Source : Webster's Revised Unabridged Dictionary (1913)

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.

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

Source : WordNet®

preciosity
     n : the quality of being fastidious or excessively refined