frontier

the line that separates two countries or areas

frontera, límite

• the frontier between X and Y

Collocations frontier town · border patrol

• The frontier between Mexico and the United States is very long.

  La frontera entre México y Estados Unidos es muy larga.

the limit of a subject or area of knowledge

límite, frontera

• push the frontiers of sth

Collocations frontier of science · cutting-edge research

• Scientists are pushing the frontiers of medical knowledge.

  Los científicos están explorando los límites del conocimiento médico.

a remote area, especially in a country that is not fully developed or controlled by the government

frontera, región remota

• the frontier of X

Collocations frontier region · wild west

• The government has little control over the frontier regions.

  El gobierno tiene poco control sobre las regiones fronterizas.

a period in history when a country is expanding its territory and settling new areas

época de expansión territorial, colonización

• the frontier of X

Collocations frontier period · westward expansion

• The United States experienced a long frontier period.

  Los Estados Unidos vivieron una larga época de expansión territorial.