veto

Etymology

From Latin vetō (“I forbid”).

noun

1. A political right to disapprove of (and thereby stop) the process of a decision, a law etc.
2. An invocation of that right.
   I called Haig in and told him that I wanted to veto the agricultural appropriations bill we had discussed in the Cabinet meeting on Tuesday, because I did not want Ford to have to do it on his first day as President. Haig brought the veto statement in, and I signed it. It was the last piece of legislation I acted on as President. 1978, Richard Nixon, “The Presidency 1973-1974”, in RN: the Memoirs of Richard Nixon, Grosset & Dunlap, →LCCN, →OCLC, →OL, page 1078
3. An authoritative prohibition or negative; a forbidding; an interdiction.
4. A technique or mechanism for discarding what would otherwise constitute a false positive in a scientific experiment
   An outer detector (OD) region will act as both a passive shield for low energy backgrounds and an active veto for cosmic ray muons. 2021 J.R. Wilson and the Hyper-Kamiokande Collaboration 2021 J. Phys.: Conf. Ser. 2156 012153

verb

1. (transitive) To use a veto against.