Today's Word of the Day means...


[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.
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. 2014.
Cite This Source
Examples for ullage
  • The model accounts for the change in the ullage volume due to expulsion of the propellant.
  • The minimum allowable five-minute final pressure is based on the system ullage and pressure decay equations.
  • It must understand ullage space needed to accommodate expansion during temperature cycling.
  • Calculate the ullage space for each tank by subtracting the gasoline gallonage present from the actual tank capacity.
  • The system consists of catalyst based ullage treatment system which produces inert gases.
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for ullage
"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
Cite This Source

Word of The Day

Difficulty index for ullage

Few English speakers likely know this word

Word Value for ullage

Scrabble Words With Friends