Nullification

Mason and I had an entirely civil debate about the merits of nullification versus an official "apology" for what had been done to Oppenheimer. I argued that an apology was not sufficient and that nullification was required precisely to restore the integrity of the security-review system.

Source: wiktionary

He infused the threat with credibility, and the nullification movement fizzled, though Jackson also helped craft a compromise reduction in tariff rates to somewhat mollify South Carolinians.

Source: wiktionary

Surgeons talk about procedures that result in bodies that don't exist in nature: those with both sets of genitals – the "phallus-preserving vaginoplasty"; double mastectomies that don't have nipples; "nullification" surgery, where there are no genitals at all, just smooth skin.

Source: wiktionary