Definition of mortality
mor·tal·i·ty | \ mȯr-ˈta-lə-tē \
1: the quality or state of being mortalHer husband’s death reminded her of her own mortality.
2: the death of large numbers (as of people or animals)trying to reduce infant mortality
4: the human racethat natural extinction to which all mortality is subject— Thomas Paine
5a: the number of deaths in a given time or placeThe mortality among the infected mounted daily.
b: the proportion of deaths to populationa brain infection with a mortality rate of about 30 percent— Jane E. Brody
c: the number lost or the rate of loss or failurethe mortality rate of small businesses