1. (n.) 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 enclosed place, as a house, a church, a mine, etc.; free exposure to air.

2. (n.) The act of refrigerating, or cooling; refrigeration; as, ventilation of the blood.

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

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

5. (n.) The act of giving vent or expression.

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