Definitions from Wiktionary (circumference)

▸ noun:  (geometry) The line that bounds a circle or other two-dimensional figure.
▸ noun:  (geometry) The length of such a line.
▸ noun:  (obsolete) The surface of a round or spherical object.
▸ noun:  (graph theory) The length of the longest cycle of a graph.
▸ verb:  (obsolete, transitive) To include in a circular space; to bound.
▸ Also see circumference

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