D defs.my
Entry 2 senses Webster, 1913

Calefaction

· Cal·e·fac·tion · IPA /ˌkælɪˈfækʃən/
01 n. 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.
  1. 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. 2.
    The state of being heated.