A more thorough explanation:

Term: NULLIFY
Definition:nullify, verb. To make void; to render invalid.
Example 1: The judge nullified the contract due to a breach of agreement.
Example 2: The new evidence presented in court nullified the previous verdict.

When something is nullified, it means that it is no longer valid or effective. In example 1, the judge declared the contract invalid because one of the parties did not fulfill their obligations. In example 2, the new evidence presented in court made the previous verdict invalid and a new decision had to be made. Nullifying something means to cancel it out or make it void.