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Borrowed from Ancient Greek ἐπιδήμια (epidḗmia), neuter plural of ἐπιδήμιος (epidḗmios), from ἐπί (epí, “upon”) + δῆμος (dêmos, “people”). Reanalysed as a first-declension singular noun in Medieval Latin.

epidēmia n pl (genitive epidēmiōrum); second declension

Second-declension noun (neuter), plural only.

epidēmia f (genitive epidēmiae); first declension

First-declension noun.

Souter, Alexander (1949) “epidemia”, in A Glossary of Later Latin to 600 A.D.‎, 1st edition, Oxford: Oxford University Press, published 1957, page 125
R. E. Latham, D. R. Howlett, & R. K. Ashdowne, editors (1975–2013), “epidemia”, in Dictionary of Medieval Latin from British Sources‎, London: Oxford University Press for the British Academy, →ISBN, →OCLC

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