The Collaborative International Dictionary of English v.0.48:

Disavowal \Dis`a*vow"al\, n.
   The act of disavowing, disclaiming, or disowning; rejection
   and denial.
   [1913 Webster]

         An earnest disavowal of fear often proceeds from fear.
                                                  --Richardson.
   [1913 Webster]

WordNet (r) 3.0 (2006):

disavowal
    n 1: denial of any connection with or knowledge of [syn:
         disavowal, disclaimer]