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]

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "disavowal":
   abjuration, abjurement, abrogation, absolute contradiction,
   annulment, contradiction, contrary assertion, contravention,
   controversion, countering, crossing, denial, disaffirmation,
   disallowance, disclaimer, disclamation, disowning, disownment,
   disproof, expatriation, forswearing, gainsaying, impugnment,
   nullification, palinode, palinody, recantation, refutation,
   reneging, renouncement, renunciation, repudiation, retractation,
   retraction, revocation, revokement, unsaying, withdrawal