Lewis & Short

dĕcŭrĭōnātus, ūs, m. [2. decurio], the office and dignity of a decurion; of cavalry, Cato ap. Fest. p. 201, 28 M.; in the municipia, Traj. ap. Plin. Ep. 10, 114; Dig. 50, 2, 2 sq.; Inscr. Orell. 164 al.