subpoena ad testificandum
| \ -ˌad-ˌtes-tə-fə-ˈkan-dəm, -ˌäd-ˌtes-tē-fē-ˈkän-ˌdu̇m \ | subpoena ad tes·ti·fi·can·dum
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: a subpoena that commands a witness to appear and give testimony