1. A boundary line that has been clearly established, marked, and agreed upon between two territories, regions, or jurisdictions
The treaty established a defined border between the two nations.
O tratado estabeleceu uma fronteira definida entre as duas nações.
2. In design and user interface, a visible edge or outline that clearly separates one element from another
The button has a defined border to make it stand out from the background.
O botão tem uma borda definida para se destacar do fundo.