| circadian | (adjective) of or relating to biological processes occurring at 24-hour intervals | - |
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| circinate | (adjective) shaped like a ring | Synonyms: annular, annulate, annulated, doughnut-shaped, ring-shaped, ringed |
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| circle | (noun) movement once around a course | Synonyms: circuit, lap |
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| (noun) any circular or rotating mechanism | Synonyms: round |
| (noun) a road junction at which traffic streams circularly around a central island | Synonyms: rotary, roundabout, traffic circle |
| (noun) a curved section or tier of seats in a hall or theater or opera house; usually the first tier above the orchestra | Synonyms: dress circle |
| (noun) street names for flunitrazepam | Synonyms: forget me drug, Mexican valium, R-2, roach, roofy, rope, rophy |
| (noun) an unofficial association of people or groups | Synonyms: band, lot, set |
| (noun) ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point | - |
| (noun) something approximating the shape of a circle | - |
| (verb) form or draw a circle around | Synonyms: encircle |
| (verb) move in a circular path above (someone or something) | - |
| (verb) travel around something | - |
| circlet | (noun) decorated metal band worn around the head | - |
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| (noun) a small circle | - |
| circuit | (noun) a journey or route all the way around a particular place or area | Synonyms: tour |
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| (noun) movement once around a course | Synonyms: circle, lap |
| (noun) an electrical device that provides a path for electrical current to flow | Synonyms: electric circuit, electrical circuit |
| (noun) a racetrack for automobile races | Synonyms: racing circuit |
| (noun) (law) a judicial division of a state or the United States (so-called because originally judges traveled and held court in different locations); one of the twelve groups of states in the United States that is covered by a particular circuit court of appeals | - |
| (noun) an established itinerary of venues or events that a particular group of people travel to | - |
| (noun) the boundary line encompassing an area or object | Synonyms: circumference |
| (verb) make a circuit | - |
| circuitous | (adjective) deviating from a straight course | Synonyms: devious, roundabout |
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| (adjective) marked by obliqueness or indirection in speech or conduct | Synonyms: roundabout |
| circuitousness | (noun) The state of being roundabout, indirect or not to the point. | - |
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| circuitry | (noun) electronic equipment consisting of a system of circuits | - |
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| circular | (adjective) having the shape or form of a circle | Synonyms: round |
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| (adjective) describing a circle; moving in a circle | Synonyms: orbitual, rotary |
| (noun) an advertisement (usually printed on a page or in a leaflet) intended for wide distribution | Synonyms: bill, broadsheet, broadside, flier, flyer, handbill, throwaway |
| circularisation | (noun) circulating printed notices as a means of advertising | Synonyms: circularization |
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| circularise | (verb) cause to become widely known | Synonyms: broadcast, circularize, circulate, diffuse, disperse, disseminate, distribute, pass around, propagate, spread |
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| (verb) distribute circulars to | Synonyms: circularize |
| (verb) canvass by distributing letters | Synonyms: circularize |
| circularity | (noun) the roundness of a 2-dimensional figure | Synonyms: disk shape |
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| circularization | (noun) circulating printed notices as a means of advertising | Synonyms: circularisation |
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| circularize | (verb) make circular | - |
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| (verb) cause to become widely known | Synonyms: broadcast, circularise, circulate, diffuse, disperse, disseminate, distribute, pass around, propagate, spread |
| (verb) distribute circulars to | Synonyms: circularise |
| (verb) canvass by distributing letters | Synonyms: circularise |
| (verb) canvass by using a questionnaire | - |
| circularly | (adverb) in a circular manner | - |
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| circulate | (verb) cause to become widely known | Synonyms: broadcast, circularise, circularize, diffuse, disperse, disseminate, distribute, pass around, propagate, spread |
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| (verb) become widely known and passed on | Synonyms: go around, spread |
| (verb) move around freely from person to person or from place to place | - |
| (verb) move through a space, circuit or system, returning to the starting point | - |
| (verb) cause to be distributed | Synonyms: distribute, pass around, pass on |
| (verb) cause to move in a circuit or system | - |
| circulating | (adjective) passing from one to another | - |
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| circulation | (noun) the spread or transmission of something (as news or money) to a wider group or area | - |
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| (noun) the dissemination of copies of periodicals (as newspapers or magazines) | - |
| (noun) free movement or passage (as of cytoplasm within a cell or sap through a plant) | - |
| (noun) movement through a circuit; especially the movement of blood through the heart and blood vessels | - |
| (noun) number of copies of a newspaper or magazine that are sold | - |
| (noun) (library science) the count of books that are loaned by a library over a specified period | - |
| circulative | (adjective) of or relating to circulation | Synonyms: circulatory |
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| circulatory | (adjective) relating to circulatory system or to circulation of the blood | - |
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| (adjective) of or relating to circulation | Synonyms: circulative |
| circumambulate | (verb) walk around something | Synonyms: walk around |
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| circumboreal | (adjective) comprising or throughout far northern regions | Synonyms: boreal |
