plebeian \plih-BEE-uhn\ (adjective) - 1 : Of or pertaining to the Roman plebs, or common people. 2 : Of or pertaining to the common people. 3 : Vulgar; common; crude or coarse in nature or manner.
(noun) - 1 : One of the plebs, or common people of ancient Rome; opposed to patrician. 2 : One of the common people or lower classes. 3 : A coarse, crude, or vulgar person.
"A merciless patrician had despoiled a plebeian virgin, beaten and humiliated her outraged plebeian suitor, and driven her distraught plebeian father to an act of uttermost shame and desperation." -- Steven Saylor, 'Roma'
Plebeian is from Latin plebeius, from plebs, plebis, "the common people."