1. An area of land near or at the border between countries or regions, often characterized by sparse settlement and underdeveloped infrastructure
The frontier territory between the two nations was largely unexplored.
O território de fronteira entre as duas nações era em grande parte inexplorado.
2. A region at the edge of settled or developed territory, representing the limit of colonization or expansion
During the 19th century, the American frontier territory was pushed westward.
Durante o século XIX, o território de fronteira americano foi expandido para o oeste.
3. An area representing new or emerging fields of knowledge, technology, or development
Artificial intelligence is the frontier territory of modern computing.
A inteligência artificial é o território de fronteira da computação moderna.