1. In mathematics and topology, a set that contains all its boundary points; the complement of an open set
A closed region includes its boundary, unlike an open region.
Uma região fechada inclui sua fronteira, ao contrário de uma região aberta.
2. An area or space that is enclosed and not accessible to the general public
The closed region behind the construction site was restricted to authorized personnel only.
A região fechada atrás do canteiro de obras era restrita apenas ao pessoal autorizado.