barrier Definition in the Cambridge English Dictionary
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Definition of “barrier” - English Dictionary

Definition of "barrier" - American English Dictionary

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barriernoun [C]

 us   /ˈbær·i·ər/
anything used or ​acting to ​block someone from going ​somewhere or from doing something, or to ​block something from ​happening: The ​SecretServiceerectedconcrete barriers around the ​WhiteHouse. Jackie Robinson was the ​African-American who ​succeeded in ​breakingmajorleague baseball’s ​color barrier (= use of ​race to ​block something from ​happening).
(Definition of barrier from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "barrier" - British English Dictionary

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barriernoun [C]

uk   /ˈbær.i.ər/  us   //

barrier noun [C] (FENCE)

B2 a ​longpole, ​fence, ​wall, or ​naturalfeature, such as a ​mountain or ​sea, that ​stopspeople from going ​somewhere: Barriers have been ​erected all along the ​route the Pope will take. The ​mountainsacted as a ​natural barrier to the ​spread of the ​disease.
See also
UK a ​gate in some ​railwaystations through which you must go to get on a ​train: Passengers are ​requested to show ​theirtickets at the barrier.
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barrier noun [C] (OBSTACLE)

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

Definition of "barrier" - Business English Dictionary

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barriernoun [C]

uk   us   /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 ​freemovement of ​people between countries.
something that ​keepspeople or things apart: The language barrier is less frightening in ​print than over the ​telephone.barrier between sb/sth (and sb/sth) Lack of ​regularcommunication 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 ​averagewage 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 from the Cambridge Business English Dictionary © Cambridge University Press)
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