frontier Meaning in the Cambridge English Dictionary
Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

Meaning of “frontier” in the English Dictionary

"frontier" in British English

See all translations

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

"frontier" in American English

See all translations

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)
What is the pronunciation of frontier?