M / mĕlĭōrātĭo
noun

mĕlĭōrātĭo

gen. mĕlĭōrātōnis · gender feminine · decl. 3rd
a bettering, improvement, melioration
a bettering, improvement, melioration (post-class.), Cod. Just. 4, 66, 2; 2, 19, 24.