1. A settlement or town located on or near the border between two countries or regions, typically characterized by rapid development, diverse populations, and less established infrastructure
The frontier town was filled with prospectors during the gold rush.
A cidade de fronteira estava cheia de garimpeiros durante a corrida do ouro.
2. Historically, a town established on the edge of settled territory during westward expansion
Many frontier towns in the American West were established in the 1800s.
Muitas cidades de fronteira no Oeste Americano foram estabelecidas no século XIX.