Lewis Short
(verb) : prae-formo, āvi, ātum, 1
* To form or fashion beforehand, to instruct beforehand, to prepare, etc. (post-Aug.): his praeformat dictis,Sil. 7, 385; Tert. Apol. 1 fin.: velut praeformata materia,Quint. 2, 6, 5: praeformatae infantibus litterae,traced beforehand,id. 5, 14, 31.
Charlton T. Lewis, Charles Short, A Latin Dictionary