To hinder or prevent.
To exclude or shut out; to bar.
To prohibit (a person or company that has been convicted of criminal acts in connection with a government program) from future participation in that program.
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.