1616, in the meaning defined above
Latin, literally, having mastery of one's mind
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“Compos mentis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/compos%20mentis. Accessed 2 Oct. 2022.
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History and Etymology for compos mentis
Latin, literally, having possession of one's mind
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