To make celestial or place among the stars; to elevate to heavenly status.
From Latin 'caelestis' (celestial) plus the suffix '-fy' or '-fication' (meaning to make). The word was formed on the model of other verbs like 'petrify' and 'mystify,' using this productive suffix.
Celestify is a word that almost nobody uses, but Renaissance scholars loved it—they imagined that great humans could be 'celestified' or elevated to the stars, turning classical hero-worship into something literally astronomical.
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