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]

Moby Thesaurus II by Grady Ward, 1.0:

102 Moby Thesaurus words for "pomposity":
   Barnumism, affectation, arrogance, assurance, assuredness,
   bedizenment, belief, big talk, buckram, ceremonial,
   ceremoniousness, ceremony, certitude, cocksureness, confidence,
   confidentness, conviction, convolution, courage, dignity,
   extrinsicality, faith, flashiness, flatulence, flatulency, form,
   formality, formalization, fulsomeness, garishness, gaudiness,
   grandiloquence, grandioseness, grandiosity, gravity,
   high-flown diction, hubris, impersonality, inflatedness, inflation,
   lexiphanicism, loftiness, luridness, magniloquence, mere rhetoric,
   meretriciousness, orotundity, ostentation, ostentatious complexity,
   overconfidence, oversureness, overweening, overweeningness,
   platitudinous ponderosity, poise, polysyllabic profundity, pomp,
   pompous prolixity, pompousness, pontificality, pontification,
   positiveness, pretension, pretentiousness, pride, primness,
   prose run mad, rhetoric, rhetoricalness, rigidness, ritual,
   rituality, security, self-assurance, self-confidence,
   self-importance, self-reliance, sensationalism, sententiousness,
   settled belief, showiness, solemnity, starchiness, stiffness,
   stiltedness, stuffiness, stylization, subjective certainty,
   sureness, surety, swelling utterance, swollen phrase, swollenness,
   tall talk, tortuosity, tortuousness, trust, tumidity, tumidness,
   turgescence, turgidity, weight