n (cricket) An edge or line marking an edge of the playing field.
n (cricket) An event whereby the ball is struck and either touches or passes over a boundary (with or without bounce | bouncing), usually resulting in an award of 4 (a four) or 6 (a six) runs respectively for the batting team.
n (topology)(context|of a set) the set of points in the closure of a set , not belonging to the interior of that set.