The Collaborative International Dictionary of English v.0.48:

Dixieland \Dixieland\ n.
   the 11 southern states that seceded from the U. S. in 1861.

   Syn: Confederacy, Confederate States of America, South,
        Dixie.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Dixieland
    n 1: the southern states that seceded from the United States in
         1861 [syn: Confederacy, Confederate States,
         Confederate States of America, South, Dixie,
         Dixieland]