• (British) IPA: /iːtɪˈɒlədʒi/
  • (America) IPA: /itiˈɑlədʒi/


  1. The establishment of a cause, origin, or reason for something.
    • 1999, Joyce Crick, translating Sigmund Freud, The Interpretation of Dreams, I.c:
      I do not know where the idea first arose of enlisting internal (subjective) excitations of the sensory organs as well as external sensory stimuli; but it is in fact done in all the more recent accounts of the aetiology of dreams transterm Traumätiologie.
  2. The study of causes or causation.
  3. (medicine) The study or investigation of the causes of disease; a scientific explanation for the origin of a disease.
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