(Latin: ad-clamare, "to call out to")
Roman political phenomenon, much used during the imperial period. The people of Rome (or of any Roman city) could publicly signify their opinion on a particular decision or policy, by shouts of approval or disapproval. Acclamatio generally took place in the amphitheatre, and was normally intended for the emperor.
In later times, acclamatio has also been used to describe the practice of crowning kings "by acclaim", a traditional practice in the Germanic and Nordic kingdoms.