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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


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]