Definition of expiration

• n. - The act of expiring
• 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.
• n. - Emission of volatile matter; exhalation.
• n. - The last emission of breath; death.
• n. - A coming to a close; cessation; extinction; termination; end.
• n. - That which is expired; matter breathed forth; that which is produced by breathing out, as a sound.