"demimonde : (chiefly historical (19th-century France)) A class of women maintained by wealthy..."

“demimonde : (chiefly historical (19th-century France)) A class of women maintained by wealthy protectors; female courtesans or prostitutes as a group.
(by extension) A group having little respect or reputation.
(by extension) A member of such a class or group of persons.”

- https://en.wiktionary.org/wiki/demimonde#English

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