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English Definitions
frontier
N
a wilderness at the edge of a settled area of a country
frontier
N
an international boundary or the area (often fortified) immediately inside the boundary
frontier
N
an undeveloped field of study; a topic inviting research and development
N
a settlement on the frontier of civilization
N
a man who lives on the frontier
N
a woman who lives on the frontier
English Definitions from WordNet 3.0
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