Webster's English Dictionary

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mortality

mor.tal.i.ty \mo.r-'tal-*t-e-\ n 1: the quality or state of being mortal  
   2: the death of large numbers  archaic  3: DEATH  4: the human race : 
   MANKIND  5a: the number of deaths in a given time or place  5b: the 
   proportion of deaths to population  5c: the number lost or the rate of loss 
   or failure