That phenomenon, according to which, a living being, after dying in a particular Kāya, i.e., one of the Ṣaḍjīvanikāya (six classes of living beings), gets reincarnated in the same Kāya (class of Jīva possessed of the same kind of body-material) or in the alien Kāya and again after death from there to get reincarnated in the same kind of Kāya.
uppalajīve pudhavijīve, punaravi uppalajive tti. kāyasamveho tti vivaksitakāyāt kāyāntare tulyakāye vāgatvāpunarapi yathāsambhavam tatraivāgamanam.
(Bha 11.30 Vṛ)