- margin, border, perimeter - the boundary line or the area immediately inside the boundary
--1 is a kind of boundary, edge, bound
- perimeter - a line enclosing a plane areas
--2 is a kind of line
- circumference, perimeter - the size of something as given by the distance around it
--3 is a kind of size
--3 has particulars: girth - circumference, perimeter - the size of something as given by the distance around it