Nolo's Plain-English Law Dictionary

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Joinder: The joining together of several lawsuits or several parties all in one lawsuit because the legal issues and the factual situation are the same for all plaintiffs and defendants, or because a party is necessary to the resolution of the case. Joinder may be mandatory if a person necessary to a fair result was not included in the original lawsuit, or it may be permissive if joining the cases together is only a matter of convenience or economy.