The Collaborative International Dictionary of English v.0.48:

Disfranchisement \Dis*fran"chise*ment\, n.
   The act of disfranchising, or the state of being
   disfranchised; deprivation of privileges of citizenship or of
   chartered immunities.
   [1913 Webster]

         Sentenced first to dismission from the court, and then
         to disfranchisement and expulsion from the colony.
                                                  --Palfrey.
   [1913 Webster]

WordNet (r) 3.0 (2006):

disfranchisement
    n 1: the discontinuation of a franchise; especially the
         discontinuation of the right to vote