veto

A political right to disapprove of (and thereby stop) the process of a decision, a law etc.

• The people’s veto is a constitutional provision[…]that allows the citizens of Maine, through the initiative and referendum process, to repeal a piece of legislation passed by the legislature.

An invocation of that right.

• Now, Republican legislators cannot afford to lose a single seat, in either chamber, if they want to continue to override his vetoes.

An authoritative prohibition or negative; a forbidding; an interdiction.

• This contemptuous veto of her husband's on any intimacy with her family.

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.

To use a veto against.transitive

• The president vetoed the bill.

To countermand.transitive

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