conclamatio

conclāmātĭo, ōnis, f. [conclamo],

a loud shouting or calling of many persons together, a shout (rare; not in Cic.): universi exercitūs, Caes. B. C. 2, 26: tot milium sub gladio gementium, Sen. Clem. 1, 12, 2; in plur., Tac. A. 3, 2; id. H. 4, 1.