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English definition of “frontier”

frontier

noun [C] uk   /ˈfrʌn.tɪər/ /frʌnˈtɪər/ us    /-ˈtɪr/
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.
(Definition of frontier from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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