Etymology: From aetiologia, from Ancient Greek (polytonic, á) (aitiologia), from (polytonic, á) "cause".
- The study of causes or origins.
- The known or speculated upon origin of a disease or class of diseases, of use in nosology, pathology, and prophylaxis.
- The ascertained origin of a particular case of a disease. This presumes a diagnosis, and may be relevant to a prognosis, but is distinct from both.
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