Definition of "contradiction"

(countable, uncountable) The act of contradicting.  examples

(countable) A statement that contradicts itself, i.e., a statement that claims that the same thing is true and that it is false at the same time and in the same senses of the terms.  examples

(countable) A logical inconsistency among two or more elements or propositions.  examples

(logic, countable) A proposition that is false for all values of its propositional variables or Boolean atoms.  examples