Source : Webster's Revised Unabridged Dictionary (1913)

Anonymity \An`o*nym"i*ty\, n.
   The quality or state of being anonymous; anonymousness; also,
   that which anonymous. [R.]

         He rigorously insisted upon the rights of anonymity.
                                                  --Carlyle.

Source : WordNet®

anonymity
     n : the state of being anonymous [syn: {namelessness}]