Source : Webster's Revised Unabridged Dictionary (1913)

Hotness \Hot"ness\, n.
   1. The quality or state of being hot.

   2. Heat or excitement of mind or manner; violence; vehemence;
      impetuousity; ardor; fury. --M. Arnold.

Source : WordNet®

hotness
     n 1: the presence of heat [syn: {heat}, {high temperature}] [ant:
           {coldness}]
     2: a state of sexual arousal [syn: {horniness}, {hot pants}]
     3: a hot spiciness [syn: {pepperiness}]