1. the amount by which a container falls short of being full
Usage: technical
2. the empty space in a partially filled container, especially a wine barrel or fuel tank
Usage: technical

Examples

• The wine barrel had significant ullage after aging.
• The fuel tank’s ullage was measured before takeoff.
• Ullage in the storage container allowed for thermal expansion.
• The inspector noted the ullage in each shipping drum.
• Proper ullage prevents overflow when liquids expand.
• The ullage space contained vapor from the stored liquid.