The Collaborative International Dictionary of English v.0.48:

Viva voce \Vi"va vo"ce\ (v[imac]"v[.a] v[=o]"s[-e]). [L.]
   By word of mouth; orally.
   [1913 Webster]

WordNet (r) 3.0 (2006):

viva voce
    adv 1: orally; "I heard it viva voce" [syn: by word of mouth,
           viva voce]
    n 1: an examination conducted by spoken communication [syn:
         oral, oral exam, oral examination, viva voce,
         viva]

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "viva voce":
   articulate, articulated, enunciated, lingual, linguistic,
   nuncupative, oral, orally, parol, pronounced, said, sonant,
   sounded, speech, spoken, unwritten, uttered, verbal, verbally,
   vocal, vocalized, vocally, voiced, voiceful



Bouvier's Law Dictionary, Revised 6th Ed (1856):

VIVA VOCE. Living voice; verbally. It is said a witness delivers his
evidence viva voce, when he does so in open court; the term is opposed to
deposition. It is sometimes opposed to ballot; as, the people vote by
ballot, but their representatives in the legislature, vote viva voce.