warmth or the quality of being hot:
Ice needs heat to melt.
Insulating the attic is a good way to reduce heat loss.
very hot weather or a high temperature:
The heat was making them tired.
Angela liked to rest during the heat of the day (=the hottest part of the day).
Firefighters were beaten back by the intense heat.
the level of temperature used when cooking or heating something
in cooking[countable usually singular, uncountable]DFDH
(a) low/medium/high heat
Cook the chicken portions over a high heat.
turn off/down/up the heat
When the milk comes to the boil, turn off the heat.
Now reduce the heat and cover the pan.
strong feelings, especially anger or excitement:
Reconciliation services can take the heat out of (=reduce the anger in) the dispute.
strong pressure on someone:
The heat is on (=there is a lot of pressure) as schools struggle to finish their entries by the deadline.
The team turned up the heat (=used more effort against their opponents) in the last few minutes to score two more goals.
There was a lot of heat, and it affected our relationship.
the system in a house or other building that keeps it warm in the winter, or the warmth from this system [= heating British English]
system to heat building[uncountable] American EnglishDHTP
Can you turn up the heat?
a part of a race or competition whose winners then compete against each other in the next part:
in a race[countable]DS
Bill finished second in his heat.
8 British English in heat American EnglishHBADHP
if a female animal is on heat, her body is ready to have sex with a male