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1. The science and study of the causes of disease and their mode of operation. Cf.:pathogenesis. 2. The science of causes, causality; in common usage, cause. [G. aitia, cause, + logos, treatise, discourse]
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1) the cause or causes of a disease or abnormal condition <some types of cancer have a viral \etiology> <a multiple \etiology in which biological, psychological, and sociocultural factors all play a role (M. E. Jackson )(et al)>
2) a branch of medical science dealing with the causes and origin of diseases
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n.
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eti·ol·o·gy (e″te-olґə-je) [etio- + -logy] 1. the study or theory of the factors that cause disease and the method of their introduction to the host. 2. the causes or origin of a disease or disorder. Cf. pathogenesis.Medical dictionary. 2011.