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From Middle English ulage, from Anglo-Norman ulliage, from *ullier ‎(to fill a partially empty cask), from Old French oel ‎(bunghole", literally, "eye), from Latin oculus ‎(eye).


ullage ‎(countable and uncountable, plural ullages)

  1. In a wine bottle, the empty space between the cork and the top of the wine.
  2. In a cask or barrel, the empty space, occupied by air, that is created by not completely filling the cask or barrel
  3. The topping-up of such a barrel with fresh wine
  4. In an industrial setting, the empty space in a tank, such as for fuel


ullage ‎(third-person singular simple present ullages, present participle ullaging, simple past and past participle ullaged)

  1. To gauge the amount of empty space between the top of a cask and the level of liquid inside it.