[1] : The Collaborative International Dictionary of English v.0.48

decimate \dec"imate\, v. t. imp.  p. p. decimated; p. pr. 
   vb. n. decimating. l. decimatus, p. p. of decimare to
   decimate in senses 1  2, fr. decimus tenth. see
   decimal.
   1. to take the tenth part of; to tithe. --johnson.
      1913 webster

   2. to select by lot and punish with death every tenth man of;
      as, to decimate a regiment as a punishment for mutiny.
      --macaulay.
      1913 webster

   3. to destroy a considerable part of; as, to decimate an army
      in battle; to decimate a people by disease.
      1913 webster
see also:
decimated decimating decimal 

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