Fron"tier (?), n. [F. frontiere, LL. frontaria. See Front.]
1.
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. Fort.
An outwork.
[Obs.]
Palisadoes, frontiers, parapets.
Shak.
© Webster 1913.
Fron"tier, a.
1.
Lying on the exterior part; bordering; conterminous; as, a frontier town.
2.
Of or relating to a frontier.
"Frontier experience."
W. Irving.
© Webster 1913.
Fron"tier, v. i.
To constitute or form a frontier; to have a frontier; -- with on.
[Obs.]
Sir W. Temple.
© Webster 1913.