Frontier

n.	1.	That part of a country which fronts or faces another country or an unsettled region; the marches; the border, confine, or extreme part of a country, bordering on another country; the border of the settled and cultivated part of a country; as, the frontier of civilization.
	2.	(Fort.) An outwork. Palisadoes, frontiers, parapets. - Shak.
a.	1.	Lying on the exterior part; bordering; conterminous; as, a frontier town.
	2.	Of or relating to a frontier.
v. i.	1.	To constitute or form a frontier; to have a frontier; - with on.

Noun	1.	frontier - a wilderness at the edge of a settled area of a country; "the individualism of the frontier in Andrew Jackson's day"
	2.	frontier - an international boundary or the area (often fortified) immediately inside the boundary
	3.	frontier - an undeveloped field of study; a topic inviting research and development; "he worked at the frontier of brain science"

Berlin wall, China, Darkest Africa, God knows where, Greenland, North Pole, Outer Mongolia, Pago Pago, Pillars of Hercules, Siberia, South Pole, Thule, Tierra del Fuego, Timbuktu, Ultima Thule, Yukon, anteriority, antipodes, back country, backcountry, backwash, backwater, backwoods, bamboo curtain, bold front, boondock, boondocks, border ground, border line, bordering, borderland, borderline, bound, boundary, boundary condition, boundary line, bounding, bounds, bourn, brave face, brave front, break boundary, breakoff point, brush, bush, bush country, bushveld, ceiling, circumscription, coastal, compass, confine, cutoff, cutoff point, dark horse, deadline, delimitation, determinant, determinative, determining, display, division line, end, enigma, extreme, extremes, extremity, facade, face, facet, facia, finish, floor, fore, forefront, foreground, forehand, foreland, forepart, forequarter, foreside, forests, foreword, fringing, front, front elevation, front line, front man, front matter, front page, front view, frontage, frontal, frontier post, frontiers of knowledge, frontispiece, godforsaken place, hack, head, heading, hedge, high-water mark, hinterland, interface, iron curtain, jumping-off place, lap, limbic, limen, liminal, limit, limitation, limiting, limiting factor, limits, line, line of demarcation, littoral, low-water mark, lower limit, march, marches, marchland, marginal, mark, matter of ignorance, mete, mystery, n, nowhere, obverse, outback, outer space, outlandish, outpost, outskirts, pale, pole, preface, prefix, priority, proscenium, puzzle, remote, riddle, rimming, sealed book, skirting, start, starting line, starting point, sticks, target date, term, terminal, terminal date, terminus, terra incognita, the Great Divide, the South Seas, the boondocks, the bush, the incalculable, the moon, the sticks, the strange, the tullies, the unfamiliar, the unknowable, the unknown, three-mile limit, threshold, timbers, time allotment, twelve-mile limit, unexplored ground, unexplored territory, uninhabited region, unknown quantity, unsettled, up-country, upper limit, virgin land, virgin territory, wasteland, wild West, wilderness, wilds, window dressing, woodlands, woods, x, z

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