Frontier meaning

What does “frontier” mean? Definitions, examples, synonyms and opposites.

“frontier” is a noun with 3 meanings. Its most common meaning is: a wilderness at the edge of a settled area of a country.

frontier

a wilderness at the edge of a settled area of a country
“the individualism of the frontier in Andrew Jackson's day”
an international boundary or the area (often fortified) immediately inside the boundary
an undeveloped field of study; a topic inviting research and development
“he worked at the frontier of brain science”

Source: WordNet 3.1, Princeton University