Source : Webster's Revised Unabridged Dictionary (1913)

Sane \Sane\, a. [L. sanus; cf. Gr. ?, ?, safe, sound. Cf.
   {Sound}, a.]
   1. Being in a healthy condition; not deranged; acting
      rationally; -- said of the mind.

   2. Mentally sound; possessing a rational mind; having the
      mental faculties in such condition as to be able to
      anticipate and judge of the effect of one's actions in an
      ordinary maner; -- said of persons.

   Syn: Sound; healthy; underanged; unbroken.

Source : WordNet®

sane
     adj 1: mentally healthy; free from mental disorder; "appears to be
            completely sane" [ant: {insane}]
     2: marked by sound judgment; "sane nuclear policy" [syn: {reasonable}]