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frontier
WIKTIONARY
frontier
Noun
  • The part of a country which borders or faces another country or unsettled region
  • An outwork of a fortification. obsolete
Adjective
  • Lying on the exterior part; bordering; conterminous.
Frontier
Proper noun
  • An unincorporated community in Minnesota.
  • A city in North Dakota.
  • A village in Saskatchewan.