Lewis Short
(verb) : praeostendo, endi, ensum, 3
* To show beforehand, display before, make clear (late. Lat.): hoc monstrare debent, hoc ostendere vel praeostendere, Aug. Civ. Dei, 21, 8, 6.—Absol.: portenta a portendendo, id est, praeostendendo, Aug. Civ. Dei, 21, 8, 6; cf. Isid. 11, 3, 3.—Hence, praeosten-sus, a, um, Part., foreshown (eccl. Lat.): sabbatum praeostensum et praedictum,Tert. adv. Jud. 4: sacrificia,id. ib. 5.
Charlton T. Lewis, Charles Short, A Latin Dictionary