What is another word for "circumference"?

Roget's Thesaurus (1911) lists these synonyms for "circumference": about, all, ambient, ambit, and, around, atmosphere, baldric, band, banlieue, begird, belt, beset, border, cingle, circlet, circuit, circumambient, circumferential, circumfluent, circumjacence, circumjacent, circumscribe, circumvent, clasp, coast, compass, contour, cordon, edge, embrace, encircle, enclose, encompass, encompassment, engird, entourage, environ, environment, environs.