the amount by which the contents fall short of filling a container, as a cask or bottle.
the quantity of wine, liquor, or the like, remaining in a container that has lost part of its contents by evaporation, leakage, or use.
Rocketry. the volume of a loaded tank of liquid propellant in excess of the volume of the propellant; the space provided for thermal expansion of the propellant and the accumulation of gases evolved from it.

1400–50; late Middle English < Anglo-French ulliage; Old French ouillage, (h)eullage wine needed to fill a cask, equivalent to (a)ouill(er) to fill (a cask) (derivative of ouil eye, hole < Latin oculus) + -age -age

ullaged, adjective
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World English Dictionary
ullage (ˈʌlɪdʒ)
1.  the volume by which a liquid container falls short of being full
2.  a.  the quantity of liquid lost from a container due to leakage or evaporation
 b.  (in customs terminology) the amount of liquid remaining in a container after such loss
3.  to create ullage in
4.  to determine the amount of ullage in
5.  to fill up ullage in
[C15: from Old French ouillage filling of a cask, from ouiller to fill a cask, from ouil eye, from Latin oculus eye]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"amount by which a cask or bottle falls short of being full," late 15c., from Anglo-Fr. ulliage (early 14c.), Anglo-L. oliagium (late 13c.), O.Fr. ouillage, from ouiller "to fill up (a barrel) to the bung," lit. "to fill to the eye," from ueil "eye," from L. ochulus.
Online Etymology Dictionary, © 2010 Douglas Harper
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