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Epidemiology

/ˌɛpɪˌdiːmiˈɒlədʒi/noun

The study of how disease is distributed in populations and what causes those patterns.

The Greek roots

ἐπί
epí
upon, among
+
δῆμος
dêmos
the people
+
λόγος
lógos
study, account

Literally: study of what is upon the people

The story of the word

ἐπιδήμιος described anything going around among the people, and one of the Hippocratic treatises is titled Ἐπιδημίαι. The modern discipline took its name in the mid-nineteenth century, when the London Epidemiological Society formed in 1850 to argue about cholera. The δῆμος at its centre is the same one inside democracy and demagogue, which is why an epidemic is defined by a population rather than by a patient.

How it travelled
Ancient Greek → scientific coinage → English
First recorded
19th century

Same family

epidemicpandemicendemicdemocracy

In a sentence

Her epidemiology training showed in the first question she asked: compared with whom?

Built on the same root

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