1. The replacement of stale or noxious air with fresh.
    • 1991, Robert DeNiro (actor), Backdraft:
      So you punched out a window for ventilation. Was that before or after you noticed you were standing in a lake of gasoline?
  2. The mechanical system used to circulate and replace air.
  3. An exchange of views during a discussion.
  4. The public exposure of an issue or topic.
  5. The bodily process of breathing; the inhalation of air to provide oxygen, and the exhalation of spent air to remove carbon dioxide.
  6. (medicine) The mechanical system used to assist breathing.
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