Perimeter definition

pə-rĭmĭ-tər
A defended boundary protecting a military position.
noun
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The outer limits of an area.
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The outer boundary of a figure or area.
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The perimeter is the outside line forming the boundary of some shape or something such as a plot of land or the length of that outside line.

An example of a perimeter is the line where your fence goes on the border of your yard.

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(basketball) The three-point line.
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A closed line bounding a plane area.
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The length of such a line.
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The total length of this.
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An optical instrument for testing the scope of vision and the visual powers of various parts of the retina.
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(mil.) A boundary strip where defenses are set up.
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The sum of the lengths of the segments that form the sides of a polygon.
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(mathematics) The sum of the distance of all the lengths of the sides of an object.
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The outer limits of an area. See Synonyms at circumference.
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(mathematics) The length of such a boundary.
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A fortified strip or boundary usually protecting a military position.
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An instrument for determining the extent and shape of the field of vision.
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The total length of any closed curve, such as the circumference of a circle.
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Other Word Forms

Noun

Singular:
perimeter
Plural:
perimeters

Origin of perimeter

  • Middle English perimetre from Latin perimetros from Greek peri- peri- metron measure meter2

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Ancient Greek περίμετρος (perimetros).

    From Wiktionary

Perimeter Sentence Examples

  • He was touring the perimeter, as he did daily.

  • It was the perimeter security check.

  • Guards hung back in a loose perimeter around him, but they had thus far not challenged him.

  • A portion of the northern perimeter was used for housing.

  • The proof that the area of a circle is proportional to the square of its diameter would therefore precede the proof that the perimeter is proportional to the diameter; the former property is the easier to grasp, since the conception of the length of a curved line as the limit of the sum of a number of straight lengths presents special difficulties.

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Words near perimeter in the Dictionary