something that indicates bounds or limits; a limiting or bounding line.
Also called frontier. Mathematics. the collection of all points of a given set having the property that every neighborhood of each point contains points in the set and in the complement of the set.
Cricket. a hit in which the ball reaches or crosses the boundary line of the field on one or more bounces, counting four runs for the batsman. Compare six (def 5).
something that indicates the farthest limit, as of an area; border
(cricket) the marked limit of the playing area a stroke that hits the ball beyond this limit the four runs scored with such a stroke, or the six runs if the ball crosses the boundary without touching the ground