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TOEFL IELTS BNC: 8620 COCA: 6584
perimeter
noun [C] /pəˈrɪmɪtə(r)/
singularperimeter
pluralperimeters
  1. 1
    the outer edge of an enclosed area of ground such as a field or airport 周边;边缘
     Synonyms and related words
    Fences and boundaries: abuttals, balustrade, barbed wire...
  2. 2
    maths the total length of the sides of a shape such as a square or rectangle 周长
     Synonyms and related words
    Parts of shapes: centre, circumference, contour...

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