frontier

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• February 15. 2013 from wordnet.princeton.edu

  frontier — noun — english

  a wilderness at the edge of a settled area of a country; "the individualism of the frontier in Andrew Jackson's day"

• February 27. 2016 from wordnet.princeton.edu

  frontier — noun — english

  an international boundary or the area (often fortified) immediately inside the boundary

• February 27. 2016 from wordnet.princeton.edu

  frontier — noun — english

  an undeveloped field of study; a topic inviting research and development; "he worked at the frontier of brain science"