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Definition of circumference:

  1. A circle; anything circular.
  2. The external surface of a sphere, or of any orbicular body.
  3. The line that goes round or encompasses a circular figure; a periphery.
  4. To include in a circular space; to bound.

Synonyms:

racing circuit, edge, electric circuit, tour, perimeter, lap, rim, margin, bounds, ambit, boundary, electrical circuit.

Usage examples: