To cause air to enter and circulate freely in a space. We need to ventilate the room to get rid of the paint fumes.
To express or discuss something openly, especially a grievance or complaint. She decided to ventilate her concerns about the new policy during the meeting.
To provide a space or structure with a system for circulating air. The building was ventilated with a state-of-the-art air conditioning system.
To supply a patient's lungs with air or oxygen by artificial means. The paramedics ventilated the unconscious victim until he could breathe on his own.