Lewis & Short

postfactus, or separate, post fac-tus, a, um, Part., from the obsol. postfacio, made or done afterwards (post-class.): post facta furta (opp. ante facta), Gell. 17, 7, 3.
Absol.: ex postfacto, from what is done afterwards, afterwards, subsequently, Dig. 21, 1, 44 fin. (20, 1, 22).