1.
Wastage of something is the act of wasting it or the amount of it that is wasted.
...a series of measures to prevent the ~ of water...
There was a lot of ~ and many wrong decisions were hastily taken.
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2.
Wastage is the process by which part of someone’s body gets weaker or smaller because they are very ill or have not eaten enough.
This can lead to bodily weakness and muscle ~.
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3.
Wastage refers to the number of people who leave a company, college, or other organization, especially before they have completed their education or training. (BRIT)
British universities have very little ~ and their graduates are good...
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see also natural ~