—n. 1. the power or right vested in one branch of a government to cancel or postpone the decisions, enactments, etc., of another branch, esp. the right of a president, governor, or other chief executive to reject bills passed by the legislature.
2. the exercise of this right.
3. Also called ve'to mes"sage. a document exercising such right and setting forth the reasons for such action.
4. a nonconcurring vote by which one of the five permanent members of the UN Security Council can overrule the actions or decisions of the meeting on matters other than procedural.
5. an emphatic prohibition of any sort.
6. See pocket veto.
—v.t. 1. to reject (a proposed bill or enactment) by exercising a veto.
2. to prohibit emphatically. Also called ve'to pow"er(for defs. 1, 4).