To prognosticate means to predict something or at least hint at what will happen in the future. When a lot of natural disasters start happening close together, you might prognosticate that the world is ending, a prediction that's actually thousands of years old.

From the Latin prognosticāre, meaning "make a prediction," the verb prognosticate means to foretell or predict what is coming. While a fortuneteller or palm reader might claim special powers for seeing into the future, you can prognosticate by looking at real evidence and making a reasonable conclusion about how events will unfold. Sometimes, though, what you prognosticate from a dream or a fortune-cookie message ends up happening too, which is less reasonable but pretty neat — unless the world really does end.

Definitions of prognosticate

v make a prediction about; tell in advance

anticipate, call, forebode, foretell, predict, promise
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interpret the significance of, as of palms, tea leaves, intestines, the sky; also of human behavior
outguess, second-guess
attempt to anticipate or predict
predict from an omen
bet, wager
maintain with or as if with a bet
calculate, forecast
predict in advance
prophesy, vaticinate
predict or reveal through, or as if through, divine inspiration
divine by gazing into crystals
foretell through or as if through the power of prophecy
enlighten, irradiate
give spiritual insight to; in religion
Type of:
guess, hazard, pretend, venture
put forward, of a guess, in spite of possible refutation

v indicate by signs

augur, auspicate, betoken, bode, forecast, foreshadow, foretell, omen, portend, predict, prefigure, presage
to be a menacing indication of something:"The clouds threaten rain"
foretell by divine inspiration
Type of:
bespeak, betoken, indicate, point, signal
be a signal for or a symptom of

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