cool

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.

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.

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.