undĕcĭmus: a, um, num. adj. unusdecimus,I the eleventh: legio, Liv. 30, 18, 10: annus, Verg. E. 8, 39: dies, Plin. 11, 54, 118, § 283.
ūndĕcĭmus,¹¹ a, um (undecim), onzième : Liv. 30, 18, 10.