The act of disappearing or vanishing; the state of having disappeared.
From Latin disparitio, from disparire (to disappear), composed of dis- (apart) + parire (to appear). The word is extremely rare in modern English, surviving mainly in technical or archaic contexts.
In astronomy, 'disparition' is used for the moment when a celestial object disappears from view—it's the exact opposite and mirror image of 'apparition' (when something appears)!
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