DICT.TW Dictionary Taiwan

 decimation
 每十人殺一人,大批殺害

 Dec·i·ma·tion n.
 1. A tithing. [Obs.]
 2. A selection of every tenth person by lot, as for punishment.
 3. The destruction of any large proportion, as of people by pestilence or war.
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 decimation
      n : destroying or killing a large part of the population
          (literally every tenth person as chosen by lot)