Definition of "perimeter"

perimeter

/pəˈɹɪm.ɪ.tə(ɹ)/

noun
plural perimeters
1. (mathematics) The sum of the distance of all the lengths of the sides of an object.
2. (mathematics) The length of such a boundary.
3. The outer limits of an area.
  Quotations
  In 1977, Papa Wemba decided to change the name of his housing tract, in the outskirts of Kinshasa, to Village Molokai,2 of which he declared himself traditional chief. Then, within this perimeter, he advocated a clothing style that featured, among its distinctions, a beret, and that went along with a way of walking, talking, and behaving toward others.
  2002, Frank Tenaille, translated by Steven Toussaint and Hope Sandrine, Music Is the Weapon of the Future: Fifty Years of African Popular Music, Chicago, IL: Lawrence Hill Books, page 182
4. A fortified strip or boundary usually protecting a military position.
5. An instrument for determining the extent and shape of the field of vision.