ple·be·ian 
(plĭ-bēən)
(plĭ-bēən)adj.
1. Of or relating to the common people of ancient Rome: a plebeian magistrate.
2. Of, belonging to, or characteristic of commoners.
3. Unrefined or coarse in nature or manner; common or vulgar: plebeian tastes.
n.
1. One of the common people of ancient Rome.
2. A member of the lower classes.
3. A vulgar or coarse person.
[From Latin plēbius, from plēbs, plēb-, the common people; see pelə-1 in the Appendix of Indo-European roots.]
ple·beian·ism n.
ple·beian·ly adv.