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English - English (Wordnet) dictionary (also found in English - Vietnamese, )
frontier
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Noun
  • an undeveloped field of study; a topic inviting research and development
    • he worked at the frontier of brain science
  • an international boundary or the area (often fortified) immediately inside the boundary
  • 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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