Wikipedia
In Ancient Roman and Byzantine tradition, acclamatio ( Koiné aktologia) was the public expression of approbation or disapprobation, pleasure or displeasure, etc., by loud acclamations. On many occasions, there appear to have been certain forms of acclamations always used by the Romans; as, for instance, at marriages, , , or ; at triumphs, ; at the conclusion of plays the last actor called out to the spectators; orators were usually praised by such expressions as , , , etc.
Under the empire, the name of was given to the praises and flatteries which the senate bestowed upon the emperor and his family. These , which are frequently quoted by the Scriptores Historiae Augustae, were often of considerable length, and seems to have been chanted by the whole body of senators.
There were regular shouted by the people, of which one of the most common was . Other instances of are given by Franciscus Ferrarius (Francesco Bernardino Ferrari), in his , and in Graevius, vol. vi.