Source : Webster's Revised Unabridged Dictionary (1913)

Redundance \Re*dun"dance\ (r?*d?n"dans), Redundancy
\Re*dun"dan*cy\ (-dan*s?), n. [L. redundantia: cf. F.
   redondance.]
   1. The quality or state of being redundant; superfluity;
      superabundance; excess.

   2. That which is redundant or in excess; anything superfluous
      or superabundant.

            Labor . . . throws off redundacies.   --Addison.

   3. (Law) Surplusage inserted in a pleading which may be
      rejected by the court without impairing the validity of
      what remains.

Source : WordNet®

redundance
     n : the attribute of being superfluous and unneeded; "the use of
         industrial robots created redundancy among workers" [syn:
          {redundancy}]