ventilation

(noun) the act of supplying fresh air and getting rid of foul air. Synonyms: airing.

(noun) a mechanical system in a building that provides fresh air. Synonyms: ventilation system, ventilating system. Example: "She was continually adjusting the ventilation."

(noun) free and open discussion of (or debate on) some question of public interest. Synonyms: public discussion. Example: "Such a proposal deserves thorough public discussion."

(noun) the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation. Synonyms: breathing, external respiration, respiration.