Origin of ullage
- the quantity of liquid lost from a container due to leakage or evaporation
- (in customs terminology) the amount of liquid remaining in a container after such loss
Word Origin for ullage
"amount by which a cask or bottle falls short of being full," late 15c., from Anglo-French ulliage (early 14c.), Anglo-Latin oliagium (late 13c.), Old French ouillage, from ouiller "to fill up (a barrel) to the bung," literally "to fill to the eye," from ueil "eye," from Latin oculus (see eye (n.)).