de·mos I. \ˈdēˌmäs\noun (-es) Etymology: Greek dēmos deme, populace — more at dem- 1. a.: the people of an ancient Greek usually democratic state b.sometimes capitalized: the common people : populace < demos ruled in the age of the common man > 2.: the people of a nation considered as a political unit as distinguished from a tribe or kinship group — compare ethnos II. plural of demo