Wiktionary
prognosticatory
a. That prognosticates or makes predictions about the future; predictive. (from 17th c.)
Usage examples of "prognosticatory".
The Lord Gavdat, who practices the study of magery, has remained behind as well, because he is in the midst of important prognosticatory calculations that he feels must not be interrupted even for so important a gathering as this.
In the end he came to a conclusion for he drew himself up, drained the prognosticatory glass of wine, and waited for an opportunity to speak.