Meaning of “black mass” in the English Dictionary

british dictionary

"black mass" in British English

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black massnoun [ C usually singular ]

uk /ˌblæk ˈmæs/ us /ˌblæk ˈmæs/

Examples from literature

  • They will do silly things that will strike them as being indecent and blasphemous and dreadful—black masses and suchlike nonsense—and then they will get scared. 

(Definition of “black mass” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)