1. A boundary or outer edge that has been clearly established, marked, or determined with specific measurements or limits
The construction site has a defined perimeter marked by yellow tape.
O canteiro de obras tem um perímetro definido marcado por fita amarela.
2. In security or military contexts, a clearly established boundary within which something is contained or protected
Guards patrol the defined perimeter of the facility.
Os guardas patrulham o perímetro definido da instalação.
3. In geometry or mathematics, a boundary whose length or extent has been precisely calculated or specified
Calculate the area within the defined perimeter of the square.
Calcule a área dentro do perímetro definido do quadrado.