Lewis Short
(adverb) : prŏpĕdĭem (also separate, prope diem), prope-dies
* At an early day, very soon, shortly (class.), Plaut. Pers. 2, 4, 24; 5, 2, 56: prognostica mea propediem exspecta,Cic. Att. 2, 1, 11: propediem te videbo,id. Div. 1, 23, 47; Sall. C. 56, 4: propediem,prematurely,Liv. 1, 48, 7.
Charlton T. Lewis, Charles Short, A Latin Dictionary