noun

• The state or quality of being mortal.
• The state of being susceptible to death.
• (archaic) The quality of being punishable by death.
• (archaic) The quality of causing death.
• The number of deaths; and, usually and especially, the number of deaths per time unit (usually per year), expressed as a rate.
• Deaths resulting from an event (such as a war, epidemic or disaster).
• (biology, ecology, demography, insurance) The number of deaths per given unit of population over a given period of time.
• (figuratively) Death.
• (figuratively, archaic) Mortals collectively.