Noun
(rare) restoration, renovation, reestablishment, particularly:
(especially religion, rare) An apocalypse leading to the remaking of the world rather than a Final Judgment, (Christianity) an Origenist doctrine condemned by the 543 C.E. Synod of Constantinople.
(religion) The doctrine that all souls will enter heaven or paradise, (Christianity) an Origenist doctrine condemned by the 543 C.E. Synod of Constantinople.
(medicine, rare) return to an earlier condition.
(astronomy) Return to the same apparent position, as after a revolution.
Source: en.wiktionary.orgTheological Studies. 54 (December 1993), p. 632. However, it is not clear or universally accepted that Gregory held to the doctrine of apocatastasis. Source: Internet
This view of Gregory is also held by some modern theologians, such as John Sachs who said that Gregory had "leanings" toward apocatastasis, but in a "cautious, undogmatic" way. Source: Internet