This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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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.

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.

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.

adj. Lying on the exterior part; bordering; conterminous.

adj. Of or relating to a frontier.

verb-intransitive. To constitute or form a frontier; to have a frontier; -- with on.

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.

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

"About two miles from the German frontier (_frontier_ just here as well as front) an isolated hill rises out of the Lorraine meadows."

field    field of study    subject area    subject    study    discipline    subject field    bailiwick    wild    wilderness   

outwork    bordering    conterminous    border    coast   

Bombardier    Chevalier    Clear    Deere    Fear    Greer    Imagineer    Lanier    Lear    Meir   

border    coast    territory    boundary    province    settlement    fortress    capital    outpost    district