To disagree with something and reject or overturn it.
To declare something invalid or null and void.
To leave out of account; to omit or neglect.
To separate and reserve something for a specific purpose.
To use a veto against.
An invocation of that right.
A technique or mechanism for discarding what would otherwise constitute a false positive in a scientific experiment
A political right to disapprove of (and thereby stop) the process of a decision, a law etc.
An authoritative prohibition or negative; a forbidding; an interdiction.