S / subsistentia
noun

subsistentia

gen. subsistentiae · gender feminine · decl. 1st
subsisto, = ὑπὀστασις
the substance; reality
the substance, reality, Cassiod. Hist. Eccl. 5, 38; 9, 3; 12, 4 fin.; Boëth. Duab. Nat. p. 950.