Also means
death rate
Usage Note
Mortalidad is an abstract noun used in medical, demographic, and public-health contexts; the related adjective is mortal. Contrast mortalidad infantil (infant mortality) with tasa de mortalidad (mortality rate). It denotes the rate or incidence of death, whereas muerte is a single, specific death.
Examples
"La mortalidad infantil ha bajado mucho."
Natural Translation
Infant mortality has fallen a great deal.

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