exhalation

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

• noun The act or an instance of exhaling.
• noun Something, such as air or vapor, that is exhaled.

from The Century Dictionary.

• noun The act or process of exhaling, or emitting as an effluence; evaporation.
• noun That which is exhaled; that which is emitted as or like breath, or which rises in the form of vapor; emanation; effluvium: as, exhalations from marshes, animal or vegetable bodies, decaying matter, and other substances.
• noun In heraldry, a representation of a waterspout, a torrent of rain falling from a cloud, or some similar meteorological phenomenon: a rare bearing, used as a rebus by a person whose name allows of it.

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

• noun The act or process of exhaling, or sending forth in the form of steam or vapor; evaporation.
• noun That which is exhaled, or which rises in the form of vapor, fume, or steam; effluvium; emanation
• noun archaic A bright phenomenon; a meteor.

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

• noun The act or process of exhaling, or sending forth in the form of steam or vapor; evaporation.
• noun That which is exhaled, or which rises in the form of vapor, fume, or steam; effluvium; emanation; as, exhalations from the earth or flowers, decaying matter, etc.
• noun A bright phenomenon; a meteor.

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

• noun the act of expelling air from the lungs
• noun exhaled breath