adj of or relating to a frontier.
2. frontier ·noun an outwork.
3. frontier ·vi to constitute or form a frontier; to have a frontier;
with on.
4. frontier ·adj lying on the exterior part; bordering; conterminous; as, a frontier town.
5. frontier ·noun 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.