ventilation

英[,ventɪ'leɪʃ(ə)n] 美[,vɛntl'eʃən]

1. the act of supplying fresh air and getting rid of foul air

2. a mechanical system in a building that provides fresh air;

"she was continually adjusting the ventilation"

3. free and open discussion of (or debate on) some question of public interest;

"such a proposal deserves thorough public discussion"

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