verb (used with object), nul·li·fied, nul·li·fy·ing. to render or declare legally void or inoperative: to nullify a contract.

What is nullified?

nullify implies counteracting completely the force, effectiveness, or value of something. a penalty nullified the touchdown negate implies the destruction or canceling out of each of two things by the other.

What is the noun of nullify?

Nullification is the act of cancelling something. ... Use the noun nullification when one thing overcomes or overrides another, basically erasing the effects of the first thing.