Frontier definition

frŭn-tîr, frŭntîr
Frequency:
A region just beyond or at the edge of a settled area.
noun
14
6
The border between two countries.
noun
11
6
Any new field of learning, thought, etc. or any part of a field that is still incompletely investigated.

The frontiers of medicine.

noun
6
1
That part of a settled, civilized country which lies next to an unexplored or undeveloped region.
noun
1
1
The developing, often still uncivilized or lawless, region of a country.
noun
1
1
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Lying on the exterior part; bordering; conterminous.

A frontier town.

adjective
1
1
Of, on, or near a frontier.
adjective
2
3
An undeveloped area or field for discovery or research.

Theories on the frontier of astrophysics.

noun
1
2
An international border.
noun
1
2
The area along an international border.
noun
1
2
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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.
noun
1
2
The definition of a frontier a border between two countries, or the outer limit of what has been explored.

The border between United States and Canada is an example of a frontier.

When there is a new plot of land that has never been explored, this is an example of a new frontier.

When there is a new scientific theory that has not yet been explored, this is an example of a new frontier.

noun
2
4

Other Word Forms

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