/ ˌpændəˈməʊniəm; NAmE -ˈmoʊ-/ noun
[ U ] a situation in which there is a lot of noise, activity and confusion, especially because people are feeling angry or frightened
SYN chaos :
Pandemonium broke out when the news was announced.
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WORD ORIGIN
mid 17th cent.: modern Latin (denoting the place of all demons, in Milton's Paradise Lost ), from pan- all + Greek daimōn demon.