The Collaborative International Dictionary of English v.0.48:

Opulence \Op"u*lence\, n. [L. opulentia: cf. F. opulence. See
   Opulent.]
   Wealth; riches; affluence. --Swift
   [1913 Webster]

WordNet (r) 3.0 (2006):

opulence
    n 1: wealth as evidenced by sumptuous living [syn: luxury,
         luxuriousness, opulence, sumptuousness]