perimeter

IPA: pɝˈɪmʌtɝ

(mathematics) The sum of the distance of all the lengths of the sides of an object.
(mathematics) 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.

Examples of "perimeter" in Sentences

The soldiers patrolled the perimeter of the camp to ensure no intruders could enter undetected
The fence around the property stretches along the perimeter, marking the boundary of the land
The security system was set up to detect any movement along the perimeter of the building
The children were warned to stay within the perimeter of the playground for their safety
The police set up roadblocks along the perimeter of the city to prevent any escape routes for the criminals