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ventilation

noun [U]
 
 
/ˌven.tɪˈleɪ.ʃən/ US  /-t̬əlˈeɪ-/

Definition

the movement of fresh air around a closed space, or the system that does this: Her room had poor ventilation and in summer it became unbearably stuffy. a ventilation systemVents and ventilation
(Definition of ventilation noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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