vi·va vo·ce 
(vī′və vōsē, vēvə)
(vī′və vōsē, vēvə)adv. & adj.
By word of mouth: a report submitted viva voce; a viva voce examination.
[Medieval Latin vīvā vōce, with the living voice : Latin vīvā, feminine ablative sing. of vīvus, living + Latin vōce, ablative of vōx, voice.]