Unfilled part of a wine container

• Amount by which a cask falls short of being full
• Liquid amount lost in storage
• Result of liquid loss in a cask
• Unfilled part of a wine cask
• Liquid lost from a container
• Amount needed to make a full cask
• Empty portion of a bottle

Wikipedia Word definitions in Wikipedia
Ullage (from the French ouillage ) is a winemaking term that has several meanings but most commonly refers to the headspace of air between wine and the top of the container holding the wine. It can also refer to the process of evaporation that creates the ...