A type of Upapātagati;
The motion of the Siddha (liberated soul) and the Paramāṇu (the ultimate atom) which takes place in one Samaya (smallest time-unit).
nobhavaḥ-bhavavyatiriktaḥ karmasamparkasampādyanairayikatvādiparyāyarahita iti bhāvaḥ, sa ca pudgalaḥ siddho vā.
(Prajñā 16.33 Vṛ Pa 328)
ṇobhavovavāyagatī duvihā paṇṇattā, taṃ jahā-poggalaṇobhavovavāyagatī ya siddhaṇobhavovavāyagatī ya...
(Prajñā 16.33)