Meaning of “frontier” in the English Dictionary

british 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)