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ullage

[ uhl-ij ]
/ ˈʌl ɪdʒ /
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noun

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.

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Origin of ullage

First recorded in 1400–50; late Middle English ulage, oylage, from Anglo-French ulliage, from Old French ouillage, (h)eullage “wine needed to fill a cask,” equivalent to ouill(er), (a)ouill(er) “to fill (a cask)” (derivative of ouil “eye, hole, bunghole,” from Latin oculus ) + -age; see origin at eye, -age
ullaged, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for ullage

ullage
/ (ˈʌlɪdʒ) /

noun

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 (tr)

to create ullage in
to determine the amount of ullage in
to fill up ullage in
ullaged, adjective
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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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