Unfilled part of a wine cask

• Liquid amount lost in storage
• To capacity, lid off, time for the remaining liquid
• Amount lacking to make a full cask
• The amount that a container (as a wine bottle or tank) lacks of being full
• Amount needed to fill a cask
• Liquid lost from a container

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 ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Ullage \Ul"lage\ (?; 48), n. [OF. eullage, ovillage, the filling up of a cask, fr. ouillier, oillier, euillier, to fill a wine cask; properly, to add oil to prevent evaporation, as to a flask that is nearly full, fr. OF. oile oil. See Oil .] (Com.) The ...

WordNet Word definitions in WordNet
n. the amount that a container (as a wine bottle or tank) lacks of being full