What term refers to setting aside or overruling a decision?

The term that refers to setting aside or overruling a decision is indeed “override.” This action typically occurs in a legislative context, where one body can reject a previous decision made by another body, such as overriding a presidential veto. The concept of overriding is crucial in ensuring checks and balances within a government, allowing a legislative body to maintain its authority over an executive decision when it believes the decision is not in the best interest of governance.

In contrast, “veto” specifically refers to the power of one branch of government to reject or prohibit a decision made by another branch. “Modify” generally means to alter or change something but does not inherently imply the authority to nullify it. “Ratify” means to formally approve or confirm a decision rather than to set it aside, often used in the context of treaties or constitutional amendments. Thus, the term "override" correctly encapsulates the process of overriding a previously made decision.