Etymology
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epidemiology (n.)

"study of epidemics, science of epidemic diseases," 1850, from Greek epidemios, literally "among the people, of one's countrymen at home" (see epidemic) + -logy. Related: Epidemiological; epidemiologist.

updated on September 08, 2014

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Definitions of epidemiology from WordNet

epidemiology (n.)
the branch of medical science dealing with the transmission and control of disease;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.