Ventilation

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.

the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation

a mechanical system in a building that provides fresh air; "she was continually adjusting the ventilation"