To authenticate or verify in writing.
To attest that a product, service, organization, or person has met an official standard.
To attest to (a fact) as the truth.
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.