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English definition of “barrier”

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barrier

noun [C]  /ˈbær·i·ər/ us  
anything used or acting to block someone from going somewhere or from doing something, or to block something from happening: The Secret Service erected concrete barriers around the White House. Jackie Robinson was the African-American who succeeded in breaking major league baseball’s color barrier (= use of race to block something from happening).
(Definition of barrier from the Cambridge Academic Content Dictionary © Cambridge University Press)
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