frontier

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Noun frontier has 3 senses

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
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
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

frontal sinus frontal suture frontally frontbencher frontbenchers frontera fronti frontier-dissolving frontier frontier science frontier settlement frontieres frontiers frontiersman frontierswoman fronting frontispiece

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