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.-the act of refrigerating, or cooling; refrigeration; as, ventilation of the blood.-the act of fanning, or winnowing, for the purpose of separating chaff and dust from the grain.-the act of sifting, and bringing out to view or examination; free discussion; public exposure.-the act of giving vent or expression.