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Definition of Frontier
1. Noun. A wilderness at the edge of a settled area of a country. "The individualism of the frontier in Andrew Jackson's day"
2. Noun. An international boundary or the area (often fortified) immediately inside the boundary.
3. Noun. An undeveloped field of study; a topic inviting research and development. "He worked at the frontier of brain science"
Definition of Frontier
1. 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.
2. a. Lying on the exterior part; bordering; conterminous; as, a frontier town.
3. v. i. To constitute or form a frontier; to have a frontier; -- with on.
Definition of Frontier
1. 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. ¹
2. Adjective. Lying on the exterior part; bordering; conterminous. ¹
3. Adjective. Of or relating to a frontier. ¹
¹ Source: wiktionary.com
Definition of Frontier
1. a border between two countries [n -S]