noun, plural ae·ti·ol·o·gies.

  1. etiology.

noun, plural e·ti·ol·o·gies.

  1. Pathology.
    1. the study of the causes of diseases.
    2. the cause or origin of a disease.
  2. the study of causation.
  3. any study of causes, causation, or causality, as in philosophy, biology, or physics.

noun plural -gies

  1. the philosophy or study of causation
  2. the study of the causes of diseases
  3. the cause of a disease

noun plural -gies

  1. a variant spelling of aetiology

“science of causes or causation,” 1550s, from Late Latin aetiologia, from Greek aitiologia “statement of cause,” from aitia “cause” + -logia “a speaking” (see -logy). Related: Etiologic; etiological.


  1. The science and study of the causes or origins of disease.
  2. The cause or origin of a disease or disorder as determined by medical diagnosis.

  1. The cause or origin of a disease, condition, or constellation of symptoms or signs, as determined by medical diagnosis or research.
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