Definition of boundary in English:

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Pronunciation: /ˈbound(ə)rē/

noun (plural boundaries)

1A line that marks the limits of an area; a dividing line: the eastern boundary of the wilderness the boundary between the US and Canada [as modifier]: a boundary wall
More example sentences
  • Meandering through the Oxfordshire countryside, the river marks the eastern boundary of the public part of the garden.
  • To the west of this is Chile, with the border marking the western boundary of the national park.
  • The line came to be regarded as marking the northern boundary of the area where agriculture could be safely pursued.
border, frontier, borderline, partition;
bounds, confines, limits, margins, edges, fringes;
border, periphery, perimeter
1.1 (often boundaries) A limit of a subject or sphere of activity: a community without class or political boundaries
More example sentences
  • Secondly, job security has also crossed traditional class boundaries in the last twenty years.
  • While the jet set rule the grounds, genuine golf lovers cut across class boundaries.
  • If we do away with the old subject boundaries and hierarchies and exams we open places of education up to people of all ages, all abilities.
dividing line, divide, division, borderline, cutoff point
limits, parameters, bounds, confines;
ambit, compass


Early 17th century: variant of dialect bounder, from bound2 + -er1, perhaps on the pattern of limitary.

For editors and proofreaders

Syllabification: bound·a·ry

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