Mortality is the state of being mortal, or susceptible to death; the opposite of immortality.Mortality may also refer to:Mortality (band), a thrash metal band from Sydney, AustraliaMortality (book), a 2012 collection of essays by Anglo-American writer Christopher HitchensMortality (computability theory), a property of a Turing machine if it halts when run on any starting configurationMortality rate, a measure of the number of deaths in a given populationMortality drag, a negative impact that is experienced when an annuity purchase is delayedMortality/differential attrition, an error in the internal validity of a scientific study