Word Study
compos mentis
CIDE DICTIONARY
compos mentis, a. [L.].
Sane in mind; being of sound mind, memory, and understanding. [Webster 1913 Suppl.]
OXFORD DICTIONARY
compos mentis, adj. (also compos) having control of one's mind; sane.
Etymology
L
ROGET THESAURUS
compos mentis
Sanity
N sanity, soundness, rationality, sobriety, lucidity, lucid interval, senses, sober senses, right mind, sound mind, mens sana, sane, rational, reasonable, compos mentis, of sound mind, sound, sound-minded, lucid, self-possessed, sober, sober-minded, in one's sober senses, in one's right mind, in possession of one's faculties, sanely.For further exploring for "compos mentis" in Webster Dictionary Online