Source : Webster's Revised Unabridged Dictionary (1913)

Avidity \A*vid"i*ty\, n. [L. aviditas, fr. avidus: cf. F.
   avidit['e]. See {Avid}.]
   Greediness; strong appetite; eagerness; intenseness of
   desire; as, to eat with avidity.

         His books were received and read with avidity.
                                                  --Milward.

Source : WordNet®

avidity
     n : a positive feeling of wanting to push ahead with something
         [syn: {eagerness}, {avidness}, {keenness}]