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

 

compos mentis

 adjective
adjective
BrE BrE//ˌkɒmpəs ˈmentɪs//
 
; NAmE NAmE//ˌkɑːmpəs ˈmentɪs//
 
[not before noun](from Latin, formal or humorous)
 
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having full control of your mind Are you sure she was fully compos mentis when she said it? opposite non compos mentis Word Origin early 17th cent.: Latin.
See the Oxford Advanced American Dictionary entry: compos mentis

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