Source : Webster's Revised Unabridged Dictionary (1913)

Calefaction \Cal`e*fac"tion\, n. [L. calefactio: cf. F.
   cal['e]faction.]
   1. The act of warming or heating; the production of heat in a
      body by the action of fire, or by communication of heat
      from other bodies.

   2. The state of being heated.

Source : WordNet®

calefaction
     n : the property of being warming [syn: {incalescence}]