perimeter

Plural: perimeters

Noun

• the boundary line or the area immediately inside the boundary
• a line enclosing a plane areas
• the size of something as given by the distance around it
• The sum of the distance of all the lengths of the sides of an object.
• The length of such a boundary.
• The outer limits of an area.
• A fortified strip or boundary usually protecting a military position.
• An instrument for determining the extent and shape of the field of vision.

Synonyms

border, circumference, margin, premises