Dictionary definition · cool
noun
- the quality of being at a refreshingly low temperature"the cool of early morning"
- great coolness and composure under strain"keep your cool"
verb
- make cool or cooler"Chill the food"
- loose heat"The air cooled considerably after the thunderstorm"
- lose intensity"His enthusiasm cooled considerably"
adjective
- neither warm nor very cold; giving relief from heat"a cool autumn day"
- marked by calm self-control (especially in trying circumstances); unemotional"play it cool"
- inducing the impression of coolness; used especially of greens and blues and violets when referring to color"cool greens and blues and violets"
- psychologically cool and unenthusiastic; unfriendly or unresponsive or showing dislike"relations were cool and polite"
- being satisfactory or in satisfactory condition"an all-right movie"
- used of a quantity or amount (especially of money) for emphasis"a cool million bucks"
- fashionable and attractive at the time; often skilled or socially adept"he's a cool dude"
Source: Open English WordNet (CC BY 4.0).