pleb-

1. People, the common people, the masses, the lower classes or orders.
2. All of those Roman citizens who were not patricians (upper classes) were plebeians. By the time of Gaius Marius, c. 110 B.C., there were very few politically unimportant posts which remained as strictly the province of the patricians.
3. One of the ordinary citizens of ancient Rome as distinct from the patricians.
4. Someone who behaves in a coarse or crude manner, and has common or vulgar tastes; especially, someone from a lower social class.

Plebiscite is used to mean a vote by a whole electorate to decide a question of importance; a referendum; a public expression of the will or opinion of a whole community.

In history, a law enacted by the plebs or ordinary citizens of ancient Rome gathered in assembly. Also as an adjective: plebiscitary

1. Belonging to, or pertaining to, the common people.
2. A reference to, or belonging to, the ancient Roman plebs.
3. Common, commonplace, or vulgar; such as, a plebeian joke.