barrier - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

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barrier

noun [C] uk   /ˈbær.i.ər/  us   //

barrier noun [C] (FENCE)

B2 a long pole, fence, wall, or natural feature, such as a mountain or sea, that stops people from going somewhere: Barriers have been erected all along the route the Pope will take. The mountains acted as a natural barrier to the spread of the disease.
See also
UK a gate in some railway stations through which you must go to get on a train: Passengers are requested to show their tickets at the barrier.
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barrier noun [C] (OBSTACLE)

B2 anything that prevents people from being together or understanding each other: Despite the language barrier (= not speaking the same language), they soon became good friends. Shyness is one of the biggest barriers to making friends (= something that makes this difficult).
(Definition of barrier from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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