#depletion  the act of decreasing something markedly
  supertype:  step-down__decrease__diminution__reduction  the act of decreasing or reducing something
  subtype:  using_up__usingup__expenditure  the act of consuming something
     subtype:  burnup  the amount of fuel used up (as in a nuclear reactor)
  subtype:  exhaustion  the act of exhausting something entirely
  subtype:  drain  a gradual depletion; "a drain on resources"
     subtype:  drawing_off__drawingoff__drawing  act of getting or draining something such as electricity or a liquid from a source: "the drawing of water from the well"
        subtype:  derivation  drawing off water from its main channel as for irrigation
        subtype:  derivation.drawing_off  drawing of fluid or inflammation away from a diseased part of the body
     subtype:  brain_drain__braindrain  depletion or loss of intellectual and technical personnel

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