Source : Webster's Revised Unabridged Dictionary (1913)

Vulgarity \Vul*gar"i*ty\, n. [Cf. F. vulgarit['e], L. vulgaritas
   the multitude.]
   1. The quality or state of being vulgar; mean condition of
      life; the state of the lower classes of society. --Sir T.
      Browne.

   2. Grossness or clownishness of manners of language; absence
      of refinement; coarseness.

            The reprobate vulgarity of the frequenters of
            Bartholomew Fair.                     --B. Jonson.

Source : WordNet®

vulgarity
     n : the quality of lacking taste and refinement [syn: {coarseness},
          {commonness}, {grossness}, {vulgarism}, {raunch}]