quingentesimus
From LSJ
Latin > English (Lewis & Short)
quingentēsĭmus: a, um, adj. id.,
I the five hundredth (class.): annus, Cic. Fl. 1, 1; so Plin. 15, 1, 1, § 2.
Latin > French (Gaffiot 2016)
quīngentēsĭmus,¹⁴ a, um, cinq centième : Cic. Fl. 1.
Latin > German (Georges)
quīngentēsimus, a, um (quingenti), der fünfhundertste, annus, Cic. u. Plin.