S / sempĭternĭtas
noun

sempĭternĭtas

gen. ātis · gender feminine · decl. 3rd
sempiternus
perpetuity; eternal duration; eternity
perpetuity, eternal duration, eternity (postclass.): stabilis mundi, App. Trism. p. 94, 30; Claud. Mam. Stat. An. 1, 3; 2, 1.