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[uhl-ij] /ˈʌl ɪdʒ/
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.
Origin of ullage
late Middle English
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
Related forms
ullaged, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for ullage


the volume by which a liquid container falls short of being full
  1. the quantity of liquid lost from a container due to leakage or evaporation
  2. (in customs terminology) the amount of liquid remaining in a container after such loss
verb (transitive)
to create ullage in
to determine the amount of ullage in
to fill up ullage in
Derived Forms
ullaged, adjective
Word Origin
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History 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.)).

Online Etymology Dictionary, © 2010 Douglas Harper
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