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Từ điển American Heritage Dictionary 4th
circumference
cir·cum·fer·ence (sər-kŭmʹfər-əns)n. 1. The boundary line of a circle. 2. a. The boundary line of a figure, area, or object. b. Abbr. c or circ. The length of such a boundary. [Middle English, from Old French circonference, from Latin circumferentia, from circumferēns, circumferent- present participle of circumferre, to carry around : circum-, circum- + ferre, to carry; See bher-1 in Indo-European Roots.] cir·cum'fer·enʹtial (-fə-rĕnʹshəl) adj. Synonyms: circumference, circuit, compass, perimeter, periphery These nouns refer to a line around a closed figure or area: the circumference of the earth; followed the circuit around the park; stayed within the compass of the schoolyard; the perimeter of a rectangle; a fence around the periphery of the property.
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