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 the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.