adjective, san·er, san·est.

  1. free from mental derangement; having a sound, healthy mind: a sane person.
  2. having or showing reason, sound judgment, or good sense: sane advice.
  3. sound; healthy.


  1. a private nationwide organization in the U.S., established in 1957, that opposes nuclear testing and advocates international peace.


  1. sound in mind; free from mental disturbance
  2. having or showing reason, good judgment, or sound sense
  3. obsolete healthy

adj.1721, back-formation from sanity or else from Latin sanus “sound, healthy,” in figurative or transferred use, “of sound mind, rational, sane,” also, of style, “correct;” of uncertain origin. Used earlier, of the body, with the sense of “healthy” (1620s). Related: Sanely. adj.

  1. Of sound mind; mentally healthy.
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