pe·rim·e·ter (p -r m -tr)n. 1. Mathematics a. A closed curve bounding a plane area. b. 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. [Middle English perimetre, from Latin perimetros, from Greek : peri-, peri- + metron, measure; see meter2.] per  i·metric (p r-mtrk), peri·metri·cal (-r-kl) adj.per i·metri·cal·ly adv. |
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