1. [ noun ] an international boundary or the area (often fortified) immediately inside the boundary
Related terms: boundary boundary triple_frontier
2. [ noun ] (geography) a wilderness at the edge of a settled area of a country

"the individualism of the frontier in Andrew Jackson's day"

Related terms: wilderness
3. [ adjective ] on the American frontier

"one of the last real frontier towns" "hardships of frontier life"

Related terms: rural
4. [ noun ] an undeveloped field of study; a topic inviting research and development

"he worked at the frontier of brain science"

Related terms: discipline
Similar spelling:   front