ventilation

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

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

free and open discussion of (or debate on) some question of public interest; "such a proposal deserves thorough public discussion"

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