1the quality of being hot; high temperature:the fierce heat of the sun
Physics heat seen as a form of energy arising from the random motion of the molecules of bodies, which may be transferred by conduction, convection, or radiation.
hot weather conditions:the oppressive heat was making both men sweat
a source or level of heat for cooking:remove from the heat and beat in the butter
a spicy quality in food that produces a burning sensation in the mouth:chilli peppers add taste and heat to food
technical the amount of heat that is needed to cause a specific process or is evolved in such a process:the heat of formation
[count noun] technical a single operation of heating something, especially metal in a furnace:about 100 tons is removed in each heat
2intensity of feeling, especially of anger or excitement:conciliation services are designed to take the heat out of disputes
(the heat) informal intensive and unwelcome pressure or criticism, especially from the authorities:a flurry of legal proceedings turned up the heat in the disputethe heat is on
3 [count noun] a preliminary round in a race or contest:winners of the regional heats
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Universal
make or become hot or warm: [with object]:the room faces north and is difficult to heat [no object]:the pipes expand as they heat up
[no object] (heat up) (of a person) become excited or impassioned:he seemed to calm down as quickly as he had heated up
[no object] (heat up) become more intense and exciting:the action really begins to heat up
[with object] archaic inflame; excite:this discourse had heated them
if you can't stand the heat, get out of the kitchen
proverb if you can’t deal with the pressures and difficulties of a situation, you should leave others to deal with it rather than complaining.
in the heat of the moment
while temporarily angry, excited, or engrossed, and without stopping for thought:things said in the heat of the moment
on (or North Americanin) heat
(of a female mammal) in the receptive period of the sexual cycle; in oestrus:the female is only on heat for a few days
