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English word sane comes from Latin sanus
sanus (Latin)
(of style) correct, sensible, sober, chaste. Sound in body, healthy. Sound in mind, sane.
sane (English)
Being in a healthy condition; not deranged; thinking rationally.. Mentally sound; possessing a rational mind; having the mental faculties in such condition as to be able to anticipate and judge the effect of one's actions in an ordinary manner.. Rational; reasonable; sensible.