Definition
To allow fresh air to flow through an enclosed space in order to remove stale air, fumes, heat, or moisture and replace it with outside air.
Plain English
To let fresh air move through a closed area so the old, stale, or contaminated air gets pushed out.
Context Anchor
Seen in cockpit, cabin, engine-area, and emergency-procedure discussions where airflow is needed to clear smoke, fumes, vapor, or heat.
Derivation
From the Latin ventilare, meaning 'to fan' or 'to expose to the wind,' which itself comes from ventus, meaning 'wind.' That root explains the modern sense: moving air through a space the way wind moves through an open field.
Why Pilots Care
Proper ventilation prevents carbon monoxide buildup and maintains pilot alertness by ensuring adequate oxygen and removing contaminants.
Intuition Check
Ventilate does not just mean opening something. In aviation, it means creating useful airflow so unwanted air, fumes, smoke, vapor, or heat is carried away.
Example Sentence 1
Before entering the fuel tank to perform an inspection, the technician must ventilate it thoroughly to clear any remaining fumes.
Example Sentence 2
After an electrical smoke indication, the crew selected fresh air to ventilate the cockpit.