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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The amount of air that can be forcibly expelled from the lungs after breathing in as deeply as possible.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The maximum volume of air that can be discharged from the lungs following maximum inspiration.

from the GNU version of the Collaborative International Dictionary of English

  • adj. the breathing capacity of the lungs; -- expressed by the number of cubic inches of air which can be forcibly exhaled after a full inspiration.

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

  • n. the maximum amount of air that can be exhaled after a maximum inhalation (usually tested with a spirometer); used to determine the condition of lung tissue


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  • The maximum volume of air that a person can exhale after maximum inhalation. It can also be the maximum volume of air that a person can inhale after maximum exhalation. (Wikipedia)

    May 29, 2008