frontier Meaning in the Cambridge English Dictionary
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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   /-ˈtɪr/
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 ​townclose to the frontier. [S] the ​western US where settlersbegan to ​move to ​live in the 19th ​century: The Homestead Act of 1862 gave ​freeland 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 ​developedland where ​whitepeoplelive and ​land where ​Indianslive 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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