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

 

derangement

 noun
noun
BrE BrE//dɪˈreɪndʒmənt//
 
; NAmE NAmE//dɪˈreɪndʒmənt//
 
[uncountable]
 
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an inability to behave and think normally, especially because of mental illness He seemed to be on the verge of total derangement.