As is often the case, while searching for something else I ran across an insightful article on extradition from ThoughtCo. Since this is a topic I’ve researched in the past, I’m offering below some of the essential Spanish terms and concepts concerning extradition (in general, and between EU countries) with possible English translations.

• tratado de extradición–extradition treaty
• Convenio relativo a la extradición entre los Estados miembros de la Unión Europea–Convention relating to Extradition between the Member States of the European Union
• petición de extradición–extradition request
• Decisión marco relativa a la orden de detención europea—Framework Decision on the European Arrest Warrant
• orden europea de detención y entrega (“euroorden”)—European arrest warrant (EAW)
• sujeto/personas extraditables–extraditable persons
• sujetos extraditados; personas extraditadas–extradited persons
• estado requirente–requesting state
• estado requerido–requested/extraditing/surrendering state
• extradición activa–request for extradition; import extradition (E&W); seeking the extradition of an alleged offender from another jurisdiction
• extradición pasiva–receipt of an extradition request; export extradition (E&W); extradition of an alleged offender to another jurisdiction
• extradición en tránsito–transit extradition
• extradición legal–extradition governed by domestic law
• extradición convencional–extradition governed by international treaty
• reextradición–reextradition
• principio de legalidad–legality principle (requirement that there be a treaty or law that allows extradition)
• principio de reciprocidad–reciprocity principle
• principio de la doble incriminación–dual criminality principle; rule of dual criminality (principle that allows a state to refuse to extradite if the alleged crime on which extradition is based does not constitute an offense in both the requesting and extraditing states)
• principio de especialidad–speciality principle; rule of speciality (principle that a person who has been extradited may only be prosecuted for the offense alleged in the extradition request)
• principio de la no entrega por delitos de carácter político y militar–principle of refusing to extradite for political or military offenses
• principio de la no entrega por delitos no perseguibles de oficio–principle of refusing to extradite for private crimes for which there is no mandatory prosecution in the extraditing state
• principio de la no entrega por delitos leves–principle of refusing to extradite for misdemeanors
• principio de non/ne bis in idem–rule against double jeopardy
• principio de no entrega de los nacionales–principle of refusing to extradite one’s own citizens for trial in a foreign country