From The Collaborative International Dictionary of English v.0.48:
Vulgarity \Vul*gar"i*ty\, n. [Cf. F. vulgarit['e], L. vulgaritas the multitude.] [1913 Webster] 1. The quality or state of being vulgar; mean condition of life; the state of the lower classes of society. --Sir T. Browne. [1913 Webster]
2. Grossness or clownishness of manners of language; absence of refinement; coarseness. [1913 Webster]
The reprobate vulgarity of the frequenters of Bartholomew Fair. --B. Jonson. [1913 Webster]