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boundary Syllabification: bound·a·ry
Pronunciation: /ˈbound(ə)rē/

Definition of boundary in English:

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.
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.


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

Definition of boundary in:
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