cool

noun

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

adjective

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

verb

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

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