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Definition of non compos mentis adjective from the Oxford Advanced Learner's Dictionary

non compos mentis

adjective
 
/ˌnɒn ˌkɒmpəs ˈmentɪs/
 
/ˌnɑːn ˌkɑːmpəs ˈmentɪs/
(also non compos)
(formal)
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  1. not in a normal mental state opposite compos mentisTopics Mental healthc2
    Word OriginLatin, literally ‘not having control of one's mind’.
See non compos mentis in the Oxford Advanced American Dictionary
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trait
noun
 
 
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