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compos mentis

[kohm-pohs men-tis; English kom-puh s-men-tis] /ˈkoʊm poʊs ˈmɛn tɪs; English ˈkɒm pəsˈmɛn tɪs/
adjective
1.
Latin. sane; mentally sound.
Origin
literally, being in full possession of one's mind
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for compos mentis

compos mentis

/ˈkɒmpəs ˈmɛntɪs/
adjective
1.
(postpositive) of sound mind; sane
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for compos mentis

Latin, literally "in command of one's mind;" from compos "having the mastery of," from com- "with" (see com-) + stem of potis "powerful, master" (see potent); + mentis, genitive of mens "mind" (see mind (n.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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compos mentis in Medicine

compos mentis com·pos men·tis (kŏm'pəs měn'tĭs)
adj.
Of sound mind; sane.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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