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circumference

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noun British English pronunciation: circumference /sə(r)ˈkʌmf(ə)rəns/ 
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singularcircumference
pluralcircumferences
  1. [countable/uncountable] the distance measured around the edge of a circle or a round object or area

    a circle with a circumference of 2cm

    The island is 50 miles in circumference.

    1. a.
      [countable] [usually singular] the edge of a circle or a round object or area

      The lamps threw deep shadows beyond the circumference of the pit.

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