Meaning of DEPLETION in English

DEPLETION

[noun]Steps must be taken to stop the depletion of the ozone layer/the world's tropical forests. [U]Staff depletion has led to people having to work longer hours. [U]A high level of expenditure has caused a depletion in our capital/funds. [C]

Cambridge English vocab.      Кембриджский английский словарь.