noun[mass noun] • rare
- The process of heating or warming.More example sentences
- Coal-oil-fired generators and atomic energy plants cause large amounts of waste heat which is carried away as hot water and cause thermal pollution or calefaction.
- The principal producers of calefaction are power plants.
- The calefaction point of water is 178°, and that of alcohol 128°.
late Middle English: from Old French, or from late Latin calefactio(n-), from calefacere 'make warm' (see calefacient).