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