Which term best describes a legal mechanism to move a defendant from one jurisdiction to another for trial?

The term that best describes a legal mechanism to move a defendant from one jurisdiction to another for trial is "extradition." Extradition is the formal process by which one jurisdiction (usually a country or a state) surrenders an individual to another jurisdiction where that individual is accused or convicted of a crime. This process usually involves a legal request and can be governed by treaties between jurisdictions, ensuring that the rights of the accused are respected during the transfer.

Habeas corpus, while a critical legal principle, primarily deals with the right of individuals to challenge unlawful detention in court rather than the transfer of a defendant between jurisdictions. Jurisprudence refers to the theory and philosophy of law, encompassing legal principles but not specifically related to the movement of defendants. A subpoena, on the other hand, is a legal document ordering someone to appear in court or produce evidence, which does not pertain to the process of transferring a defendant between jurisdictions. Thus, extradition is the most appropriate term in this context.