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circulating library
circulating medium
circulation
circulatory
circulatory system
circum-
circumambient
circumambulate
circumcise
Circumcision
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circumference
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circular measure
cir·cu·lar meas·ure (plural cir·cu·lar meas·ures)


noun 
Definition:
 
unit of measurement of angles: the measurement of an angle in units radians that relate it to the angle formed in the center of a circle by a sector
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