A veto â Latin for "I forbid" â is the power to unilaterally stop an official action, especially the enactment of legislation. A veto can be absolute, as for instance in the United Nations Security Council, whose permanent members can block any resolution. Or it can be limited, as in the legislative process of the United States, where a two-thirds vote in both the House and Senate may override a Presidential veto of legislation. A veto only gives power to stop changes, not to adopt them . Thus a veto allows its holder to protect the status quo.