circumference

noun

the size of something as given by the distance around it
周囲の距離によって与えられるある物の大きさ
the length of the closed curve of a circle
円を作る閉じた曲線の長さ
the boundary line encompassing an area or object
地域または物を含んでいる境界線
- he had walked the full circumference of his land
  彼は自分の土地の境界線を一周歩いた
- a danger to all races over the whole circumference of the globe
  地球全体のすべての民族にとっての危機

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