frontier
/frʌnˈtɪər/ n [C]Definition
› 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 n from the Cambridge Academic Content Dictionary
© Cambridge University Press)
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