Loss by evaporation

• Atrophy — careless destruction
• The process of wasting
• Amount squandered
• Dissipation of American male covered by the Guardian
• Anything lost by wear or waste
• Natural attrition

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun COLLOCATIONS FROM OTHER ENTRIES natural wastage COLLOCATIONS FROM CORPUS ■ ADJECTIVE natural ▪ For the Army we are talking about in excess of 10,000 redundancies and much of the other reductions will occur through natural wastage . ▪ There is a natural ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1673, a hybrid from waste (v.) + -age .

Wikipedia Word definitions in Wikipedia