dŭŏ-dĕcĭmus, a, um,
ord. num. , the twelfth (a common word in Caes.): legio, Caes. B. G. 2, 23, 4; 2, 25, 1; 3, 1, 1; 7, 62, 4; id. B. C. 3, 34, 3.—Adv.: dŭŏdĕcĭmo , for the twelfth time : consul, Capitol. Anton. Pius, 1, § 8.
duodecimus adj.numord. duodecim, the twelfth : legio, Cs. ...
An Elementary Latin Dictionary