Definitions for: Ullage

[n] the amount that a container (as a wine bottle or tank) lacks of being full

Webster (1913) Definition: 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 amount which a vessel, as a cask, of liquor lacks of
being full; wantage; deficiency.

See Also: indefinite quantity