circumference

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circumference

1. the boundary of a specific area or geometric figure, esp of a circle
2. the length of a closed geometric curve, esp of a circle. The circumference of a circle is equal to the diameter multiplied by π
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

circumference

[sər′kəm·fə·rəns]
(mathematics)
The length of a circle.
For a sphere, the length of any great circle on the sphere.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.