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Meaning of “frontier” - Learner’s Dictionary

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 from the Cambridge Learner’s Dictionary © Cambridge University Press)
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A bunch of stuff about plurals
A bunch of stuff about plurals
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by Colin McIntosh One of the many ways in which English differs from other languages is its use of uncountable nouns to talk about collections of objects: as well as never being used in the plural, they’re never used with a or an. Examples are furniture (plural in German and many other languages), cutlery (plural in Italian), and

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