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perimeter (noun) the total length of the outside edge of an area or a shape; the border of an enclosed piece of land.
The perimeter of a rectangle, for example, is the total of the lengths of the four sides of the rectangle. The perimeter of a circle is its circumference. The perimeter of an enclosed area is the border of the enclosed area.
- The perimeter of a quadrangle can be obtained by adding up the measurements of its four sides.
- The plants planted along the perimeter of the military camp have grown into an impressive line of trees affording a lot of shade to the area.