Definition of irreversible adjective from the Oxford Advanced Learner's Dictionary

  

irreversible

 adjective
adjective
BrE BrE//ˌɪrɪˈvɜːsəbl//
 
; NAmE NAmE//ˌɪrɪˈvɜːrsəbl//
 
 
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that cannot be changed back to what it was before an irreversible change/decline/decision irreversible brain damage (= that will not improve) opposite reversible
See the Oxford Advanced American Dictionary entry: irreversible