to open and expose to the free passage of air; to supply with fresh air, and remove impure air from; to air; as, to ventilate a room; to ventilate a cellar; to ventilate a mine.-to provide with a vent, or escape, for air, gas, etc.; as, to ventilate a mold, or a water-wheel bucket.-to change or renew, as the air of a room.-to winnow; to fan; as, to ventilate wheat.-to sift and examine; to bring out, and subject to penetrating scrutiny; to expose to examination and discussion; as, to ventilate questions of policy.-to give vent; to utter; to make public.