I / invertĭbĭlĭtas
noun

invertĭbĭlĭtas

gen. ātis · gender feminine · decl. 3rd
2. in-verto
unchangeableness
unchangeableness (eccl. Lat.): incommutabilitas, atque, ut ita dicam, invertibilitas, Aug. de Mor. Eccl. 13, 28.