The Collaborative International Dictionary of English v.0.48:

Preciosity \Pre`ci*os"i*ty\, n.
   Preciousness; something precious. [Obs.] --Sir T. Browne.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Preciosity \Pre`ci*os"i*ty\, n.; pl. -ties. [F.
   pr['e]ciosit['e], OF. also precieuset['e].]
   Fastidious refinement, esp. in language; specif., the
   affected purism and sententiousness characteristic of the
   French pr['e]cieuses of the 17th century.

         He had the fastidiousness, the preciosity, the love of
         archaisms, of your true decadent.        --L. Douglas.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

preciosity
    n 1: the quality of being fastidious or excessively refined
         [syn: preciosity, preciousness]