T / trīcennĭum
noun

trīcennĭum

gen. trīcennii · gender neuter · decl. 2nd
triginta-annos
the space of thirty years
the space of thirty years, Cod. Just. 7, 31, 1; Sid. Ep. 8, 6 med.; Cassiod. Var. 1, 18; 3, 31.