omission to join, as of a person who should have been a party to an action.
the failure to join as party to a suit a person who should have been included either as a plaintiff or as a defendant
Collins English Dictionary - Complete & Unabridged 10th Edition
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Hence there is no ground for dismissal of this proceeding due to nonjoinder of a necessary party.
Thus, it is not surprising that cases can be found that speak of nonjoinder as ousting the court of jurisdiction.