An assertion of the contrary to what has been said or affirmed; denial; contrary declaration.

Opposition, whether by words, reproaches or attempts to defeat. Consider him that endured such contradiction of sinners against himself. Hebrews 12:3.

Direct opposition or repugnancy; inconsistency with itself; incongruity or contrariety of things, words, thoughts or propositions. These theorems involve a contradiction. If we perceive truth, we thereby perceive whatever is false in contradiction to it.