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frontier
noun [C] /ˈfrʌn.tɪər/ /frʌnˈtɪər/
/-ˈtɪr/ Definition
C2 a border between two countries, or (especially in the past in the US) a border between land used to grow crops where people live and wild land: 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.Territorial boundaries
(Definition of frontier noun from the Cambridge Advanced Learner's Dictionary & Thesaurus
© Cambridge University Press)
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