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n. Law
1. Failure to name as a party one that legally should have been named, as in a lawsuit.
2. Failure to include as part of a cause of action or suit a claim that legally should have been made.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Law) law the failure to join as party to a suit a person who should have been included either as a plaintiff or as a defendant. Compare misjoinder
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(nɒnˈdʒɔɪn dər)

n. Law.
failure to join a party to an action.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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(253) Additionally, with every litigated challenge, there is a risk that a patent will be invalidated, which may reduce the portfolio value, especially given the nonjoinder rules that give each defendant a defense in front of a different court.
Jurgelsky, Peralta Cortellesi and Galen-Med, Inc., filed motions to abate the suit due to the nonjoinder of Shirley Addison as co-administrator, asserting that "[a] single administrator of an estate that has two co-administrators has no right, standing, or authority to file an action at law without the other co-administrator joining in the case." The Circuit Court denied the motion to abate and granted Jerry leave to file an amended complaint joining Shirley as a plaintiff.
Procedurally, Ickes arose upon a motion by the Secretary to dismiss for nonjoinder of an indispensable party.
The factors to be considered by the court include: first, to what extent a judgment rendered in the person's absence might be prejudicial to the person or those already parties; second, the extent to which, by protective provisions in the judgment, by the shaping of relief, or other measures, the prejudice can be lessened or avoided; third, whether a judgment rendered in the person's absence will be adequate; fourth, whether the plaintiff will have an adequate remedy if the action is dismissed for nonjoinder.(111) Looking at the factors in order, first, the judgment would probably not be prejudicial to the CIA because if not joined the CIA will have to be brought to trial separately and will have its own host of special defenses as a sovereign.
This case predated the statute on nonjoinder of insurers but this result could still occur with nonjoinder, if the insurer pays and stops defending.
Ashraf may be reconciled with the same court's earlier decisions because the plaintiff had added the insurer as a party pursuant to the Florida nonjoinder statute.
Plumer,(305) we must ask whether any federal rule or statute governs.(306) In some cases involving the claim preclusive effect of nonjoinder of claims or parties, Federal Rules of Civil Procedure 13(a), 18, 19, and 20 arguably apply, just as Rule 41(b) informs the "on the merits" determination.
Third, as arbitration is a creature of contract,[11] nonjoinder clauses often preclude other parties such as design professionals, subcontractors, engineers, and sureties from participating in arbitration.