Source : Webster's Revised Unabridged Dictionary (1913)

Tepidity \Te*pid"i*ty\, n. [Cf. F. t['e]pidit['e].]
   The quality or state of being tepid; moderate warmth;
   lukewarmness; tepidness. --Jer. Taylor.

Source : WordNet®

tepidity
     n : a warmness resembling the temperature of the skin [syn: {lukewarmness},
          {tepidness}]