Definition of ventilation

• 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 inclosed place, as a house, a church, a mine, etc.; free exposure to air.
• n. - The act of refrigerating, or cooling; refrigeration; as, ventilation of the blood.
• n. - The act of fanning, or winnowing, for the purpose of separating chaff and dust from the grain.
• n. - The act of sifting, and bringing out to view or examination; free discussion; public exposure.
• n. - The act of giving vent or expression.