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Synonyms
pe·rim·e·ter (pə-rĭḿĭ-tər)

[Middle English perimetre, from Latin perimetros, from Greek, peri-, peri-, + metron, measure; see meter2.]

noun 

  1. Mathematics
    1. A closed curve bounding a plane area.
    2. The length of such a boundary.
  2. The outer limits of an area. See synonyms at circumference
  3. A fortified strip or boundary usually protecting a military position.

derivatives

peŕi·met́ric
adjective
peŕi·met́ri·cal·ly
adverb