Perimeter

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.

Thesaurus Entries

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