The procedure established under the Constitution by which the President/Governor refuses to approve a bill or joint resolution and thus prevents its enactment into law. A regular veto occurs when the President/Governor returns the legislation to the house in which it originated. The President/Governor usually returns a vetoed bill with a message indicating his reasons for rejecting the measure. In Congress, the veto can be overridden only by a two-thirds vote in both the Senate and the House.