The Collaborative International Dictionary of English v.0.48:

Warm \Warm\, v. t. [imp. & p. p. Warmed; p. pr. & vb. n.
   Warming.] [AS. wearmian. See Warm, a.]
   [1913 Webster]
   1. To communicate a moderate degree of heat to; to render
      warm; to supply or furnish heat to; as, a stove warms an
      apartment.
      [1913 Webster]

            Then shall it [an ash tree] be for a man to burn;
            for he will take thereof and warm himself. --Isa.
                                                  xliv 15
      [1913 Webster]

            Enough to warm, but not enough to burn.
                                                  --Longfellow.
      [1913 Webster]

   2. To make engaged or earnest; to interest; to engage; to
      excite ardor or zeal; to enliven.
      [1913 Webster]

            I formerly warmed my head with reading controversial
            writings.                             --Pope.
      [1913 Webster]

            Bright hopes, that erst bosom warmed. --Keble.
      [1913 Webster]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Warming \Warm"ing\,
   a. & n. from Warm, v.
   [1913 Webster]

   Warming pan, a long-handled covered pan into which live
      coals are put, -- used for warming beds. --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

warming
    adj 1: imparting heat; "a warming fire"
    2: producing the sensation of heat when applied to the body; "a
       mustard plaster is calefacient" [syn: calefacient,
       warming]
    n 1: the process of becoming warmer; a rising temperature [syn:
         heating, warming]
    2: warm weather following a freeze; snow and ice melt; "they
       welcomed the spring thaw" [syn: thaw, thawing, warming]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "warming":
   beating, burning, calefacient, calefaction, calefactive,
   calefactory, cauterant, chafing, cooking, debacle, defeasance,
   dielectric heating, drubbing, electric heating, electronic heating,
   furnace heating, gas heating, heat exchange, heating,
   hot-air heating, increase of temperature, induction heating,
   insolation, licking, oil heating, overthrow, panel heating,
   radiant heating, recalescence, rout, shellacking, steam heating,
   superheating, tepefaction, thrashing, torrefaction