Lewis & Short

dĕcŭrĭālis, e, adj. [decuria], of or belonging to a decuria: leges, Cod. Just. 11, 13, 2; hence subst., a member of a decuria (mostly post-class.): numerus, Tert. Anim. 37: DECVRIALIVM GERVLORVM DISPENSATOR, Inscr. Orell. 874; 976; 2252; 3216 al.; Fragm. Vat. § 142.