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Definition of veto : 1. A document or message communicating the reasons of the executive for not officially approving a proposed law; - called also veto message.
2. A power or right possessed by one department of government to forbid or prohibit the carrying out of projects attempted by another department; especially, in a constitutional government, a power vested in the chief executive to prevent the enactment of measures passed by the legislature. Such a power may be absolute, as in the case of the Tribunes of the People in ancient Rome, or limited, as in the case of the President of the United States. Called also the veto power.
3. An authoritative prohibition or negative; a forbidding; an interdiction.
4. The exercise of such authority; an act of prohibition or prevention; as, a veto is probable if the bill passes.
5. To prohibit; to negative; also, to refuse assent to, as a legislative bill, and thus prevent its enactment; as, to veto an appropriation bill.

Synonyms:

nix, accept, ostracise, banish, not brook something, turn thumbs down on, ban, monopoly, domination, refuse, disallow, challenge, forestall, might, shun, push aside, close your mind to something, spurn, power, forbid, blackball, shoot down, authority, silence, leadership, dismissal, deceive yourself, bar, turn down, clamp down, control, embargo, prevent, ignore, not hear of it, proscribe, put your foot down, prohibit, ostracize, foreclose, proscription, preclude, cast out, negative, interdict, decline, oligopoly, force, greatness, resistance

delete, efface, divorce, eradicate, dismiss, refute, disavow, extinguish, eliminate, neutralize, repudiate, disaffirm, undo, obliterate, abnegate, negate, deny, withdraw, nullify, destroy, cancel, abolish, reject, retract, invalidate, revoke, disclaim, annul, dissolve

declination, interdiction

refutation, prohibition, rejection, repudiation, disavowal, refusal, denial, contradiction

Usage examples:

• For the President to give way before such constraint would be to lose the veto power and to destroy the independence of the executive as a branch of the government. - "The United States Since The Civil War", Charles Ramsdell Lingley.
• Andrew Johnson The bill was promptly passed in both Houses over the President's veto and became a law. - "History-of-the-Impeachment-of-Andrew-Johnson-President-of-the-United-States-by-the-House-of-Representatives-and-his-trial-by-the-Senate-for-high-crimes-and-misdemeanors-in-office-1868", Ross, Edmund G. (Edmund Gibson).
• The idea implies a right of veto which is repugnant to me. - "The Morals of Marcus Ordeyne", William J. Locke.