1. That which prognosticates; a sign by which a future event may be known or foretold; an indication; a sign or omen; hence, a foretelling; a prediction. That choice would inevitably be considered by the country as a prognostic of the highest import. (Macaulay)
Origin: L. Prognosticum, Gr., cf. F. Pronostic, prognostic. See Prognostic.