1. A fixed and officially established border between two countries, regions, or territories that is intended to be indefinite and not subject to change
The treaty established a permanent boundary between the two nations.
O tratado estabeleceu uma fronteira permanente entre as duas nações.
2. In surveying and cartography, a demarcation line that is marked and recognized by both parties as lasting and final
The permanent boundary was marked with concrete pillars along the entire border.
A fronteira permanente foi marcada com pilares de concreto ao longo de toda a divisa.