Noun | 1. | subpoena ad testificandum - a writ issued by court authority to compel the attendance of a witness at a judicial proceeding; disobedience may be punishable as a contempt of court judicial writ, writ - (law) a legal document issued by a court or judicial officer law, jurisprudence - the collection of rules imposed by authority; "civilization presupposes respect for the law"; "the great problem for jurisprudence to allow freedom while enforcing order" |