fron·tier /ˌfrʌnˈtɪr, ˈfrʌnˌ, frɑnˈ, ˈfrɑnˌ/
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. [Obs.]
Palisadoes, frontiers, parapets. --Shak.
1. Lying on the exterior part; bordering; conterminous; as, a frontier town.
2. Of or relating to a frontier. “Frontier experience.”
Fron·tier, v. i. To constitute or form a frontier; to have a frontier; -- with on. [Obs.]
n 1: a wilderness at the edge of a settled area of a country;
"the individualism of the frontier in Andrew Jackson's
2: an international boundary or the area (often fortified)
immediately inside the boundary
3: an undeveloped field of study; a topic inviting research and
development; "he worked at the frontier of brain science"