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bound +‎ -ary, Old French, from Latin.


  • (UK) IPA(key): /'ba?nd?i/
  • (US) IPA(key): /'ba?ndi/
  • (file)
  • (file)
  • Rhymes: -a?nd?i


boundary (plural boundaries)

  1. The dividing line or location between two areas.
    • 1908, W[illiam] B[lair] M[orton] Ferguson, chapter IV, in Zollenstein, New York, N.Y.: D. Appleton & Company, OCLC 731476803:
      So this was my future home, I thought! [...] Backed by towering hills, the but faintly discernible purple line of the French boundary off to the southwest, a sky of palest Gobelin flecked with fat, fleecy little clouds, it in truth looked a dear little city; the city of one's dreams.
  2. (cricket) An edge or line marking an edge of the playing field.
  3. (cricket) An event whereby the ball is struck and either touches or passes over a boundary (with or without bouncing), usually resulting in an award of 4 (four) or 6 (six) runs respectively for the batting team.
  4. (topology) (of a set) The set of points in the closure of a set , not belonging to the interior of that set.

Derived terms

Related terms


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