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ventilation

noun
  1. the act of supplying fresh air and getting rid of foul air
    airing
  2. the bodily process of inhalation and exhalation
    breathingrespirationexternal respiration
  3. a mechanical system in a building that provides fresh air
    “They were continually adjusting the ventilation.”
  4. free and open discussion of (or debate on) some question of public interest
    public discussion