Veto
The procedure established under the Constitution by which the President refuses to approve a bill or joint resolution and thus prevents its enactment into law. A regular veto occurs when the President returns the legislation to the house in which it originated. The President usually returns a vetoed bill with a message indicating his reasons for rejecting the measure. The veto can be overridden only by a two-thirds vote in both the Senate and the [[United_States_House_of_Representatives|House].[1]
Veto Override
The process by which each chamber of Congress votes on a bill vetoed by the President. To pass a bill over the President's objections requires a two-thirds vote in each Chamber. Historically, Congress has overridden fewer than ten percent of all presidential vetoes.[2]
Item Veto
Authority to veto part rather than all of an appropriations act. The President does not now have item-veto authority. He must sign or veto the entire appropriations act. The item veto sometimes is referred to as a line-item veto.[3]