ousiosis

ousiosis [οὐσίωσις] , (phil. & theol.) subsistence, existence as substance or entity. licet ‥ usiosis Grece idem dicatur quod subsistentia Latine, non tamen dicimus tres personas esse tres usioses Neckam SS II 3. 4; Greci ‥ quatuor nomina posuerunt: usiam, usiosim, hypostasim, personam [cf. Boeth. Contra Eut. 1343D-45B] Hales Qu. 20.