Lewis & Short

consistōrĭānus, a, um, adj. [consistorium, II. B.], of or pertaining to the emperor’s cabinet: comitiva, Cod. 10, 30, 3.
Freq. comes, or subst.: consistōrĭānus, i, m., an assessor, aid in council, Amm. 15, 5, 12; 31, 12, 10; Cod. Just. 12, 10.