1 (in international law) The power given to any permanent member of the Security Council of the United Nations to refuse to agree to any nonprocedural proposal (there is no such power in relation to procedural matters) and thereby defeat it. An abstention is not equivalent to a veto. The President of the Security Council has power to determine which questions are nonprocedural. The General Assembly of the UN passed a Uniting for Peace Resolution in 1950, providing for the Assembly to take over some of the functions of the Security Council when the Council's work has been paralysed by use of the veto. This resolution, however, was only a political gesture and failed to overcome the veto power.
2 (in EU law)a. The power of a member state in the Council of the European Union to block legislation when a unanimous decision in favour of a measure is required. Although much EU legislation only requires a qualified majority decision of the Council, unanimity votes are required in such areas as taxation, budgets, foreign policy, and the admission of new member states. b. The power of the European Parliament to reject legislation proposed by the Commission by means of the codecision procedure.