The Collaborative International Dictionary of English v.0.48:

Pomposity \Pom*pos"i*ty\, n.; pl. Pomposities.
   The quality or state of being pompous; pompousness.
   --Thackeray.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pomposity
    n 1: lack of elegance as a consequence of being pompous and
         puffed up with vanity [syn: ostentation,
         ostentatiousness, pomposity, pompousness,
         pretentiousness, puffiness, splashiness, inflation]