Source : Webster's Revised Unabridged Dictionary (1913)

Viva \Vi"va\, interj. [It.]
   Lit., (long) live; -- an exclamation expressing good will,
   well wishing, etc. -- n. The word viva, or a shout or sound
   made in uttering it.

         A wilder burst of ``vivas''.             --R. H. Davis.

Source : WordNet®

viva
     n : an examination conducted by word of mouth [syn: {oral}, {oral
         exam}, {oral examination}, {viva voce}]