1) General subject: fringe
2) Military: outer boundary
3) Engineering: envelope
5) Mathematics: exterior boundary, the outer boundary of
6) Law: outer limit
7) Architecture: perimeter
8) Information technology: outline border
9) Advertising: outline
10) Business: external frontier
11) Makarov: external boundary, outer boundary (области), outer edge
Универсальный русско-английский словарь. Академик.ру. 2011.