Definition of "breakage"

breakage

/ˈbɹeɪkɪd͡ʒ/

noun
countable and uncountable, plural breakages
1. The act of breaking.
  Quotations
  A loader performs the important work of storing goods in the wagons and of unloading the wagons. In each case considerable skill is required to avoid breakage, and, in the case of loading, skill goes far to conserve wagon space.
  1944 March and April, T. F. Cameron, “The Working of Marshalling Yards and Goods Sheds”, in Railway Magazine, page 85
2. Something that has been broken.
3. (accounting) A service which is unused by a customer, such as an unredeemed gift card, which therefore represents a pure profit to the seller.
4. The left-over money in a pari-mutuel betting pool resulting from rounding off the payoffs, added to the pool for the next race or event or kept as profit.