nonjoinder. 1. The failure to bring a person who is a necessary party into a lawsuit. Fed. R. Civ. P. 12(b)(7), 19. See JOINDER. Cf. MISJOINDER(1); DISJOINDER(1). [Cases: Federal Civil Procedure 384; Parties 77, 81. C.J.S. Parties §§ 197, 205.] 2.Patents. Failure to name a coinventor in a patent application.

[Blacks Law 8th]