Definition of circumference noun from the Oxford Advanced American Dictionary

 

circumference

 noun
noun
NAmE//sərˈkʌmfrəns//
 
[countable, uncountable]
 
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a line that goes around a circle or any other curved shape; the length of this line the circumference of the earth The earth is almost 25,000 miles in circumference. compare perimeter
See the Oxford Advanced Learner's Dictionary entry: circumference