1. The amount of liquid within a container that is lost, as by leakage, during shipment or storage.
2. The amount by which a container, such as a bottle, cask, or tank, falls short of being full.
[Middle English ulage, from Old French ouillage, from ouiller, to fill up a cask, from ouil, eye, bunghole, from Latin oculus, eye; see okw- in Indo-European roots.]
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