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English definition of “frontier”

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frontier

noun [C]  /frʌnˈtɪər/ us  
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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