mor·tal·i·ty /mɔrˈtæləti/
 必死的命運,死亡數目,死亡率


 mor·tal·i·ty /mɔrˈtælətɪ/ 名詞
 必死性,發病率,死亡率


 Mor·tal·i·ty n.
 1. The condition or quality of being mortal; subjection to death or to the necessity of dying.
 When I saw her die,
 I then did think on your mortality.   --Carew.
 2. Human life; the life of a mortal being.
 From this instant
 There 's nothing serious in mortality.   --Shak.
 3. Those who are, or that which is, mortal; the human race; humanity; human nature.
    Take these tears, mortality's relief.   --Pope.
 4. Death; destruction.
 5. The whole sum or number of deaths in a given time or a given community; also, the proportion of deaths to population, or to a specific number of the population; death rate; as, a time of great, or low, mortality; the mortality among the settlers was alarming.
 Bill of mortality. See under Bill.
 Law of mortality, a mathematical relation between the numbers living at different ages, so that from a given large number of persons alive at one age, it can be computed what number are likely to survive a given number of years.
 Table of mortality, a table exhibiting the average relative number of persons who survive, or who have died, at the end of each year of life, out of a given number supposed to have been born at the same time.

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 mortality
      n 1: the quality or state of being mortal [ant: immortality]
      2: the ratio of deaths in an area to the population of that
         area; expressed per 1000 per year [syn: deathrate, {death
         rate, morbidity, mortality rate, fatality rate]