1.  hotness(n = noun.attribute) heat, high temperature - the presence of heat;
Antonym: coldness
Derived form adjective hot₁

2.  hotness(n = noun.state) horniness, hot pants - a state of sexual arousal;
Derived form adjective hot₅

3.  hotness(n = noun.attribute) pepperiness - a hot spiciness;
Derived form adjective hot₉

1.  The quality or state of being hot. [1913 Webster]

2.  Heat or excitement of mind or manner; violence; vehemence; impetuousity; ardor; fury. M. Arnold. [1913 Webster]