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English definition of “barrier”

barrier

noun [C]     /ˈbæriər/
something that prevents something else from happening or makes it more difficult: barrier (to sth) In an ideal world, there would be no barriers to the free movement of people between countries. → See also non-tariff barrier, trade barrier
something that keeps people or things apart: The language barrier is less frightening in print than over the telephone.barrier between sb/sth (and sb/sth) Lack of regular communication is named time and time again as the major barrier between management and employees.
a number or measurement that is considered to be important or hard to reach: The average wage in Britain has broken the £20,000 barrier. The Dow Jones broke the 10,000 barrier early in the day, but closed down 41.85 points at 9923.42.
(Definition of barrier noun from the Cambridge Business English Dictionary © Cambridge University Press)
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