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- DictionaryCom·pos men·tis/ˌkämpəs ˈmen(t)əs/
adjective
- 1. having full control of one's mind; sane: "are you sure he was totally compos mentis?"
adjective
Latin legal phrase meaning "of unsound mind"
Non compos mentis is a Latin legal phrase that translates to "of unsound mind": nōn prefaces compos mentis, meaning "having control of one's mind." This phrase was first used in thirteenth-century English law to describe people afflicted by madness, the loss of memory or ability to reason. Wikipedia