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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. An international border.
  2. n. The area along an international border.
  3. n. A region just beyond or at the edge of a settled area.
  4. n. An undeveloped area or field for discovery or research: theories on the frontier of astrophysics.

Century Dictionary and Cyclopedia

  1. n. That part of a country which fronts or faces another country; the confines or extreme part of a country bordering on another country; the marches; the border.
  2. n. That part of a country which forms the border of its settled or inhabited regions: as (before the settlement of the Pacific coast), the western frontier of the United States.
  3. n. A fort; a fortification.
  4. n. The front or bordering part of anything, as the forehead.
  5. n. Antagonistic or insolent bearing or aspect. [The sense of the word in the following passage is disputed.
  6. n. Synonyms Border, Confine, etc. See boundary.
  7. Of or pertaining to a frontier; lying on the border or exterior part; bordering: as, a frontier town.
  8. Fronting; opposite.
  9. To form or constitute a frontier; possess territories bordering on or constituting a frontier: with on or upon.
  10. To place on the frontier; border.

Wiktionary

  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. adj. Lying on the exterior part; bordering; conterminous.
  3. adj. Of or relating to a frontier.

GNU Webster's 1913

  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.
  2. n. An outwork.
  3. adj. Lying on the exterior part; bordering; conterminous.
  4. adj. Of or relating to a frontier.
  5. v. To constitute or form a frontier; to have a frontier; -- with on.

WordNet 3.0

  1. n. an undeveloped field of study; a topic inviting research and development
  2. n. a wilderness at the edge of a settled area of a country
  3. n. an international boundary or the area (often fortified) immediately inside the boundary

Etymologies

  1. Middle English frountier, from Old French frontier, from front, forehead, front; see front.

Examples

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‘frontier’ has been looked up 1613 times, loved by 2 people, added to 21 lists, and has a Scrabble score of 11.