viva (interj.)

1640s, from Italian viva "(long) live, may he (or she) live," third person singular present subjunctive of vivere "to live," from Latin vivere "to live," from PIE root *gwei- "to live." Probably reborrowed (1836) from Spanish viva, from vivir "to live," from Latin vivere. Sometimes also in Latin form vivat (1660s).

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Definitions of viva from WordNet

viva (n.)
an examination conducted by spoken communication;
Synonyms: oral / oral exam / oral examination / viva voce