Definition of pandemonium noun from the Oxford Advanced Learner's Dictionary

 

pandemonium

 noun
noun
BrE BrE//ˌpændəˈməʊniəm//
 
; NAmE NAmE//ˌpændəˈmoʊniəm//
 
[uncountable]
 
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a situation in which there is a lot of noise, activity and confusion, especially because people are feeling angry or frightened synonym chaos Pandemonium broke out when the news was announced. There was pandemonium in the classroom till the head appeared. Word Origin mid 17th cent.: modern Latin (denoting the place of all demons, in the English poet Milton's Paradise Lost), from pan- ‘all’ + Greek daimōn ‘demon’.Extra examples The children got lost amid the pandemonium. There was complete pandemonium when the tent collapsed. It was absolute pandemonium in there.
See the Oxford Advanced American Dictionary entry: pandemonium