- 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, relating to, or located on the frontier: a frontier town.
Origin of frontier
Examples from the Web for frontier
She went ahead and flew on Frontier Flight 1143 from Cleveland back to Dallas.Ebola Nurses Are As Brave As Soldiers
October 17, 2014
Nothing but watch, that is, and prevent Kurdish reinforcements from crossing the frontier to help defend Kobani.Kobani is Falling to ISIS in Syria. Kurd Protests Explode in Turkey.
October 10, 2014
A guy with a baseball cap tells me that the frontier one closed last month.Our Trip to The Climate War's Ground Zero
September 19, 2014
At a minimum it could boost the number of troops it has patrolling the 900-kilometer frontier, Yavuz told The Daily Beast.Is NATO Ally Turkey Tacitly Fueling the ISIS War Machine?
September 8, 2014
They said that on August 23 they had arrived by train in the Rostov region of Russia near the Ukraine frontier.Kremlin Is Caught Putting Boots on the Ground in Ukraine
August 26, 2014
The agitations and vexations of other governments stop at the Austrian frontier.
Thus the Mohmands cross the frontier and the action of Shabkadr is fought.
They may throw a sidelight on the great drama of frontier war.
Thence we have followed it to Mardan and across the frontier.
The dead man, they said, had desired to be buried across the frontier.
- the region of a country bordering on another or a line, barrier, etc, marking such a boundary
- (as modifier)a frontier post
- US and Canadian
- the edge of the settled area of a country
- (as modifier)the frontier spirit
- (often plural) the limit of knowledge in a particular fieldthe frontiers of physics have been pushed back
Word Origin and History for frontier
c.1400, from Old French frontier "prow of a ship, front rank of an army" (13c.), noun use of adjective frontier "facing, neighboring," from front "brow" (see front (n.)).
Originally the front line of an army, sense of "borderland" is first attested early 15c. In reference to North America, from 1670s; 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," 1920]
Frontiersman is from 1782.