boundary

[boun-duh-ree, -dree]
noun, plural boundaries.
1.
something that indicates bounds or limits; a limiting or bounding line.
2.
Also called frontier. Mathematics. the collection of all points of a given set having the property that every neighborhood of each point contains points in the set and in the complement of the set.
3.
Cricket. a hit in which the ball reaches or crosses the boundary line of the field on one or more bounces, counting four runs for the batsman. Compare six ( def 5 ).

Origin:
1620–30; bound3 + -ary

transboundary, adjective

boundary, limit, parameter, variable (see synonym study at the current entry)(see usage note at parameter).


1. Boundary, border, frontier share the sense of that which divides one entity or political unit from another. Boundary in reference to a country, city, state, territory, or the like, most often designates a line on a map: boundaries are shown in red. Occasionally, it also refers to a physical feature that marks the agreed-upon line separating two political units: The Niagara River forms part of the boundary between the United States and Canada. Border is more often used than boundary in direct reference to a political dividing line; it may also refer to the region (of, for instance, a country) adjoining the actual line of demarcation: crossing the Mexican border; border towns along the Rio Grande. Frontier may refer to a political dividing line: crossed the Spanish frontier on Tuesday. It may also denote or describe the portion of a country adjoining its border with another country (towns in the Polish frontier ) or, especially in North America, the most remote settled or occupied parts of a country: the frontier towns of the Great Plains. Frontier especially in the plural, also refers to the most advanced or newest activities in an area of knowledge or practice: the frontiers of nuclear medicine.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
boundary (ˈbaʊndərɪ, -drɪ)
 
n , pl -ries
1.  something that indicates the farthest limit, as of an area; border
2.  cricket
 a.  the marked limit of the playing area
 b.  a stroke that hits the ball beyond this limit
 c.  the four runs scored with such a stroke, or the six runs if the ball crosses the boundary without touching the ground

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

boundary
1620s, from Fr., from O.Fr. bodne, from M.L. bodina, butina "boundary, boundary marker" (see bound (n.)), perhaps influenced by M.L. bonnarium "piece of land within a fixed limit." Native words were akin to mark (1).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The underside of the mantle-the boundary between it and the liquid outer core-is probably rugged terrain.
Only then can anyone consider that it has reached the outer boundary of our solar system.
Divisions and consolidations have been effected, and new boundary lines have
  been formed in other instances.
These boundary conditions allow convergence between moist maritime air and dry
  continental air.
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