noun the last emission of breath; death.
2. expiration ·noun emission of volatile matter; exhalation.
3. expiration ·noun the act of expiring.
4. expiration ·noun a coming to a close; cessation; extinction; termination; end.
5. expiration ·noun that which is expired; matter breathed forth; that which is produced by breathing out, as a sound.
6. expiration ·noun 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.