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2 definitions found
 for Vital capacity
From The Collaborative International Dictionary of English v.0.48 :

  Vital \Vi"tal\, a. [F., fr. L. vitalis, fr. vita life; akin to
     vivere to live. See Vivid.]
     1. Belonging or relating to life, either animal or vegetable;
        as, vital energies; vital functions; vital actions.
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     2. Contributing to life; necessary to, or supporting, life;
        as, vital blood.
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              Do the heavens afford him vital food? --Spenser.
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              And vital virtue infused, and vital warmth.
                                                    --Milton.
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     3. Containing life; living. "Spirits that live throughout,
        vital in every part." --Milton.
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     4. Being the seat of life; being that on which life depends;
        mortal.
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              The dart flew on, and pierced a vital part. --Pope.
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     5. Very necessary; highly important; essential.
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              A competence is vital to content.     --Young.
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     6. Capable of living; in a state to live; viable. [R.]
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              Pythagoras and Hippocrates . . . affirm the birth of
              the seventh month to be vital.        --Sir T.
                                                    Browne.
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     Vital air, oxygen gas; -- so called because essential to
        animal life. [Obs.]
  
     Vital capacity (Physiol.), the breathing capacity of the
        lungs; -- expressed by the number of cubic inches of air
        which can be forcibly exhaled after a full inspiration.
  
     Vital force. (Biol.) See under Force. The vital forces,
        according to Cope, are nerve force (neurism), growth force
        (bathmism), and thought force (phrenism), all under the
        direction and control of the vital principle. Apart from
        the phenomena of consciousness, vital actions no longer
        need to be considered as of a mysterious and unfathomable
        character, nor vital force as anything other than a form
        of physical energy derived from, and convertible into,
        other well-known forces of nature.
  
     Vital functions (Physiol.), those functions or actions of
        the body on which life is directly dependent, as the
        circulation of the blood, digestion, etc.
  
     Vital principle, an immaterial force, to which the
        functions peculiar to living beings are ascribed.
  
     Vital statistics, statistics respecting the duration of
        life, and the circumstances affecting its duration.
  
     Vital tripod. (Physiol.) See under Tripod.
  
     Vital vessels (Bot.), a name for latex tubes, now disused.
        See Latex.
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From WordNet (r) 3.0 (2006) :

  vital capacity
      n 1: 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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