Frontier (Noun)
Meaning 1
An undeveloped field of study; a topic inviting research and development; "he worked at the frontier of brain science".
Classification
Nouns denoting cognitive processes and contents.
Hypernyms
Meaning 2
A wilderness at the edge of a settled area of a country; "the individualism of the frontier in Andrew Jackson's day".
Classification
Nouns denoting spatial position.
Hypernyms
Meaning 3
An international boundary or the area (often fortified) immediately inside the boundary.
Classification
Nouns denoting spatial position.