Definition of bailey noun from the Oxford Advanced Learner's Dictionary

 

bailey

 noun
noun
BrE BrE//ˈbeɪli//
 
; NAmE NAmE//ˈbeɪli//
 
 
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the open area of a castle, inside the outer wall Word Origin Middle English: probably from Old French baile ‘palisade, enclosure’, baillier ‘enclose’, perhaps from Latin baculum ‘rod, stick’.
See the Oxford Advanced American Dictionary entry: bailey