1. (n.) The outer boundary of a body or figure, or the sum of all the sides.

2. (n.) An instrument for determining the extent and shape of the field of vision.

alentours ambience ambit border borderlands borderline boundaries boundary bounds bourn bourns brim brink circle circuit circumambiencies circumference circumjacencies circumscription circumstances compass confines context coordinates edge edges entourage environing circumstances environment environs fringe fringes gestalt habitat hem limitations limits marches margin metes metes and bounds milieu neighborhood outlines outposts outskirts pale parameters periphery precincts purlieus situation skirt skirts suburbs surroundings total environment verge verges vicinage vicinity