letter of advocation.Hist. Scots law. A warrant, issued by the Court of Session, discharging an inferior court from further proceedings in a matter and transferring the action to the issuing superior court. • In a criminal case, the High Court of Justiciary could issue a letter to call up a case for review from an inferior court. The letter of advocation was abolished in 1868 and replaced by appeal.

[Blacks Law 8th]