nullify
v. C1 Advanced US //ˈnəɫəˌfaɪ// UK //nˈʌlɪfˌaɪ// nul·li·fy
v. to make something invalid or to cancel its effect. You use this when a law or a contract is no longer useful or legal.
v. to make something ineffective, invalid, or legally void. Often describes the process of rendering a legal document or a contract unenforceable.
The new law will nullify the old one.
The judge ruled that the evidence was so biased that it would nullify the entire trial.
The constitutional amendment was designed to nullify the previous executive order, effectively restoring the original legal framework that had been suspended during the emergency.
From null + -ify.