Definition
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noun : FRONTIER
Source:WordNet 3.1
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1. (
) a wilderness at the edge of a settled area of a country; "the individualism of the frontier in Andrew Jackson's day" ;
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2. (
) an international boundary or the area (often fortified) immediately inside the boundary ;
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3. (
) an undeveloped field of study; a topic inviting research and development; "he worked at the frontier of brain science" ;
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