To heat or warm something; to make hot or to cause to become warm.
From Latin calefacere (to make hot), combining calere (to be hot) and facere (to make), with the English -fy suffix (meaning to make or cause to be).
This verb is incredibly rare in modern English, but it shows how the Latin root 'calere' (heat) appears in so many related words—creating a whole family of heating terms!
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