expiration

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The act of coming to a close; termination.
• noun The act of breathing out; exhalation.
• noun Archaic Death.

from The Century Dictionary.

• noun The act of breathing out; expulsion of air from the lungs in the process of respiration: opposed to inspiration.
• noun The last emission of breath; cessation; death.
• noun Close; end; conclusion; termination: as, the expiration of a month or year; the expiration of a contract or a lease.
• noun That which is produced by audible expiring or breathing out, as a sound.
• noun Emission of volatile matter from any substance; evaporation; exhalation: as, the expiration of oxygen by plants.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of expiring.
• noun (Physiol.) The act or process of breathing out, or forcing air from the lungs through the nose or mouth; ; -- opposed to inspiration.
• noun Emission of volatile matter; exhalation.
• noun The last emission of breath; death.
• noun A coming to a close; cessation; extinction; termination; end.
• noun That which is expired; matter breathed forth; that which is produced by breathing out, as a sound.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the act of expelling air from the lungs
• noun euphemistic expressions for death
• noun a coming to an end of a contract period