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Boundary (plural: boundaries) may refer to any meaning below, also to border.
- Boundaries of the mind, personality trait concerning the degree of separateness or connection between mental functions and processes
- Personal boundaries, guidelines, rules or limits that a person creates to identify for him- or herself what are reasonable, safe and permissible ways for other people to behave around him or her and how he or she will respond when someone steps outside those limits
- Symbolic boundaries, a theory of how people form social groups proposed by cultural sociologists
Mathematics and physics
- Boundary (topology), the closure minus the interior of a subset of a topological space; an edge in the topology of manifolds, as in the case of a 'manifold with boundary'
- Boundary value problem, a differential equation together with a set of additional restraints called the boundary conditions
- Boundary (thermodynamic), the edge of a thermodynamic system across which heat, mass, or work can flow
- Boundaries in landscape history, the divide between areas of differing land use
- Boundary (real estate), the legal boundary between units of real property
- Boundary (cricket), the edge of the playing field, or a scoring shot where the ball is hit to or beyond that point
- Boundaries (television), a 2008 television series
- Boundary critique, a concept about the meaning and validity of propositions
- Boundary turbulence, a break in expectation of how private information is held within a group of knowledge owners
- Boundary (book), the 2006 Baen book by Eric Flint and Ryk E. Spoor
- Boundary, Derbyshire, a civil parish and hamlet in South Derbyshire, England
- Boundary, Leicestershire, a village in Leicestershire, England
- Boundary, Staffordshire, a village in Staffordshire, England
- Boundary Ranges, also known as the Boundary Range, a mountain range in British Columbia, Canada and Alaska, United States
- Boundary Country, a region of southern British Columbia, Canada
- Kootenay Boundary Regional District, a regional district in British Columbia
- West Kootenay-Boundary, a provincial electoral district in British Columbia
- Okanagan-Boundary, a former provincial electoral district in British Columbia
- Boundary-Similkameen, a former provincial electoral district in British Columbia
- Boundary Falls, British Columbia, also known as Boundary, a former railway town in the Boundary Country of British Columbia
- Boundary Waters, a region on the boundary between Ontario and Minnesota
- Stikine, British Columbia, called Boundary from 1930 to 1964, a former customs post on the Stikine River at the Alaska-British Columbia border
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