In parliamentary usage, the act or method of voting orally and by groups rather than by ballot, esp. in elections;
the election of a pope or other ecclesiastic by unanimous consent of the electors, without a ballot.
a form of election not using a ballot
An acclamation is a form of election that does not use a ballot. The most frequent type of acclamation is a voice vote, in which the voting group is asked who favors and who opposes the proposed candidate. In the event of a lack of opposition, the candidate is considered elected.
Acclamation was formerly one of the methods of papal election.