1. The act of expiring
  2. The act or process of breathing out, or forcing air from the lungs through the nose or mouth; as, respiration consists of inspiration and expiration; -- opposed to inspiration.
  3. Emission of volatile matter; exhalation.
  4. The last emission of breath; death.
  5. A coming to a close; cessation; extinction; termination; end.
  6. That which is expired; matter breathed forth; that which is produced by breathing out, as a sound.