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 ) .

noun

inside , interior , minimum

noun

abuttals , ambit , barrier , beginning , border , borderland , borderline , bounds , brink , circumference , circumscription , compass , confines , edge , end , environs , extent , extremity , frame , fringe , frontier , hem , horizon , limits , line , line of demarcation , march , margin , mark , mere , mete , outline , outpost , pale , perimeter , periphery , precinct , purlieus , radius , rim , side , skirt , terminal , termination , terminus , verge , marchland , bound , bourn , define , dole , fence , hedge , limit , marge , term , wall