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.

Insuring, for the laboring man, better ventilation. --F. W. Robertson.

2. The act of refrigerating, or cooling; refrigeration; as, ventilation of the blood. [Obs.]

--Harvey.

3. The act of fanning, or winnowing, for the purpose of separating chaff and dust from the grain.

4. The act of sifting, and bringing out to view or examination; free discussion; public exposure.

The ventilation of these points diffused them to the knowledge of the world. --Bp. Hall.

5. The act of giving vent or expression. ``Ventilation of his thoughts.'' --Sir H. Wotton.

Source: Webster's Revised Unabridged Dictionary (1913)