An example of viva voce used as an adjective is in the phrase "viva voce story" which means a story that was told by mouth.
An example of viva voce used as an adverb is in the phrase "told viva voce" which means told by mouth and not by writing, music, etc.
A report submitted viva voce; a viva voce examination.
Origin of viva-voce
- Medieval Latin vīvā vōce with the living voice Latin vīvā feminine ablative sing. of vīvus living Latin vōce ablative of vōx voice
From American Heritage Dictionary of the English Language, 5th Edition
- From Latin vÄ«vā (“living") and vōce (“voice") (ablative of vōx).