Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

  • 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.
  • 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.
  • n. A fort; a fortification.
  • n. The front or bordering part of anything, as the forehead.
  • n. Antagonistic or insolent bearing or aspect. [The sense of the word in the following passage is disputed.
  • n. Synonyms Border, Confine, etc. See boundary.
  • Of or pertaining to a frontier; lying on the border or exterior part; bordering: as, a frontier town.
  • Fronting; opposite.
  • To form or constitute a frontier; possess territories bordering on or constituting a frontier: with on or upon.
  • To place on the frontier; border.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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

Etymologies

Middle English frountier, from Old French frontier, from front, forehead, front; see front.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Old French fronter (whence Modern French frontière), from front. (Wiktionary)

Examples

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  • Clever crossword clue "back to front?" for "ier" entry.

    May 1, 2013