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misjoinder

American  
[mis-join-der] / mɪsˈdʒɔɪn dər /

noun

Law.
  1. a joining in one suit or action of causes or of parties not permitted to be so joined.


misjoinder British  
/ mɪsˈdʒɔɪndə /

noun

  1. law the improper joining of parties as coplaintiffs or codefendants or of different causes of action in one suit Compare nonjoinder

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of misjoinder

First recorded in 1850–55; mis- 1 + joinder