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fron•tier(frʌnˈtɪər, frɒn-; also, esp. Brit., ˈfrʌn tɪər)
border frontier boundary
The border between two countries is the dividing line between them.
A frontier is a border with official points for people to cross, often with guards.
You talk about one country's border or frontier with another.
The boundary of a region or area of land is its outer edge.
Don't talk about the 'boundary' of a country. Instead you talk about its borders.
|Noun||1.||frontier - a wilderness at the edge of a settled area of a country; "the individualism of the frontier in Andrew Jackson's day"|
|2.||frontier - an international boundary or the area (often fortified) immediately inside the boundary|
|3.||frontier - an undeveloped field of study; a topic inviting research and development; "he worked at the frontier of brain science"|
to push back the frontiers of knowledge → ensanchar or ampliar los límites del conocimiento