Rendition and extraordinary rendition are not terms defined by law. They describe the process by which a detainee is transferred from one state to another, outside normal legal processes (such as extradition or deportation). In many cases these detainees are transferred to secret detention or to a third country for the purposes of interrogation, often in circumstances where they face a real risk of torture.
About The APPG on Extraordinary Rendition
The APPG published its compendium "Account Rendered: Extraordinary Rendition and Britain’s Role” in 2011. The book contains a forensic analysis of the background to rendition, combined with a 200-page collection of primary documents, presented with commentary on their significance.