n. the joining together of several lawsuits or several parties all in one lawsuit, provided that the legal issues and the factual situation are the same for all plaintiffs and defendants. Joinder requires a) that one of the parties to one of the lawsuits make a motion to join the suits and the parties in a single case; b) notice must be made to all parties; c) there must be a hearing before a judge to show why joinder will not cause prejudice (hurt) to any of the parties to the existing lawsuits; and d) an order of the judge permitting joinder. 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. See also: mandatory joinder misjoinder multiplicity of suits