- something that indicates bounds or limits; a limiting or bounding line.
- 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.
- 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 of boundary
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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for boundary
First you have to convince people to accept your version of the boundary between law and politics.A Reminder: Our Justices are Politicians in Robes
November 13, 2014
We need to take a razor and make a boundary in the shaving foam, people.Leo, the Beard Has to Go: When a Man’s Facial Hair Reaches Crisis Point
September 22, 2014
We also need to cross the boundary between environmental and non-environmental issues.Green Politics Has to Get More Radical, Because Anything Less Is Impractical
April 26, 2014
What it cannot do is cross that boundary—not a geographical boundary for once—beyond which a democratic state has no business.A Hebrew Democratic State for All Its Citizens
October 3, 2013
My life goal is the expansion of human knowledge, and the elimination of the earth-moon system as the boundary of human influence.Bradley Manning’s Political Dreams: New Biography of Accused WikiLeaker
May 2, 2012
They are like explorers who should mistake a boundary for the interior of a continent.
They are crossing the boundary between the first childhood and the second.
The seventh of these hath a bough which shoots over the boundary wall.Micah Clarke
Arthur Conan Doyle
Right ahead was a stone marker which he knew marked the boundary of 150 Nevada.Louisiana Lou
William West Winter
The misfortune then was that no boundary stones could be found.Fruitfulness
- something that indicates the farthest limit, as of an area; border
- the marked limit of the playing area
- a stroke that hits the ball beyond this limit
- 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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for boundary
Online Etymology Dictionary, © 2010 Douglas Harper