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1550s, agent noun in Latin form from prognosticate.
early 15c., a back-formation from prognostication and also from Medieval Latin prognosticatus, past participle of prognosticare (see prognostication). Related: Prognosticated; prognosticating.
prognosticate prog·nos·ti·cate (prŏg-nŏs'tĭ-kāt')v. prog·nos·ti·cat·ed, prog·nos·ti·cat·ing, prog·nos·ti·cates To predict according to present indications or signs; foretell.