What does "frontier" mean?

The part of a country which borders or faces another country or unsettled region.

What is a synonym for "frontier"?

Common synonyms include: marches, anteriority, antipodes, back, back country, back of beyond.

//ˈfɹʌntɪə// name, noun, verb

name, noun, verb ·Common ·High school level

Noun

1
The part of a country which borders or faces another country or unsettled region.
"the frontier of civilization"
2
an undeveloped field of study; a topic inviting research and development wordnet
3
The most advanced or recent version of something; the leading edge.
"Near-synonyms: vanguard, state of the art"
4
an international boundary or the area (often fortified) immediately inside the boundary wordnet
5
An outwork of a fortification. obsolete
"thou hast talk'd. Of sallies and retires, of trenches, tents, Of palisadoes, frontiers, parapets"

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Verb

1
To live as pioneers on frontier territory. intransitive
2
To place on the frontier. obsolete, transitive
"now that it is no more a Border, nor frontiered with Enemies, why should such Privileges be any more continued?"

Proper Noun

1
An unincorporated community in Koochiching County, Minnesota, United States, located on the Canadian border.
2
A city in North Dakota.
3
An unincorporated community in Lincoln County, Wyoming.
4
A village in Saskatchewan, Canada.
5
A rural municipality on the US border in south-west Saskatchewan, which includes the village; in full, the Rural Municipality of Frontier No. 19.