prognostic UK /pɹɒɡˈnɒstɪk/US /pɹɑɡˈnɑs.tɪk/noun 4adjective 1forms 3 noun4 •A sign by which a future event may be known or foretold.Careful observers may foretell the hour (By sure prognostics) when to dread a show’r. While rain depends, the pensive cat gives o’er Her frolics, and pursues her tail no more. — 1710 •A prediction of the future.The choice of a successor was no light matter. That choice would inevitably be considered by the country as a prognostic of the highest import. — 1849 •(rare) prognosisThere are several opinions as to what he meant But no one considers it a happy prognostic. — 1935 •One who predicts the future. adjective1 •Of, pertaining to or characterized by prognosis or prediction. formsprognostics · more prognostic · most prognostic