augural

[L. auguralis.]
Of or pertaining to augurs or to augury; betokening; ominous; significant; as, an augural staff; augural books. «Portents augural.» Cowper.

adjective

Of or relating to the foretelling of events by or as if by supernatural means: divinitory, fatidic, fatidical, mantic, oracular, prophetic, sibylline, vatic, vatical, vaticinal, visionary. See foresight.