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- plural form of folly
- (uncountable) A lavishly-produced theatrical revue characterized by major stars, huge casts, and opulent costumes and scenery.
- The most famous Broadway theatrical revues of all time were the Ziegfeld Follies.
- The theatrical sense is probably influenced by the French usage, as with the Folies Bergères in Paris.
- The word is not really used any more, but the big Las Vegas shows meet the definition for follies.