Definition of "veto" in English

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.

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.

verb

1. (transitive) To use a veto against.

   • The president vetoed the bill.

2. (transitive) To countermand.

   • Mom and Dad vetoed our menu preferences for the holiday meal.