A word which has the opposite meaning of another word.
A word that describes one end of a scale, while its opposite describes the other end, such as large versus small; a gradable antonym.
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.
A logical inconsistency among two or more elements or propositions.
The act of contradicting.
A proposition that is false for all values of its propositional variables or Boolean atoms.