noun

1. the quality of being hot; hotness: in physics, heat is considered a form of energy existing as the result of the random motion of molecules and is the form of energy that is transferred between bodies as a result of their temperature difference
2. 1. much hotness; great warmth stifling heat
   2. fever
3. degree of hotness or warmth at low heat
4. the perception of heat by the senses, resulting from contact with or nearness to something hot; sensation of hotness or warmth felt through the skin
5. hot weather or climate
6. the warming of a room, house, etc., as by a stove or furnace his rent includes heat
7. a burning sensation produced by spices, mustard, etc.
8. color or other appearance as an indication of hotness blue heat in metals
9. strong feeling or emotion; excitement, ardor, anger, zeal, etc.
10. the period or condition of excitement, intensity, stress, etc.; most violent or intense point or stage in the heat of battle
11. a single effort, round, bout, or trial; esp., any of the preliminary rounds of a race, etc., the winners of which compete in the final round
12. 1. sexual excitement
    2. the period of sexual excitement in animals; esp., the estrus of females
13. ☆ Slang
    1. coercion, as by intimidation
    2. great pressure, as in criminal investigation or law enforcement
    3. the police
    4. a pistol
14. Baseball, Slang pitches thrown with great velocity
15. Metallurgy
    1. a single heating of metal, ore, etc. in a furnace or forge
    2. the amount processed in a single heating

Etymology: ME hete < OE hætu < base of hat (see hot), akin to Ger heiss < IE base *kai-, heat

transitive verb, intransitive verb

1. to make or become warm or hot
2. to make or become excited; inflame or become inflamed