[fruhn-teer, fron-; also, esp. British, fruhn-teer]
the part of a country that borders another country; boundary; border.
the land or territory that forms the furthest extent of a country's settled or inhabited regions.
Often, frontiers.
the limit of knowledge or the most advanced achievement in a particular field: the frontiers of physics.
an outer limit in a field of endeavor, especially one in which the opportunities for research and development have not been exploited: the frontiers of space exploration.
Mathematics, boundary ( def 2 ).
of, pertaining to, or located on the frontier: a frontier town.

1350–1400; Middle English frounter < Old French frontier, equivalent to front (in the sense of opposite side; see front) + -ier -ier2

frontierless, adjective
frontierlike, adjective
semifrontier, noun
transfrontier, adjective

1. See boundary. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
frontier (ˈfrʌntɪə, frʌnˈtɪə)
1.  a.  the region of a country bordering on another or a line, barrier, etc, marking such a boundary
 b.  (as modifier): a frontier post
2.  (US), (Canadian)
 a.  the edge of the settled area of a country
 b.  (as modifier): the frontier spirit
3.  (often plural) the limit of knowledge in a particular field: the frontiers of physics have been pushed back
[C14: from Old French frontiere, from front (in the sense: part which is opposite); see front]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1400, from O.Fr. fronter, from front "brow" (see front). Originally the front line of an army, sense of "borderland" is first attested 1413. In reference to N.Amer., from 1676; later with a specific sense:
"What is the frontier? ... In the census reports it is treated as the margin of that settlement which has a density of two or more to the square mile." [F.J. Turner, "The Frontier in American History"]
Frontiersman is from 1782.
Online Etymology Dictionary, © 2010 Douglas Harper
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