frontier

Noun
  1. A wilderness at the edge of a settled area of a country (synset 108522423)
    "the individualism of the frontier in Andrew Jackson's day"
    is a type of: wild, wilderness - a wild and uninhabited area left in its natural condition
  2. An international boundary or the area (often fortified) immediately inside the boundary (synset 108518135)
    is a type of: bound, boundary, bounds - the line or plane indicating the limit or extent of something
    specific instances: triple frontier - the border area where Argentina and Brazil and Paraguay meet; an active South American center for contraband and drug trafficking and money laundering; a suspected locale for Islamic extremist groups
  3. An undeveloped field of study;
    A topic inviting research and development (synset 106007230)
    "he worked at the frontier of brain science"
    is a type of: bailiwick, discipline, field, field of study, study, subject, subject area, subject field - a branch of knowledge

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