- (v.i.) To constitute or form a frontier; to have a frontier; -- with on.
- (n.) 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.
- (n.) An outwork.
- (a.) Of or relating to a frontier.
- (a.) Lying on the exterior part; bordering; conterminous; as, a frontier town.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). frontier. Retrieved September 20, 2026, from http://smartdefine.org/frontier/definitions/2010378 |
| Chicago | Webster's. 2011. "frontier" http://smartdefine.org/frontier/definitions/2010378 (accessed September 20, 2026). |
| Harvard | Webster's 2011, frontier, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/frontier/definitions/2010378>. |
| MLA | Webster's. "frontier" 27 May 2011. Web. 20 September 2026. <http://smartdefine.org/frontier/definitions/2010378> |