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circumference /sɚˈkʌmfrəns/  

  • noun
    plural -ences
    the length of a line that goes around something or that makes a circle or other round shape [count]
    Calculate the circle's circumference.
    What is the circumference of the Earth at the equator? [noncount]
    The circle is 38 inches in circumference.
    [count] :the outer edge of a shape or area
    The fence marks the circumference of the field.