Disunion describes what happens when a club disbands or a marriage breaks up. The disunion of your book group means all the members have gone their separate ways.

The noun disunion means the coming apart of some connection or alliance, and because it's such a formal word it's often used to talk about governments or business federations. You could say that the disunion of Britain and India resulted in Partition, or that the US Civil War nearly ended in disunion. The word combines dis, "lack or not," and union, with its Latin root of unionem, "oneness or unity."

Definitions of disunion
  1. noun
    the termination or destruction of union
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    conjugation, jointure, unification, union, uniting
    the act of making or becoming a single unit
    detribalisation, detribalization
    the decline or termination of tribal organization
    type of:
    the act of dividing or disconnecting
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