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ven·ti·la·tion  (vntl-shn)
a. The replacement of stale or noxious air with fresh air.
b. The mechanical system or equipment used to circulate air or to replace stale air with fresh air.
2. See respiration.
3. Aeration or oxygenation, as of blood.

ventilation  /vntlen/  n. [U] a system, such as air openings and blowers, used to change the air in a room or building: The poor ventilation in my hotel room makes me feel sick. -n. [C] ventilator. ventilation

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