1. (n.) Opposition of one law or rule to another law or rule.

2. (n.) An opposing law or rule of any kind.

3. (n.) A contradiction or incompatibility of thought or language; -- in the Kantian philosophy, such a contradiction as arises from the attempt to apply to the ideas of the reason, relations or attributes which are appropriate only to the facts or the concepts of experience.

ambiguity ambivalence asymmetry disproportion disproportionateness equivocality equivocation heresy heterodoxy heterogeneity incoherence incommensurability incompatibility incongruity inconsistency inconsonance irony irreconcilability nonconformability nonconformity oxymoron paradox self-contradiction unconformability unconformity unorthodoxy