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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[edit]

  • 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


Place names[edit]