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Meaning of “frontier” in the English Dictionary

"frontier" in British English

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frontiernoun [C]

uk   /ˈfrʌn.tɪər/ /frʌnˈtɪər/ us   /frʌnˈtɪr/
C2 [C] a border between two countries: Some of the frontier between Germany and Poland follows the course of the river Oder Nepal has frontiers with both India and China. They lived in a town close to the frontier.
[S] the western US where settlers began to move to live in the 19th century: The Homestead Act of 1862 gave free land to pioneers who settled the frontier.

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(Definition of frontier from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"frontier" in American English

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frontiernoun [C]

us   /frʌnˈtɪər/
a border between two countries, or (esp. in the past in the US) a border between developed land where white people live and land where Indians live or land that is wild: It was a movie about the hardships of frontier life in the northwest.
fig. A frontier is also a border between what is known and what is not known: the frontiers of knowledge
(Definition of frontier from the Cambridge Academic Content Dictionary © Cambridge University Press)
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