Word Definition

Frontier

  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. Lying on the exterior part; bordering; conterminous; as, a frontier town.
  3. To constitute or form a frontier; to have a frontier; -- with on.
  4. Of or relating to a frontier.
  5. An outwork.