Acclamation (Papal elections)wikipedia
Acclamation was formerly one of the methods of papal election.
acclamationelection by acclamationquasi-inspirationone of the few popes elected by acclamationby acclamationAcclamation in papal electionsacclaimed him popeacclaimed pope

Papal conclave

conclavepapal conclaveconclaves
Acclamation was formerly one of the methods of papal election.
Aeterni Patris Filius did not eliminate the possibility of election by acclamation, but did require that a secret ballot take place first before a pope could be elected.

Pope

popepapacypapal
The method of electing the Roman Pontiff is contained in the constitutions of Gregory XV Æterni Patris Filius and Decet Romanum Pontificem, Urban VIII's constitution Ad Romani Pontificis Providentiam, and John Paul II's Universi Dominici gregis, issued in 1996.
Traditionally, the vote was conducted by Acclamation, by selection (by committee), or by plenary vote.

Pope Gregory VII

Gregory VIIHildebrandPope Gregory VII
Pope Gregory VII was one of the few popes elected by acclamation.

Pope Fabian

FabianSaint FabianFabianus
The congregation took this as a sign that he was marked out for this dignity, and Fabian was at once proclaimed bishop by acclamation.

Universi Dominici gregis

The method of electing the Roman Pontiff is contained in the constitutions of Gregory XV Æterni Patris Filius and Decet Romanum Pontificem, Urban VIII's constitution Ad Romani Pontificis Providentiam, and John Paul II's Universi Dominici gregis, issued in 1996.
Alternatively, formal ballots could be discarded: in election by acclamation (per acclamationem seu inspirationem) the electors simultaneously shouted out the name of their preferred candidate.

Aeterni Patris Filius

Æterni Patris Filius
The method of electing the Roman Pontiff is contained in the constitutions of Gregory XV Æterni Patris Filius and Decet Romanum Pontificem, Urban VIII's constitution Ad Romani Pontificis Providentiam, and John Paul II's Universi Dominici gregis, issued in 1996.
Gregory sought wide input from the reforms, and heard arguments from Robert Bellarmine and Federico Borromeo, who advocated for an end to election by acclamation because it made it impossible to determine how many votes were cast and prevented secrecy in the elections.

Pope Gregory XV

Gregory XVPope Gregory XVAlessandro Ludovisi
The method of electing the Roman Pontiff is contained in the constitutions of Gregory XV Æterni Patris Filius and Decet Romanum Pontificem, Urban VIII's constitution Ad Romani Pontificis Providentiam, and John Paul II's Universi Dominici gregis, issued in 1996.
As an example, his papal bull of 15 November 1621, Aeterni Patris Filius, regulated papal elections, which henceforth were to be by secret ballot; three methods of election were allowed: by scrutiny, compromise and quasi-inspiration.

Angels & Demons

novel of the same namenovelAngels and Demons
In the 2000 book Angels & Demons, Camerlengo Carlo Ventresca is elected by acclamation.
It is revealed that the cardinals' endorsing of him would have made him Pope by acclamation.

Acclamation

acclamationacclaimedby acclamation
This form of election is most commonly associated with papal elections (see Acclamation in papal elections), though this method was discontinued by Pope John Paul II's apostolic constitution Universi Dominici gregis.

Pope Joan (2009 film)

Pope Joanthe filmPope Joan'' (2009 film)
Meanwhile, Lothair's ally Anastasius successfully plots to murder Sergius in order to became pope himself, but the people elect Johanna as his successor by acclamation.

Quia propter

It recognized three processes for unanimous agreement: "acclamation", "scrutiny" (balloting), and "compromissum" (compromise committee).

Domenico Toschi

Toschi was a candidate for the papacy in the May 1605 papal conclave, and was almost acclaimed pope, but Caesar Baronius intervened, objecting that Toschi was unfit for the papacy because his language and dress would cause scandal.

Pietro Campori

Borghese wanted to have Campori elected by acclamation on the first night of the conclave, but the ambassador of Louis XIII of France had a letter excluding Campori from election to the papacy, and waited for cardinals opposed to Campori to arrive before leaving so as to not have to formally exclude him.

Papal conclave, 1655

papal conclave of 1655conclave of 16551655
On the first scrutiny on 7 April 1655, 20 written ballots were cast for Chigi, before the other electors acclaimed him pope after a conclave lasting 80 days.

Papal conclave, April 1555

papal conclave of April 1555April 1555April
On April 9 at 11 p.m. they elected by acclamation Cardinal Marcello Cervini.

Pope Urban VIII

Urban VIIIpope Urban VIIIMaffeo Barberini
The method of electing the Roman Pontiff is contained in the constitutions of Gregory XV Æterni Patris Filius and Decet Romanum Pontificem, Urban VIII's constitution Ad Romani Pontificis Providentiam, and John Paul II's Universi Dominici gregis, issued in 1996.

Pope John Paul II

John Paul IIPope John Paul IIKarol Wojtyła
The method of electing the Roman Pontiff is contained in the constitutions of Gregory XV Æterni Patris Filius and Decet Romanum Pontificem, Urban VIII's constitution Ad Romani Pontificis Providentiam, and John Paul II's Universi Dominici gregis, issued in 1996.

Compromise

compromisesecurity compromisesModeratism
These were, namely, by scrutiny, by compromise, and by acclamation (or "quasi-inspiration").

Holy Spirit

SpiritHoly Ghostholy spirit
As this was required to be done without previous consultation or negotiation it was looked on as proceeding from the Holy Spirit and hence was also designated "quasi-inspiration".

Pope Benedict XVI

Pope Benedict XVIBenedict XVIJoseph Ratzinger
On June 11, 2007, Pope Benedict XVI issued a motu proprio which requires a two-thirds majority regardless of the number of ballots it takes to elect a new Pope.