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Adjective: etiological  ,ee-tee-u'ló-ji-kul
Usage: N. Amer (elsewhere: aetiological)
  1. Of or relating to the philosophical study of causation
    "The etiological factors of the disease were complex and multifaceted";
    - etiologic [N. Amer], aetiological [Brit, Cdn], aetiologic [Brit, Cdn]
     
  2. Relating to the etiology of a disease
    "etiological agent";
    - etiologic [N. Amer], aetiological [Brit, Cdn], aetiologic [Brit, Cdn]

Encyclopedia: Etiological