The Collaborative International Dictionary of English v.0.48:

Self-contradiction \Self`-con`tra*dic"tion\, n.
   The act of contradicting one's self or itself; repugnancy in
   conceptions or in terms; a proposition consisting of two
   members, one of which contradicts the other; as, to be and
   not to be at the same time is a self-contradiction.
   [1913 Webster]

WordNet (r) 3.0 (2006):

self-contradiction
    n 1: contradicting yourself

Moby Thesaurus II by Grady Ward, 1.0:

72 Moby Thesaurus words for "self-contradiction":
   aberrancy, aberration, absurdity, ambiguity, ambivalence, antinomy,
   asymmetry, defectiveness, delusion, deviancy, disproportion,
   disproportionateness, distortion, equivocality, equivocation,
   errancy, erroneousness, error, fallaciousness, fallacy, falseness,
   falsity, fault, faultiness, flaw, flawedness, hamartia, heresy,
   heterodoxy, heterogeneity, hopelessness, illusion, impossibility,
   impossible, impossibleness, incoherence, incommensurability,
   incompatibility, inconceivability, incongruity, inconsistency,
   inconsonance, irony, irreconcilability, misapplication,
   misconstruction, misdoing, misfeasance, misinterpretation,
   misjudgment, no chance, nonconformability, nonconformity, oxymoron,
   paradox, peccancy, perversion, sin, sinfulness, the impossible,
   unconformability, unconformity, unimaginability, unorthodoxy,
   unthinkability, untrueness, untruth, untruthfulness,
   what cannot be, what cannot happen, wrong, wrongness