Read the dictionary definition of cool. All definitions for this word.
1. great coolness and composure under strain
1. keep your cool
2. the quality of being at a refreshingly low temperature
1. the cool of early morning
3. loose heat
1. The air cooled considerably after the thunderstorm
4. lose intensity
1. His enthusiasm cooled considerably
5. make cool or cooler
1. Chill the food
6. marked by calm self-control (especially in trying circumstances); unemotional
1. play it cool
2. keep cool
3. stayed coolheaded in the crisis
4. the most nerveless winner in the history of the tournament
7. fashionable and attractive at the time; often skilled or socially adept
1. he's a cool dude
2. that's cool
3. Mary's dress is really cool
4. it's not cool to arrive at a party too early
8. used of a quantity or amount (especially of money) for emphasis
1. a cool million bucks
9. being satisfactory or in satisfactory condition
1. an all-right movie
2. the passengers were shaken up but are all right
3. is everything all right?
4. everything's fine
5. things are okay
6. dinner and the movies had been fine
7. another minute I'd have been fine
10. neither warm nor very cold; giving relief from heat
1. a cool autumn day
2. a cool room
3. cool summer dresses
4. cool drinks
5. a cool breeze
11. psychologically cool and unenthusiastic; unfriendly or unresponsive or showing dislike
1. relations were cool and polite
2. a cool reception
3. cool to the idea of higher taxes
12. inducing the impression of coolness; used especially of greens and blues and violets when referring to color
1. cool greens and blues and violets
2. the cool sound of rushing water