An expression granting permission; an indication of agreement with a proposal; an acknowledgement that a person, thing, or event meets requirements.
Something mailed by a seller to a collector to match their stated interests; the collector can approve of or return the item.
An expression of favorable acceptance and encouragement; a compliment that also condones.
The act of validating something.
Something, such as a certificate, that validates something; attestation, authentication, confirmation, proof or verification.
The process of identifying a new prisoner's gang affiliation.
The process whereby others confirm the validity of one's emotions.