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English definition of “bastion”

bastion

noun [C] uk   /ˈbæs.ti.ən/ us  
something that keeps or defends a belief or a way of life that is disappearing or threatened: British public schools are regarded as one of the last bastions of upper-class privilege. a part of the wall of a castle that sticks out from it in order to protect it
(Definition of bastion from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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