Lewis Short
antĕrĭor, ōris
* Adj. comp. [ante] (only in late Lat.), that is before, foremost: pars. Amm. 16, 8; 25, 3.—Of time, previous, former, anterior: litterae tuae,Symm. Ep. 6, 59: reges,Sulp. Sev. Hist. Sacr. 1, 52 al.— * Adv.: antĕrĭus, before, Sid. Ep. 2, 9.
Charlton T. Lewis, Charles Short, A Latin Dictionary