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
  1. verb
    make a prediction about; tell in advance
    synonyms: 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, project
    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
  2. verb
    indicate by signs
    synonyms: augur, auspicate, betoken, bode, forecast, foreshadow, foretell, omen, portend, predict, prefigure, presage
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    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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