Etymology from Online Dictionary

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etymology
ˌɛtɪˈmɒlədʒi/
noun
noun: etymology
  1. the study of the origin of words and the way in which their meanings have changed throughout history.
    “the decline of etymology as a linguistic discipline”
    • the origin of a word and the historical development of its meaning.
      plural noun: etymologies
      “the etymology of the word ‘devil’”
      synonyms: derivation, word history, development, origin, source

Origin
late Middle English: from Old French ethimologie, via Latin from Greek etumologia, frometumologos ‘student of etymology’, from etumon, neuter singular of etumos ‘true’.