The noun heat has 7 senses (first 5 from tagged texts)
1. (42) heat, heat energy -- (a form of energy that is transferred by a difference in temperature)
2. (6) hotness, heat, high temperature -- (the presence of heat)
3. (5) heat, warmth -- (the sensation caused by heat energy)
4. (2) heat, warmth, passion -- (the trait of being intensely emotional)
5. (1) estrus, oestrus, heat, rut -- (applies to nonhuman mammals: a state or period of heightened sexual arousal and activity)
6. heat -- (a preliminary race in which the winner advances to a more important race)
7. heating system, heating plant, heating, heat -- (utility to warm a building; "the heating system wasn't working"; "they have radiant heating")
Overview of verb heat
The verb heat has 4 senses (first 1 from tagged texts)
1. (12) heat, heat up -- (make hot or hotter; "the sun heats the oceans"; "heat the water on the stove")
2. heat -- (provide with heat; "heat the house")
3. inflame, stir up, wake, ignite, heat, fire up -- (arouse or excite feelings and passions; "The ostentatious way of living of the rich ignites the hatred of the poor"; "The refugees' fate stirred up compassion around the world"; "Wake old feelings of hatred")
4. heat, hot up, heat up -- (gain heat or get hot; "The room heated up quickly")