|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|
|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 |
"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.