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English definition of “barrier”

barrier

noun [C] (FENCE)    /ˈbær.i.ər/ US  //
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 crash barrierFences and rails 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.Fences and railsRailways and railway lines
(Definition of barrier noun (FENCE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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