1. Clear, distinct, and precisely established limits or boundaries between areas, territories, or concepts
The property has well-defined borders marked by a fence.
A propriedade tem fronteiras bem definidas marcadas por uma cerca.
2. In abstract contexts: clear demarcation or distinction between different domains, responsibilities, or concepts
It is important to establish well-defined boundaries between work and personal life.
É importante estabelecer fronteiras bem definidas entre trabalho e vida pessoal.