ventilation in WordNet English dictionary

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