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From The Collaborative International Dictionary of English v.0.48:
Ventilation \Ven`ti*la"tion\, n. [L. ventilatio: cf. F. ventilation.] 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. [1913 Webster] Insuring, for the laboring man, better ventilation. --F. W. Robertson. [1913 Webster] 2. The act of refrigerating, or cooling; refrigeration; as, ventilation of the blood. [Obs.] --Harvey. [1913 Webster] 3. The act of fanning, or winnowing, for the purpose of separating chaff and dust from the grain. [1913 Webster] 4. The act of sifting, and bringing out to view or examination; free discussion; public exposure. [1913 Webster] The ventilation of these points diffused them to the knowledge of the world. --Bp. Hall. [1913 Webster] 5. The act of giving vent or expression. "Ventilation of his thoughts." --Sir H. Wotton. [1913 Webster]