Noah Webster's New International Dictionary of the English Language

1. (n.) The act of expiring

2. (n.) 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. (n.) Emission of volatile matter; exhalation.

4. (n.) The last emission of breath; death.

5. (n.) A coming to a close; cessation; extinction; termination; end.

6. (n.) That which is expired; matter breathed forth; that which is produced by breathing out, as a sound.