Definition of irreversible adjective from the Oxford Advanced American Dictionary

  

irreversible

 adjective
adjective
NAmE//ˌɪrɪˈvərsəbl//
 
 
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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
irreversibly
 
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NAmE//ˌɪrɪˈvərsəbli//
 
adverb
See the Oxford Advanced Learner's Dictionary entry: irreversible