disaffirmation

from WordNet (r) 3.0 (2006)

disaffirmation
    n 1: the act of asserting that something alleged is not true
         [syn: {denial}, {disaffirmation}]

from The Collaborative International Dictionary of English v.0.48

Disaffirmation \Dis*af`fir*ma"tion\, n.
   The act of disaffirming; negation; refutation.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

29 Moby Thesaurus words for "disaffirmation":
      abjuration, abjurement, abrogation, absolute contradiction,
      annulment, contradiction, contrary assertion, contravention,
      controversion, countering, crossing, denial, disallowance,
      disavowal, disclaimer, disclamation, disownment, disproof,
      forswearing, gainsaying, impugnment, nullification, recantation,
      refutation, renunciation, repudiation, retractation, retraction,
      revocation