[n] the act of supplying fresh air and getting rid of foul air
[n] the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation
[n] a mechanical system in a building that provides fresh air; "she was continually adjusting the ventilation"
[n] free and open discussion of (or debate on) some question of public interest; "such a proposal deserves thorough public discussion"