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conciliabule

noun
con·​cil·​i·​a·​bule | \-lēəˌbyül\
plural -s

Definition of conciliabule 

: a clandestine meeting especially of conspirators or rebels against constituted authority in church or state

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History and Etymology for conciliabule

French, from Middle French, from Late Latin conciliabulum, from Latin, place of assembly, from concilium assembly, council

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