perimeter

[puh-rim-i-ter]
noun
1.
the border or outer boundary of a two-dimensional figure.
2.
the length of such a boundary.
3.
a line bounding or marking off an area.
4.
the outermost limits.
5.
Military. a fortified boundary that protects a troop position.
6.
Ophthalmology. an instrument for determining the peripheral field of vision.

Origin:
1585–95; < French périmètre < Latin perimetros (feminine) < Greek perímetron (neuter). See peri-, -meter

perimeterless, adjective
perimetral, perimetric [per-uh-me-trik] , perimetrical, adjective
perimetrically, adverb
perimetry, noun

parameter, perimeter.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
perimeter (pəˈrɪmɪtə)
 
n
1.  maths
 a.  the curve or line enclosing a plane area
 b.  the length of this curve or line
2.  a.  any boundary around something, such as a field
 b.  (as modifier): a perimeter fence; a perimeter patrol
3.  a medical instrument for measuring the limits of the field of vision
 
[C16: from French périmètre, from Latin perimetros; see peri-, -meter]
 
perimetric
 
adj
 
peri'metrical
 
adj
 
peri'metrically
 
adv
 
pe'rimetry
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

perimeter
1592, "line around a figure or surface," from L. perimetros, from Gk. perimetros "circumference," from peri- "around" + metron "measure" (see meter (2)). Military sense of "boundary of a defended position" is attested from 1943.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

perimeter pe·rim·e·ter (pə-rĭm'ĭ-tər)
n.

  1. The outer limits of an area; circumference.

  2. An instrument used to measure field of vision.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
perimeter   (pə-rĭm'ĭ-tər)  Pronunciation Key 
  1. The sum of the lengths of the segments that form the sides of a polygon.

  2. The total length of any closed curve, such as the circumference of a circle.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
More and more townsfolk have awoken and come out to stand and watch
  respectfully from around the perimeters of the field.
Twelve unbearably gifted students are sitting around the table, and they
  appreciate having such perimeters established.
Instead they set up perimeters and controlled the scene.
If it is expanding it has perimeters, at present far beyond any ability of ours
  to measure.
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