Nullity, want of force or efficacy; an error in litigation which is incurable, and thus differs from an irregularity, which is amendable.
A decree is said to be a nullity if it is passed by a court having no inherent jurisdiction. Merely because a Court erroneously passes a decree or there is an error while passing the decree, the decree cannot be called a nullity. The decree to be called a nullity is to be understood in the sense that it is ultra vires the powers of the Court passing the decree and not merely voidable decree, Hiralal Moolchand Doshi v. Barot Raman Lal Ranchhoddas, AIR 1993 SC 1449 (1452): (1993) 2 SCC 458.