wastage

Concise Oxford English Dictionary © 2008 Oxford University Press:
wastage/ˈweɪstɪʤ/

▶noun

• 1 the action or process of wasting.

  ■ an amount wasted.

• 2 (also natural wastage) Brit. the reduction in the size of a workforce as a result of voluntary resignation or retirement rather than enforced redundancy.

  ■ the number of people leaving a job or further educational establishment before they have completed their training or education.