Circumference meaning
The circumference is defined as the distance around something round or rounded, especially the distance around the edge of a circle.
An example of circumference is the distance around the outer boundary of a circle.
noun
The length of such a boundary. The circumference of a circle is computed by multiplying the diameter by pi.
The line bounding a circle, a rounded surface, or an area suggesting a circle.
noun
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The boundary line of a circle.
The boundary line of a circle.
noun
The margin or area surrounding something.
noun
The boundary line of a figure, area, or object.
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The distance measured by this line.
noun
Origin of circumference
 Middle English from Old French circonference from Latin circumferentia from circumferēns circumferent present participle of circumferre to carry around circum circum ferre to carry bher^{1} in IndoEuropean roots
From American Heritage Dictionary of the English Language, 5th Edition

From Wiktionary