Source : Webster's Revised Unabridged Dictionary (1913)

Disfranchisement \Dis*fran"chise*ment\, n.
   The act of disfranchising, or the state disfranchised;
   deprivation of privileges of citizenship or of chartered
   immunities.

         Sentenced first to dismission from the court, and then
         to disfranchisement and expulsion from the colony.
                                                  --Palfrey.

Source : WordNet®

disfranchisement
     n : the discontinuation of a franchise; especially the
         discontinuation of the right to vote