) a body of people who settle far from home but maintain ties with their homeland; inhabitants remain nationals of their home state but are not literally under the home state's system of government | Synonyms: settlement |
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| (noun) a group of organisms of the same type living or growing together | - |
| (noun) (microbiology) a group of organisms grown from a single parent cell | - |
| (noun) a geographical area politically controlled by a distant country | Synonyms: dependency |
| (noun) a place where a group of people with the same interest or occupation are concentrated | - |
| colophon | (noun) a publisher's emblem printed in a book (usually on the title page) | - |
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| colophony | (noun) translucent brittle substance produced from pine oleoresin; used especially in varnishes and inks and on the bows of stringed instruments | - |
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| color | (noun) a visual attribute of things that results from the light they emit or transmit or reflect | Synonyms: coloring, colour, colouring |
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| (noun) the appearance of objects (or light sources) described in terms of a person's perception of their hue and lightness (or brightness) and saturation | Synonyms: colour |
| (noun) the timbre of a musical sound | Synonyms: coloration, colour, colouration |
| (noun) interest and variety and intensity | Synonyms: colour, vividness |
| (noun) an outward or token appearance or form that is deliberately misleading | Synonyms: colour, gloss, semblance |
| (noun) (physics) the characteristic of quarks that determines their role in the strong interaction | Synonyms: colour |
| (noun) any material used for its color | Synonyms: coloring material, colour, colouring material |
| coloradillo | (noun) handsome shrub with showy orange to scarlet or crimson flowers; Florida and West Indies to Mexico and Brazil | Synonyms: Hamelia erecta, Hamelia patens, scarlet bush, scarlet hamelia |
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| coloration | (noun) choice and use of colors (as by an artist) | Synonyms: colouration |
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| (noun) appearance with regard to color | Synonyms: colouration |
| (noun) the timbre of a musical sound | Synonyms: color, colour, colouration |
| coloratura | (noun) singing with florid ornamentation | - |
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| (noun) a lyric soprano who specializes in coloratura vocal music | Synonyms: coloratura soprano |
| colorcast | (noun) a television program that is broadcast in color | Synonyms: colourcast |
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| colored | (noun) a United States term for Blacks that is now considered offensive | Synonyms: colored person, coloured, coloured person |
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| 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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| colorimetry | (noun) quantitative chemical analysis by color using a colorimeter | Synonyms: colorimetric analysis |
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| coloring | (noun) the act or process of changing the color of something | Synonyms: colouring |
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| (noun) a visual attribute of things that results from the light they emit or transmit or reflect | Synonyms: color, colour, colouring |
| (noun) a digestible substance used to give color to food | Synonyms: colouring, food color, food coloring, food colour, food colouring |
| colorist | (noun) a painter able to achieve special effects with color | - |
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| colorlessness | (noun) the visual property of being without chromatic color | Synonyms: achromaticity, achromatism, colourlessness |
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| colors | (noun) a flag that shows its nationality | Synonyms: colours |
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| (noun) a distinguishing emblem | Synonyms: colours |