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.”