cool

/kuːl/

noun

1
A moderate or refreshing state of cold; moderate temperature of the air between hot and cold; coolness.
“in the cool of the morning”
2
A calm temperament.
3
The property of being cool, popular or in fashion.

1
Having a slightly low temperature; mildly or pleasantly cold.
2
Allowing or suggesting heat relief.
“Linen has made cool and breathable clothing for millennia.”
3
Of a color, in the range of violet to green.
“If you have a reddish complexion, you should mainly wear cool colors.”
4
Of a person, not showing emotion; calm and in control of oneself.
5
Unenthusiastic, lukewarm, skeptical.
“His proposals had a cool reception.”
6
Calmly audacious.
“In control as always, he came up with a cool plan.”
7
Applied facetiously to a sum of money, commonly as if to give emphasis to the largeness of the amount.
8
Of a person, knowing what to do and how to behave; considered popular by others.
9
In fashion, part of or fitting the in crowd; originally hipster slang.
10
Of an action, all right; acceptable; that does not present a problem.
“Is it cool if I sleep here tonight?”
11
Of a person, not upset by circumstances that might ordinarily be upsetting.
“I'm completely cool with my girlfriend leaving me.”
12
Quietly impudent, defiant, or selfish; deliberately presuming: said of persons and acts.

1
To lose heat, to get colder.
“I like to let my tea cool before drinking it so I don't burn my tongue.”
2
To make cooler, less warm.
3
To become less intense, e.g. less amicable or passionate.
“Relations cooled between the USA and the USSR after 1980.”
4
To make less intense, e.g. less amicable or passionate.
5
To kill.

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