Definition

To constitute or form a frontier; to have a frontier; -- with on. [Obs.] Sir W. Temple.

Other Definitions

This word also has 2 other definitions:

FRONTIER (adjective)

1. Lying on the exterior part; bordering; conterminous; as, a frontier town. 2. Of or relating to a frontier. "Frontier experience." W. Irving.

FRONTIER (noun)

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...