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Ullage

This word is used in two senses. Originally, it meant the difference between the capacity of a cask and its actual contents; in Customs terminology il is now used for the actual contents (the difference is called the vacuity). In marine insurance, the difference is still known as ‘ullage’, is not usually considered a loss and is not covered by the insurance policy.

Reference: The Penguin Business Dictionary, 3rd edt.