Frontier Definition

frŭn-tîr, frŭntîr
frontiers
noun
The border between two countries.
Webster's New World
The area along an international border.
American Heritage
That part of a settled, civilized country which lies next to an unexplored or undeveloped region.
Webster's New World
The developing, often still uncivilized or lawless, region of a country.
Webster's New World
Any new field of learning, thought, etc. or any part of a field that is still incompletely investigated.
The frontiers of medicine.
Webster's New World
Antonyms:
adjective
Of, on, or near a frontier.
Webster's New World
Lying on the exterior part; bordering; conterminous.
A frontier town.
Wiktionary

Other Word Forms of Frontier

Noun

Singular:
frontier
Plural:
frontiers

Origin of Frontier

  • Middle English frountier from Old French frontier from front forehead, front front

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Old French fronter (whence Modern French frontière), from front.

    From Wiktionary

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