The act of heating or making warm; warmth or heat produced.
From Latin ex- (out) + calfacere (to heat, from calefacere). The 'cal' root connects to 'calor' (heat) and appears in modern words like 'calorie.'
This word shows how Latin built words for warmth—calfaction is buried in our modern word 'calorie,' which measures that very heat they were describing centuries ago.
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