Individual #historical_linguistics__diachronic_linguistics__comparative_linguistics__comparativelinguistic  the study of linguistic change
  >part of:  #linguistics  the scientific study of language
  part:  #sound_law
  url:  http://en.wikipedia.org/wiki/Historical_linguistics
  >part:  #etymology.studies  the study of the sources and development of words
     >part:  #lexicostatistics  a statistical technique used in glottochronology; used to estimate how long ago different languages evolved from a common source language

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