Boundary (plural: boundaries) may refer to: A border that encloses a space or an abstract concept Boundary in surveying is the dividing line between parcels of land, and the subject of a 'boundary survey' Boundary (cricket), the border of the field in the sport of cricket Boundary (topology), the set of points in the closure but not the interior of a subset of a topological space The conditions of a boundary value problem 'Boundary', an edge in the topology of manifolds, as in the case of a… (More on Boundary)