资料来源 : Webster's Revised Unabridged Dictionary (1913)

Sumptuosity \Sump`tu*os"i*ty\, n. [L. sumptuositas: cf. F.
   somptuosit['e].]
   Expensiveness; costliness; sumptuousness. [R.] --Sir W.
   Raleigh.

资料来源 : WordNet®

sumptuosity
     n : the quality possessed by something that is excessively
         expensive [syn: {lavishness}, {luxury}, {sumptuousness}]