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| circumcise | (verb) cut the foreskin off male babies or teenage boys | - |
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| (verb) cut the skin over the clitoris | - |
| circumcision | (noun) the act of circumcising; surgical removal of the foreskin of males | - |
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| (noun) the act of circumcising performed on males eight days after birth as a Jewish and Muslim religious rite | - |
| circumduction | (noun) a circular movement of a limb or eye | - |
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| circumference | (noun) the size of something as given by the distance around it | Synonyms: perimeter |
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| (noun) the length of the closed curve of a circle | - |
| (noun) the boundary line encompassing an area or object | Synonyms: circuit |
| circumferent | (adjective) closely encircling | Synonyms: encompassing, surrounding |
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| circumferential | (adjective) lying around or just outside the edges or outskirts | - |
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| circumflex | (noun) a diacritical mark (^) placed above a vowel in some languages to indicate a special phonetic quality | - |
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| circumfuse | (verb) spread something around something | - |
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| circumlocution | (noun) a style that involves indirect ways of expressing things | Synonyms: ambage, periphrasis |
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| (noun) an indirect way of expressing something | Synonyms: indirect expression |
| circumlocutious | (adjective) roundabout and unnecessarily wordy | Synonyms: ambagious, circumlocutory, periphrastic |
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| circumlocutory | (adjective) roundabout and unnecessarily wordy | Synonyms: ambagious, circumlocutious, periphrastic |
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| circumnavigate | (verb) travel around, either by plane or ship | Synonyms: compass |
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| circumnavigation | (noun) traveling around something (by ship or plane) | - |
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| circumpolar | (adjective) located or found throughout a polar region | - |
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| (adjective) (of a celestial body) continually visible above the horizon during the entire 360 degrees of daily travel | - |
| circumscribe | (verb) restrict or confine within limits | Synonyms: confine to, limit |
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| (verb) draw a line around | - |
| (verb) to draw a geometric figure around another figure so that the two are in contact but do not intersect | - |
| circumscribed | (adjective) subject to limits or subjected to limits | Synonyms: limited |
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| circumscription | (noun) the act of circumscribing | - |
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| circumspect | (adjective) heedful of potential consequences | Synonyms: discreet |
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| circumspection | (noun) the trait of being circumspect and prudent | Synonyms: caution |
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| (noun) knowing how to avoid embarrassment or distress | Synonyms: discreetness, discretion, prudence |
| circumspectly | (adverb) in a cagey manner | Synonyms: cagily |
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| circumstance | (noun) information that should be kept in mind when making a decision | Synonyms: condition, consideration |
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| (noun) formal ceremony about important occasions | - |
| (noun) a condition that accompanies or influences some event or activity | - |
| (noun) the set of facts or circumstances that surround a situation or event | Synonyms: context, setting |
| circumstances | (noun) a person's financial situation (good or bad) | - |
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| (noun) your overall circumstances or condition in life (including everything that happens to you) | Synonyms: destiny, fate, fortune, lot, luck, portion |
| circumstantial | (adjective) fully detailed and specific about particulars | - |
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| circumstantially | (adverb) insofar as the circumstances are concerned | - |
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| (adverb) without advance planning | Synonyms: accidentally, by chance, unexpectedly |
| (adverb) in minute detail | Synonyms: minutely |
| (adverb) according to circumstances | - |
| circumstantiate | (verb) give circumstantial evidence for | - |
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| circumvallate | (verb) surround with or as if with a rampart or other fortification | - |
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| circumvent | (verb) avoid or try to avoid fulfilling, answering, or performing (duties, questions, or issues) | Synonyms: dodge, duck, elude, evade, fudge, hedge, parry, put off, sidestep, skirt |
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| (verb) beat through cleverness and wit | Synonyms: beat, outfox, outsmart, outwit, overreach |
| (verb) surround so as to force to give up | Synonyms: beleaguer, besiege, hem in, surround |
| circumvention | (noun) the act of evading by going around | - |
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| circumvolute | (verb) wind or turn in volutions, especially in an inward spiral, as of snail | - |
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| circumvolution | (noun) the act of turning or winding or folding around a central axis | - |
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| circumvolve | (verb) cause to turn on an axis or center | Synonyms: rotate |
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| circus | (noun) a performance given by a traveling company of acrobats, clowns, and trained animals | - |
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| (noun) a frenetic disorganized (and often comic) disturbance suggestive of a large public entertainment | Synonyms: carnival |
| (noun) an arena consisting of an oval or circular area enclosed by tiers of seats and usually covered by a tent | - |
| (noun) (antiquity) an open-air stadium for chariot races and gladiatorial games | - |
| (noun) a travelling company of entertainers; including trained animals | - |