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ventilation

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Ventilation is a circulation of air, or an opening that lets air in.

(noun)

An example of ventilation is a window being open in a house.

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See ventilation in Webster's New World College Dictionary

noun

a ventilating or being ventilated
a system or equipment for ventilating

Origin: L ventilatio

See ventilation in American Heritage Dictionary 4

noun

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.
See respiration.
Aeration or oxygenation, as of blood.

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