decimation vs mass execution

decimation

noun
  • A digital signal-processing technique for reducing the number of samples in a discrete-time signal; downsampling 

  • The creation of a new sequence comprising only every nth element of a source sequence. 

  • The killing or destruction of any large portion of a population. 

  • A tithe or the act of tithing. 

  • The killing or punishment of every tenth person, usually by lot. 

mass execution

How often have the words decimation and mass execution occurred in a corpus of books? (source: Google Ngram Viewer )