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frontier

 
Noun frontier has 3 senses
  1. frontier - a wilderness at the edge of a settled area of a country; "the individualism of the frontier in Andrew Jackson's day"
    --1 is a kind of
    wilderness, wild
  2. frontier - an international boundary or the area (often fortified) immediately inside the boundary
    --2 is a kind of
    boundary, bound, bounds
    --2 has particulars: Triple Frontier
  3. frontier - an undeveloped field of study; a topic inviting research and development; "he worked at the frontier of brain science"
    --3 is a kind of
    discipline, subject, subject area, subject field, field, field of study, study, bailiwick, branch of knowledge
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