Nullification (noun)

1. The act of declaring something null and void, or invalid.
2. The act of cancelling or annulling something, especially a law or legal agreement.

Origin:

Late latin nullificātiō, from latin nullus "not any" + -ficātiō, a suffix indicating a making or doing, formed in the 16th century.

Examples:

1. The nullification of the treaty led to a diplomatic crisis.
2. The nullification of the election was widely criticized as undemocratic.
3. The nullification of the contract was a last resort.
4. The nullification of the law was unconstitutional.
5. The nullification of the verdict was a rare event in the legal system.