American English

Definition of bastion noun from the Oxford Advanced American Dictionary

     

    bastion

     noun
    noun
    NAmE//ˈbæstʃən//
     
     
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  1. 1(formal) a group of people or a system that protects a way of life or a belief when it seems that it may disappear a bastion of male privilege a bastion of freedom
  2. 2 a place that military forces are defending the last bastion of American defenses in the Middle East
See the Oxford Advanced Learner's Dictionary entry: bastion