deme Syllabification: (deme)Pronunciation: /dēm/Definition of deme noun 1a political division of Attica in ancient Greece. an administrative division in modern Greece. 2 Biology a subdivision of a population consisting of closely related plants, animals, or people, typically breeding mainly within the group. Origin:from Greek dēmos 'township'; sense 2 is an extended use dating from the 1930sdeme in other Oxford dictionaries Definition of deme in the British & World English dictionary