mor‧tal‧i‧ty plural mortalities
1 [uncountable] also mortality rateSSMX the number of deaths during a particular period of time among a particular type or group of people:
Mortality from heart disease varies widely across the world.
infant/child/maternal/adult mortality
an appallingly high infant mortality rate (=number of babies who die)
2 [uncountable] the condition of being human and having to die [≠ immortality]:
My mother's death forced me to face the fact of my own mortality.
3 [countable] technical a death:
mortalities from cancer

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