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English definition of “frontier”

frontier

noun     /frʌnˈtɪər/
[C] a line or border between two countriesTerritorial boundariesCountry and nationContinents and regions of the worldCountry names
the frontiers of sth the limits of what is known or what has been done before in an area of knowledge or activity: the frontiers of science and technologyDescribing the leading position
(Definition of frontier noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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