From The Collaborative International Dictionary of English v.0.48:

Ventilation \Ven`ti*la"tion\, n. [L. ventilatio: cf. F.
   1. The act of ventilating, or the state of being ventilated;
      the art or process of replacing foul air by that which is
      pure, in any inclosed place, as a house, a church, a mine,
      etc.; free exposure to air.
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            Insuring, for the laboring man, better ventilation.
                                                  --F. W.
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   2. The act of refrigerating, or cooling; refrigeration; as,
      ventilation of the blood. [Obs.] --Harvey.
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   3. The act of fanning, or winnowing, for the purpose of
      separating chaff and dust from the grain.
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   4. The act of sifting, and bringing out to view or
      examination; free discussion; public exposure.
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            The ventilation of these points diffused them to the
            knowledge of the world.               --Bp. Hall.
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   5. The act of giving vent or expression. "Ventilation of his
      thoughts." --Sir H. Wotton.
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